Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

The countries of Southeast Asia are projected to experience severe flood damage and economic impacts from climate change, compared with the global average. Hence adaptation by incorporating infrastructures is essential, but it has been seldom explicitly included in the simulations projecting climate change impacts on flood risk in these countries. Quantifying the effects of infrastructure is the key to climate change impact and adaptation assessment. Therefore, this study was conducted in the Chao Phraya River Basin (CPRB) in Thailand to examine the adaptation potential of (i) existing structural and non-structural measures that include reservoir and diversion dams, diversion canals, and water retention areas, and (ii) the combined adaptation measures, a combination of alterations made to the existing diversion canals and retention areas, on reducing future floods using the H08 global hydrological model (GHM). The results revealed that the impact of existing measures on the future flood reduction was smaller than the increase caused by warming in the CPRB. Conversely, the combined adaptation measures successfully mitigated the effect of warming by redirecting nearly 50 % of the diverted river flow to the ocean and storing 30 % of the diverted flow in the retention areas. Although a remarkable reduction was noted in the basin-wide flood risk, the effect of adaptation measures greatly varied across the basin. The combined adaptation measures largely reduced the number of flooding days by close to 100 at many of the considered stations within the basin, except for extreme flood events (historical 1 percentile flood events). This further reveals that the feasibility of adaptation measures in alleviating the extreme future floods will be limited in flood-vulnerable basins and thus require area-based prioritization for flood management. The modelling framework implemented in this study can be easily adapted to different GHMs and regions and should be examined for their applicability.

DOI： 10.1016/j.scitotenv.2022.156742

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：COPERNICUS GESELLSCHAFT MBH  

Water diversion systems play crucial roles in assuaging flood risk by diverting and redistributing water within and among basins. For flood and drought assessments, including investigations of the effects of diversion systems on river discharge worldwide, the explicit inclusion of these systems into global hydrological models (GHMs) is essential. However, such representation remains in the pioneering stage because of complex canal operations and insufficient data. Therefore, we developed a regionalized canal operation scheme and implemented it in the H08 GHM for flood diversion in the Chao Phraya River basin (CPRB), Thailand, which is a complex river network with several natural and artificial diversion canals and has been subject to severe flooding in the past, including recent years.Region-specific validation results revealed that the enhanced H08 model with the regionalized diversion scheme could effectively simulate the observed flood diversion pattern in the CPRB. Diverted water comprises approximately 49 % of the annual average river discharge in the CPRB. The simulations further confirmed that the presented canal scheme had the potential to reduce flood risk in the basin by significantly reducing the number of flooding days. A generalized canal scheme with simple input data settings was also constructed for future global applications, providing insights into the maximum level of discharge reduction achievable with diversion of nearly 57 % of the annual average river discharge of the CPRB. Overall, the enhanced H08 model with canal schemes can be adapted and applied to different contexts and regions, accounting for the characteristics of each river network by maintaining the basic principles unaltered.

DOI： 10.5194/hess-26-2541-2022

Web of Science

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Hydrology and Water Resources  

Identifying the complex patterns of human-flood interactions over longer periods of time is very important in floodplain management activities. The recently introduced socio-hydrology (SH) model contributes to capture these long-term behaviors of human-flood systems. This model can be utilized to explain the long-term dynamics of human-water interaction in floodplains. The current SH model exclusively illustrates the impact of river floods on floodplain communities. However, in some river basins, urban floods (due to high intensity rainfall) are dominant, whereas in other river basins, both river floods and urban floods influence the dynamics of the system. It is often difficult to distinguish the type of flood from actual local disaster data sets. In this study, we proposed an improvement to the existing SH model to capture the dynamics of both river floods and urban floods based on a case study from the Lower Kelani Basin, Sri Lanka, using simulated historical flood damages. The improved model was applied to capture flood damages in the target watershed, and the results further emphasize the importance of flood risk perception in flood damage reduction.

