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

DOI： https://doi.org/10.1007/s11600-023-01075-8

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

DOI： https://doi.org/10.1016/j.geomorph.2022.108562

Authorship：Last author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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

DOI： 10.1002/esp.5469

DOI： 10.1002/esp.5469

Web of Science

Other Link： https://doi.org/10.1002/esp.5469

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

DOI： https://doi.org/10.11532/hydrometry.1.0_10

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

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

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)  

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

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

DOI： 10.1061/(ASCE)BE.1943-5592.0001905

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

DOI： 10.3389/frwa.2021.700946

Web of Science

Other Link： https://doi.org/10.3389/frwa.2021.700946

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

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

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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

DOI： 10.1088/1361-6501/ab85d5

Web of Science

Other Link： https://doi.org/10.1088/1361-6501/ab85d5

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

Authorship：Lead author   Language：Japanese  

Authorship：Lead author   Language：Japanese  

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

DOI： 10.1080/23249676.2018.1497559

Web of Science

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

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

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

DOI： 10.1007/s11629-018-4848-y

Web of Science

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

DOI： 10.1007/s00348-018-2551-y

Web of Science

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

Language：Japanese  

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

DOI： 10.1002/2017WR021913

Web of Science

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

DOI： 10.1007/s11069-017-2789-3

Web of Science

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

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

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

DOI： 10.1002/2016WR019726

Web of Science

Publishing type：Research paper (scientific journal)  

DOI： 10.1002/2015WR018354

Research data storage URL： http://orcid.org/0000-0003-2895-8221

Publishing type：Research paper (scientific journal)  

DOI： 10.5194/nhess-16-2455-2016

Research data storage URL： http://orcid.org/0000-0003-2895-8221

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

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

 A procedure for estimating flood damage to buildings, roads, and railways located in mountainous flood-plains due to probable maximum precipitation events is proposed. Probable maximum precipitation and consequent flood are estimated using the method proposed by Kadoya and Nagamori, 1979. For case study simulations, two areas, both located in the Chugoku District and damaged by recent large flood events, are selected. The characteristics of inundation flow in two areas under flood conditions caused by probable maximum precipitation are estimated using a two-dimensional flow model with fine-resolution calculation grids. Damage to humans and structures caused by probable maximum flood events is estimated based on the relationship between recorded damage due to recent large floods and inundation flow characteristics estimated using our numerical model. Effective measures to increase resilience in communities in mountainous regions are also discussed.

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

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

This paper describes a method of measuring flow rate and size distribution of sediment transported in gravel-bed river during small flood. The device developed is inexpensive, compact and can be installed in the river bed by hand. A steel shell covers the device and impact sound when sediment hits the steel shell is recorded by a digital sound recorder stored in the steel shell. The relationship between sound wave profile and a diameter of the impinged sediment particle was validated based on the result of flume experiment. The proposed method was used to measure processes of sediment transport during a flushing flow released from a dam, then the size distribution and amount of bed-load were successfully analyzed.

Measurements have been carried out to clarify the effects of the tree belts along the edges of roughened floodplains on the flow field. A meandering main channel having 0.87 m width and 0.040 m depth with a wavelength of 3.64 m is located along the center of a straight flume, which is 21.8 m long and 2.2 m wide. Flows in a compound channel with three different vegetation layout are measured at the same flow rate: (i) no tree along the floodplain edges, (ii) trees along the half of the floodplain edges, (iii) trees along all the floodplain edges. Measurement has shown that spiral motions are present in the main channel with/without tree belts and that the regions of high primary velocity is concentrated in the main channel over the depth. The tree belts are found to significantly increase the water level, hence decrease the magnitude of primary velocity over the entire channel while they produce small change in velocity distribution, indicating that the flow pattern in the main channel under high water condition is strongly affected by the geometry of the meandering main channel and not by the tree belts along the floodplain edges. © 2014 Taylor & Francis Group, London.

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

In this paper, an inundation .ow in the Matsugase district, Sanyo-Onoda City, during the 2010 July torrential rainfall event was analyzed. Topographical data of this area were measured by aerial LiDAR survey. The DEM obtained by the LiDAR survey was veri.ed by .eld survey data measured by RTK-GPS. A shock-capturing shallow water .ow model with a .ne calculation grid (two to 5 meters in resolution) was utilized to represent inundation .ow in the inundated area. The calculated water depth was compared with the water records. The characteristics of inundation .ow, especially the e.ect of the embankments in the inundated area, and those relation to local damage were discussed. E.ects of embankment rise and reduction of energy loss due to a bridge were evaluated.