DOI： 10.3178/hrl.16.40

Web of Science

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Hydrology and Water Resources  

DOI： 10.3178/jjshwr.35.122

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Rapid urbanization, tourism, and climate change (CC) threaten water resource management in developing countries. Conventional water-planning tools cannot account for the changing effects of water disparity, climate risks, and environmental flow (EF) requirements. This paper proposes an alternative approach that applies stylized water-demand forecasting and predicting water availability from the perspectives of CC, changing society, and EF, thereby providing managers with future scenarios of surface water sufficiency/deficiency in an active ecotourism area, namely, Puerto Princesa City, Philippines. We considered (1) scenarios of seasonal droughts to prepare for climate risks in the future and (2) scenarios of water availability that do not depend on groundwater supply, in which the projected water deficiency is frequent both annually and seasonally. The results of this case study showed that an additional water supply from the Montible Watershed to the city was projected to secure sufficient amounts of water to achieve surface-water sufficiency, which is consistent with the goals of both the municipality and the water company to reduce the dependency on groundwater. Moreover, significant infrastructure investment costs must be anticipated in Scenario 3. Our approach proves efficient in modeling water demand in regions with active tourism and hydrology and therefore has the potential for further analyses and application.

DOI： 10.3390/su13094826

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

Abstract

Thailand plays a central economic and policy-making role in Southeast Asia. Although climate change adaptation is being mainstreamed in Thailand, a well-organized overview of the impacts of climate change and potential adaptation measures has been unavailable to date. Here we present a comprehensive review of climate-change impact studies that focused on the Thai water sector, based on a literature review of six sub-sectors: riverine hydrology, sediment erosion, coastal erosion, forest hydrology, agricultural hydrology, and urban hydrology. Our review examined the long-term availability of observational data, historical changes, projected changes in key variables, and the availability of economic assessments and their implications for adaptation actions. Although some basic hydrometeorological variables have been well monitored, specific historical changes due to climate change have seldom been detected. Furthermore, although numerous future projections have been proposed, the likely changes due to climate change remain unclear due to a general lack of systematic multi-model and multi-scenario assessments and limited spatiotemporal coverage of the study area. Several gaps in the research were identified, and ten research recommendations are presented. While the information contained herein contributes to state-of-the-art knowledge on the impact of climate change on the water sector in Thailand, it will also benefit other countries on the Indochina Peninsula with a similar climate.

DOI： 10.1088/1748-9326/abce80

Web of Science

Scopus

Other Link： https://iopscience.iop.org/article/10.1088/1748-9326/abce80/pdf

Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Long-term records of flood damages are important for studying flood countermeasures and predicting future flood damages. Although the best record of flood damages in Japan is the Flood Statistics Survey started in 1961, there are no long-term statistics which record the magnitude, scale, area, and factors of flood before the survey. In this study, we developed a database on flood damages from 1900 to 1965 with using the flood records prepared by the local meteorological stations and others. This database is the most detailed and long-term records related flood damages in Japan. The results of the database analysis show that major flood events occurred between 1941 and 1945, which have not been recorded in the previous records, and the frequency and intensity of flood events have clearly increased since 1950s.

DOI： 10.2208/jscejhe.77.1_74

Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.2208/jscejhe.76.1_202

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.2208/jscejhe.76.1_424

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This study examined the evacuation behavior of two communities in Nagano City; Naganuma and Toyono, Japan, during the typhoon Hagibis. Despite the width of the inundated area and significant building damage, there were only two victims in the area. We analyzed the relationship between (1) the numerical statement of the aggregated evacuation behavior, (2) social and hazard circumstances, and (3) social background, including the disaster preparedness formulated by the community. The research focused on “the minutia” of factors which have been revealed by previous researches, rather than “the existence or absence” of such factors. The analysis was based on newspaper articles, a post-interview survey conducted by Kansai Television Co. Ltd., the minutes of the flooded area’s past flood control meetings, and community disaster management plans. The results showed that the main factor promoting evacuation action differed in the two communities. This difference lied in each community’s disaster preparedness. Indeed, Naganuma had set a specific and socially agreed upon criterion for evacuation: a specific water level of the Chikuma River. Meanwhile, Toyono had experienced several inland flooding. On the other side, both communities had participated in the flood control meetings and formed organizations for voluntary disaster mitigation action and a common awareness of “what constitutes a dangerous situation” and “which information is important for the evacuation”.

DOI： 10.2208/jscejhe.76.1_424

Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Land use regulation is positioned in flood mitigation and climate change adaptation measures as a fundamental measure to reduce the amount of exposure in floodplain. In Japan, land use regulation for flood mitigation has been considered in the area classification under the City Planning Act and the Location Normalization Plan under the Act on Special Measures concerning Urban Reconstruction. However, its actual mitigation effects and operational challenges have not been fully clarified. In this study, we analyzed the characteristics of flood damages in the urbanization control area in Naganuma District of Nagano City, where was severely damaged by the levee breaking of the Chikuma River caused by the Typhoon Hagibis in 2019. The analysis using the building point data revealed that land use regulation by the area classification played a role to reduce the damages in the area. However, in the community level, it was confirmed that more buildings have been located in the high flood hazards area due to the development of new houses and businesses associated with the development of infrastructures.

DOI： 10.2208/jscejhe.76.1_202

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER INTERNATIONAL PUBLISHING AG  

Flooding in urban areas is an inevitable problem for many cities in the world. In Thailand, Bangkok has serious problems related to urban flooding. The situation was highlighted in May 2017, when residences experienced ankle to knee-deep flood water on the streets. Daily activities in parts of the city were nearly paralyzed and heavy traffic jams occurred due to stagnant water on the streets. The study has depended on a combined approach of physically based modeling and GIS. The urban drainage is structured by iRIC software for the basis of two networks, one simulating the two-dimension free-surface flow over the streets and one for the pumping/canal/pipe system. The interaction between street and pumping/canal/pipe system is modeled in a simple way. In 2017, ADAP-T project carried out a pilot study about urban flooding and adaptation modeling for Sukhumvit area, Bangkok Metropolitan. This study is performed as an extension and improvement of pilot study in terms of analyzing drainage system on effect of flood hazard, vulnerability, risk map and adaptation under the issue of climate change in Sukhumvit area, Bangkok, together with suggestion of alleviation scenarios to relieve flood problems.

DOI： 10.1007/978-3-319-99867-1_111

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.2208/jscejhe.75.1_299

Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.2208/jscejhe.75.2_I_67

Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.2208/jscejhe.75.2_I_43

Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejhe.75.1_299

Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejhe.75.2_i_43

CiNii Books

Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejhe.75.2_i_67

CiNii Books

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejaie.74.94

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese  

Language：Japanese  

Language：English  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

CiNii Books

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

CiNii Books

Language：Japanese   Publishing type：Research paper (other academic)  

Language：English   Publishing type：Research paper (other academic)  

Language：Japanese  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：COPERNICUS GESELLSCHAFT MBH  

The assessment of flood risk is important for policymakers to evaluate damage and for disaster preparation. Large population densities and high property concentration make cities more vulnerable to floods and having higher absolute damage per year. A number of major cities in the world suffer from flood inundation damage every year. In Japan, approximately USD 1 billion in damage occurs annually due to pluvial floods only. The amount of damage was typically large in large cities, but regions with lower population density tended to have more damage per capita. Our statistical approach gives the probability of damage following every daily rainfall event and thereby the annual damage as a function of rainfall, population density, topographical slope and gross domestic product. Our results for Japan show reasonable agreement with area-averaged annual damage for the period 1993-2009. We report a damage occurrence probability function and a damage cost function for pluvial flood damage, which makes this method flexible for use in future scenarios and also capable of being expanded to different regions.

DOI： 10.5194/nhess-16-1063-2016

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

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DOI： 10.11520/jshwr.29.0_32

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

This study aims to develop a new approach to assess the impact of climate change on the small oceanic islands in the Pacific. We developed a new index “RAKUEN” to assess the sustainability in these regions. The RAKUEN index focuses on the relationship among tourism, local society and environment. It is important to project the change of RAKUEN index considering the climate change. Hence, we focused on the impact of climate change on tourism in this presentation. The result indicated that the strength of extreme events would be increased, whereas the probability of occurrence would be decreased. This change should result in increase of the number of clear days and it could contribute to improve the tourist satisfaction.

DOI： 10.11520/jshwr.29.0_61

Language：Japanese   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese  

Authorship：Lead author   Language：Japanese  

Authorship：Lead author   Language：Japanese  

Language：Japanese  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (other academic)   Publisher：土木学会  

CiNii Books

Language：Japanese   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 1489-1494

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

In this working group, we had several times of workshops with young researchers from forest hydrology, agricultural engineering, and river engineering discipline, focusing on “how flood control plan should be.” We discussed “how to grasp the hilly and mountainous area in hydrology,” focusing on the role of the hilly and mountainous area in the whole basin and the relationship between the hilly and mountainous area and the downstream cities. And thinking of the foregoing study on the characteristics of the topography where the flood-prone area distributes, we discussed “do people living in flood-prone area suffer from food?” in terms of today’s situation and the future prospect.

DOI： 10.11520/jshwr.27.0_100050

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

In Japan, safety degree against flood is said to have increased by river improvement. However, frequently flooded areas still exist. This means that frequently flooded areas has some characteristics which prevent river improvement. Therefore it is important to clarify the distribution and characteristics of frequently flooded areas for thinking about future river improvement plans.<br>In this research, we clarified the distribution of frequently flooded areas in Japan, using flooded area maps. As a result, it is clarified that most frequently flooded areas exist in narrow valley plains, and the reason why such areas are still flooded is difficulty of embankment.

DOI： 10.2208/jscejhe.70.I_1489

Other Link： https://jlc.jst.go.jp/DN/JLC/20010508686?from=CiNii

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

To address many of the problems faced in hydrological engineering planning, design, and management, a detailed knowledge of flood event characteristics, such as flood peak, volume, and duration is required. Flood frequency analysis often focuses on flood peak values and provides a limited assessment of flood events. To develop effective flood management and mitigation policies, estimation of the scale of potential disasters, incorporating the effects of social factors and climate conditions, is required along with quantitative measures of flood frequency. The Japanese flood risk index, the flood disaster occurrence probability (FDOP), was established based on both natural and social factors. It represents the expectation of damage in the case of a single flood occurrence, which is estimated by integrating a physical-based approach as a Total Runoff Integrating Pathways (TRIP) model with Gumbel distribution metrics. The resulting equations are used to predict potential flood damage based on gridded Japanese data for independent variables. This approach is novel in that it targets floods based on units of events instead of a long-term trend. Moreover, the FDOP can express relative potential flood risk while considering flood damage. The significance of the present study is that both the hazard parameters (which contribute directly to flood occurrence) and vulnerability parameters (which reflect conditions of the region where the flood occurred), including residential and social characteristics, were shown quantitatively to affect flood damage. This study examined the probability of flood disaster occurrence using the TRIP model for Japan (J-TRIP), a river routing scheme that provides a digital river network covering Japan. The analysis was based on floods from 1976 to 2004 associated with flood inundation and sediment disasters. Based on these results, we estimated the probability of flood damage officially reported for the whole region of Japan at a grid interval of 0.1 degrees. The relationship between the magnitude of the rain hazard expressed as the probability of exceedance and the probability of flood damage officially reported was expressed as an exponential function by equalizing the whole region of Japan based on excess probability. Moreover, the probabilities of flood damage occurrence according to social factors and changes in climate conditions were also examined. The probability of flood damage occurrence is high, especially in regions of high population density. The results

DOI： 10.1016/j.ijdrr.2012.11.003

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 432-446

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 115-126

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Fuji Technology Press  

This research focuses on dam reservoir operation effective in flood mitigation and water resource reservation on a seasonal scale. Based on the relationship between discharge characteristics in the upper watershed of Chao Phraya River and flood occurrences in the lower watershed, it was clarified that the dam reservoir operation most effective in the rainy season was determining the lowest reservoir volume in August for the Sirikit Dam reservoir and in July for the Bhumibol Dam reservoir, and storing water until November. Furthermore, by the probability evaluation on the free reservoir capacities of both dams estimated from the predetermined lowest reservoir volume and inflow volume in both dams, the dam reservoir operation considering the importance of flood mitigation and water resource reservation on a seasonal scale can be achieved.

DOI： 10.20965/jdr.2013.p0432

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

J-GLOBAL

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： I_1453-I_1458

Language：Japanese   Publisher：Japan Society on Water Environment  

A massive flood struck the Chao Phraya River Basin in Thailand from August to December in 2011. The total flood volume was estimated to be 15 billion m<SUP>3</SUP>, and the area of damaged agricultural land was as large as the Kanto Plain. To understand the planar and temporal characteristics of water quality of floodwater along with the flow, the authors conducted a field survey of the flood from Chai Nat, Ayutthaya to Bangkok in November and December. The results show that some indices were higher in the southern area from Ayutthaya and that the effect of the first flash was observed in an area where inundation had started a few days earlier in Bangkok. E. coli was detected in the Chao Phraya River in inundated Ayutthaya in November, suggesting that human excrement flowed into floodwater. However, it was not detected in December there, suggesting that the inflow of human excrement stopped owing to the extinction of the inundated area.

DOI： 10.2965/jswe.35.187

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

A massive flood, the maximum ever recorded in Thailand, struck the Chao Phraya River in 2011. The total rainfall during the 2011 rainy season was 1,439 mm, which was 143% of the average rainy season rainfall during the period 1982–2002. Although the gigantic Bhumipol and Sirikit dams stored approximately 10 billion m³ by early October, the total flood volume was estimated to be 15 billion m³. This flood caused tremendous damage, including 813 dead nationwide, seven industrial estates, and 804 companies with inundation damage, and total losses estimated at 1.36 trillion baht (approximately 3.5 trillion yen).<br> The Chao Phraya River watershed has experienced many floods in the past, and floods on the same scale as the 2011 flood are expected to occur in the future. Therefore, to prepare of the next flood disaster, it is essential to understand the characteristics of the 2011 Chao Phraya River Flood. This paper proposes countermeasures for preventing major flood damage in the future.<br>

DOI： 10.3178/hrl.6.41

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： I_685-I_690

Publishing type：Research paper (international conference proceedings)  

The transport of the sediment, carried in suspension by water, is central to hydrology and the ecological functioning of river floodplains and deltas. River discharge estimation is useful for demonstrating this information. In this study, we extracted MODIS reflectance values from a pixel near the river mouth after carrying out the simple atmospheric correction method, then applied single regression analysis to reflectance values and the in situ discharge of Monobe River in Kochi prefecture, Japan. MODIS images and in situ data were taken from January through December, 2004. As a result, Monobe River, robustly positive relationships between the discharges observed in situ and remotely sensed MODIS reflectance data in the region of river mouth were found throughout the year. In addition, we estimated the monthly discharge from the MODIS reflectance with the regression formula. As a result, in situ average discharge was well estimated. In the near future, we will apply the proposed method to Mun river in Thai land.

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese

Total pages：xxii, 726p, 図版 [4] p   Language：Japanese

CiNii Books

Total pages：vi, 195p   Language：Japanese

CiNii Books

Responsible for pages：000   Language：Japanese Book type：Dictionary, encyclopedia

Responsible for pages：109-120   Language：Japanese Book type：General book, introductory book for general audience

Responsible for pages：16-17, 42-43, 70-71   Language：Japanese

Responsible for pages：31-39   Language：English

Total pages：vi, 207p   Language：Japanese

CiNii Books

Responsible for pages：1-112   Language：Japanese

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

DOI： 10.11520/jshwr.34.0_146

J-GLOBAL

CiNii Books

Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18K13836/

Language：Japanese   Publisher：Japan Society of Material Cycles and Waste Management  

DOI： 10.14912/jsmcwm.31.0_105

Language：Japanese  

CiNii Books

J-GLOBAL

J-GLOBAL

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

DOI： 10.11520/jshwr.32.0_88

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

DOI： 10.11520/jshwr.32.0_54

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

DOI： 10.11520/jshwr.31.0_52

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.  

Language：English   Publishing type：Research paper, summary (national, other academic conference)  

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

CiNii Books

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

The long-term effect of flood by typhoon No. 9 2009 in Sayo, Hyogo are investigated. Generally, the long-term influence of flood in mountainous region in Japan has not been studied well. It is important to consider such influence because the impact of flood could be catastrophic for those areas where depopulation is significantly on going. The effects are estimated by statistical analysis of social indices, questionnaire survey, and interviews for local government and communities. The results indicate that the influence of flood was substantially lower than other influence of changes such as depopulation or population aging.

DOI： 10.11520/jshwr.30.0_20

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

Interdisciplinary approaches are necessary to solve issues in hilly and mountainous area since the impact of depopulation as well as climate change is important in those areas. A research group which is composed of members from various research filed aims to study those issues with local government and communities. The group conducted three topics; 1) the investigation about long-term impact of flood; 2) the investigation of land-use change in the frequently flooded area; 3) the workshop about small ponds for agriculture. While the discussion is still on going, we found some important keywords which would be the core of our future activities.

DOI： 10.11520/jshwr.30.0_33

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：土木学会  

CiNii Books

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

CiNii Books

Language：Japanese  

CiNii Books

Language：English   Publisher：COPERNICUS GESELLSCHAFT MBH  

The assessment of flood risk is important for policymakers to evaluate damage and for disaster preparation. Large population densities and high property concentration make cities more vulnerable to floods and having higher absolute damage per year. A number of major cities in the world suffer from flood inundation damage every year. In Japan, approximately USD 1 billion in damage occurs annually due to pluvial floods only. The amount of damage was typically large in large cities, but regions with lower population density tended to have more damage per capita. Our statistical approach gives the probability of damage following every daily rainfall event and thereby the annual damage as a function of rainfall, population density, topographical slope and gross domestic product. Our results for Japan show reasonable agreement with area-averaged annual damage for the period 1993-2009. We report a damage occurrence probability function and a damage cost function for pluvial flood damage, which makes this method flexible for use in future scenarios and also capable of being expanded to different regions.

DOI： 10.5194/nhess-16-1063-2016

Web of Science

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

Semi-mountainous area has gathered attention in recent years because of the multiple functions in the area: a variety of food supply, biodiversity conservation, providing employment opportunities, disaster mitigation etc. However, Semi-mountainous area is facing aging society, population decline based on the specific economic and social conditions in these areas. According to previous studies, if the situation continue in this area, the existence of area itself faces difficulty surviving. On these background, our study group, which consist of young researchers in the fields of hydrology, agricultural engineering and river engineering, is discussing about the vision of flood prevention in semi-mountainous area. Our past activities were 10 times study meeting and the research excursion in Sayo-town (Hyogo Prefecture): suffered a sever damage from a great flood in 2009. Based on these activities, our group started a new research theme: &ldquo;Impact assessment of flood disaster on the semi-mountainous area decline -In case of Sayo town, Hyogo.-&ldquo;.

DOI： 10.11520/jshwr.28.0_100134

Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.  

Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：Japan Society of Civil Engineers  

In Japan, safety degree against flood is said to have increased by river improvement. However, frequently flooded areas still exist. This means that frequently flooded areas has some characteristics which prevent river improvement. Therefore it is important to clarify the distribution and characteristics of frequently flooded areas for thinking about future river improvement plans.<br>In this research, we clarified the distribution of frequently flooded areas in Japan, using flooded area maps. As a result, it is clarified that most frequently flooded areas exist in narrow valley plains, and the reason why such areas are still flooded is difficulty of embankment.

DOI： 10.2208/jscejhe.70.I_1489

Other Link： https://jlc.jst.go.jp/DN/JLC/20010508686?from=CiNii

Language：Japanese   Publisher：土木学会  

CiNii Books

J-GLOBAL

Language：English   Publisher：Elsevier Ltd  

To address many of the problems faced in hydrological engineering planning, design, and management, a detailed knowledge of flood event characteristics, such as flood peak, volume, and duration is required. Flood frequency analysis often focuses on flood peak values and provides a limited assessment of flood events. To develop effective flood management and mitigation policies, estimation of the scale of potential disasters, incorporating the effects of social factors and climate conditions, is required along with quantitative measures of flood frequency. The Japanese flood risk index, the flood disaster occurrence probability (FDOP), was established based on both natural and social factors. It represents the expectation of damage in the case of a single flood occurrence, which is estimated by integrating a physical-based approach as a Total Runoff Integrating Pathways (TRIP) model with Gumbel distribution metrics. The resulting equations are used to predict potential flood damage based on gridded Japanese data for independent variables. This approach is novel in that it targets floods based on units of events instead of a long-term trend. Moreover, the FDOP can express relative potential flood risk while considering flood damage. The significance of the present study is that both the hazard parameters (which contribute directly to flood occurrence) and vulnerability parameters (which reflect conditions of the region where the flood occurred), including residential and social characteristics, were shown quantitatively to affect flood damage. This study examined the probability of flood disaster occurrence using the TRIP model for Japan (J-TRIP), a river routing scheme that provides a digital river network covering Japan. The analysis was based on floods from 1976 to 2004 associated with flood inundation and sediment disasters. Based on these results, we estimated the probability of flood damage officially reported for the whole region of Japan at a grid interval of 0.1 degrees. The relationship between the magnitude of the rain hazard expressed as the probability of exceedance and the probability of flood damage officially reported was expressed as an exponential function by equalizing the whole region of Japan based on excess probability. Moreover, the probabilities of flood damage occurrence according to social factors and changes in climate conditions were also examined. The probability of flood damage occurrence is high, especially in regions of high population density. The results also showed the effect of the dam maintenance ratio on extreme flooding and flood damage frequency. The probability of flood damage occurrence was expected to increase during extreme weather events at the end of this century. These findings provide a sound foundation for use in catchment water resources management. © 2012 Elsevier Ltd.

DOI： 10.1016/j.ijdrr.2012.11.003

Web of Science

Scopus

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：Fuji Technology Press  

This research focuses on dam reservoir operation effective in flood mitigation and water resource reservation on a seasonal scale. Based on the relationship between discharge characteristics in the upper watershed of Chao Phraya River and flood occurrences in the lower watershed, it was clarified that the dam reservoir operation most effective in the rainy season was determining the lowest reservoir volume in August for the Sirikit Dam reservoir and in July for the Bhumibol Dam reservoir, and storing water until November. Furthermore, by the probability evaluation on the free reservoir capacities of both dams estimated from the predetermined lowest reservoir volume and inflow volume in both dams, the dam reservoir operation considering the importance of flood mitigation and water resource reservation on a seasonal scale can be achieved.

DOI： 10.20965/jdr.2013.p0432

Scopus

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

J-GLOBAL

Language：Japanese  

CiNii Books

J-GLOBAL

J-GLOBAL

J-GLOBAL

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

J-GLOBAL

Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

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