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

With the increase of extreme climate events due to the global climate change, urban areas have been becoming more prone to flooding. This trend highlights the importance of effective schemes to mitigate the damage and loss due to inundation. The advancement of numerical prediction method for heavy rainfall is a key technology for early warning. The objectives of this study are twofold. One is to clarify the applicability of the combination of WRF (Weather and Research Forecasting) model and a data assimilation method LETKF (Local Ensemble Transform Kalman Filter). The other is to discuss the evolution of rainfall system that caused heavy rainfall based on the numerical results. We carried out numerical simulation of heavy rainfall in western Shimane prefecture in August, 2013. Comparison between the calculated results and those measured by a radar-AMeDAS shows that the numerical results fail to reproduce the intensity and the location of the heavy rainfall with small success during the latter half of the rainfall event. It is found that the ensemble mean rainfall provides a slightly better results about the peak value and peak time of rainfall compared to those by the deterministic approach without assimilation, showing the effectiveness of LETKF. The heavy rainfall event over Shimane prefecture is considered to have occurred by the southwest moisture flux converge near the front with the orographic effect of the Chugoku distract.

Publishing type：Research paper (scientific journal)  

In the afternoon of 28 July 2008, a flash flood occurred in the water-friendly reach of the Toga River in Kobe City, tragically drowning five people that included three children. They were among about 50 people enjoying the river environment. The flash flood was caused by sudden localized torrential rain in urbanized area of the small river basin. The onset of the flash flood was captured by a river monitoring camera as consecutive still images, while the surface flow just after the peak flow was videotaped by a TV cameraman without using a tripod. In order to estimate the peak discharge of the flash flood, the space-time image velocimetry technique developed by the authors was applied to the video images after applying image stabilization. The estimated discharge was used as an input hydraulic parameter of the 2D numerical simulation, with a success of reproducing the transient flow pattern observed by the monitoring camera. In addition, the distribution of hydrodynamic force the people in the river were exposed to was calculated to reveal the difficulty of evacuation in flash flood condition, even when the depth of water is less than knee high. © Institution of Engineers Australia, 2013.

DOI： 10.7158/W12-011.2013.16.2

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

DOI： 10.1016/j.jhydrol.2013.01.042

Web of Science

Language：English  

Web of Science

Language：English  

Web of Science

Language：English  

Web of Science

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

Abnormal growth of submerged plants in rivers not only interferes with fishery and navigation but also blocks sunlight from arriving at river bed materials, leading to the growth failure of attached algae that living creatures there are fed on. It is important for river engineers to clarify how submerged plans can grow and be washed out because they can propagate in such a way that their lobed leaves survive in downstream reaches. This study aims at making clear the conditions how some submerge plant is washed away by the floods. The field surveys were conducted before and after an artificial flood from reservoir to measure the distribution of Egeria densa and to quantify its wash-out rate through cross-sections. These results have revealed the wash-out condition of the submerged plant.

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

To evaluate the detachment process of attached algae in rivers, a series of flume experiments were carried out. Time-series analysis of NDVI (Normalized Difference Vegetation Index) image of cobbles covered by attached algae was conducted to estimate the change in Chl-a or the decrease in attached algae density. A new method to convert NDVI to Chl-a was developed to measure the attached algae density on cobbles in a nondestructive and continuous way. Quantitative analysis of the detached rate of attached algae has shown that the detachment ratio can be closely correlated with the work done by sediment impinging on the cobbles.

Publishing type：Research paper (scientific journal)  

In this paper, the results of a benchmark test launched within the framework of the NSF-PIRE project Modelling of Flood Hazards and Geomorphic Impacts of Levee Breach and Dam Failure are presented. Experiments of two-dimensional dam-break flows over a sand bed were conducted at Université catholique de Louvain, Belgium. The water level evolution at eight gauging points was measured as well as the final bed topography. Intense scour occurred close to the failed dam, while significant deposition was observed further downstream. From these experiments, a benchmark was proposed to the scientific community, consisting of blind test simulations, that is, without any prior knowledge of the measurements. Twelve different teams of modellers from eight countries participated in the study. Here, the numerical models used in this test are briefly presented. The results are commented upon, in view of evaluating the modelling capabilities and identifying the challenges that may open pathways for further research. © 2012 Copyright International Association for Hydro-Environment Engineering and Research.

DOI： 10.1080/00221686.2012.689682

Publishing type：Research paper (scientific journal)  

A simple but accurate interpolation procedure for obtaining the three-dimensional distribution of three-component velocity data, from moving acoustic doppler current profiler (ADCP) observation data, is proposed. For understanding actual flow structure within a river with complex bathymetry, the three-dimensional mean velocity field provides a basic picture of the flow. For obtaining the three-dimensional distribution of three-component velocity data, in this work, anisotropic gridding was introduced in order to remove the random component of measured velocity data caused by the turbulence of the flow and measurement error. A continuity correction based on the pressure equation was used to reduce both random and systematic errors. The accuracy of the developed method was evaluated using three-dimensional flow simulation data from a detached-eddy simulation (DES). By using the procedure developed, the complex flow structure surrounding the spur dikes section in the Uji River was successfully visualized and explored. The proposed method shows superiorities in both accuracy and consistency for the interpolated velocity field, as compared to the kriging and inverse-distance weighted (IDW) methods. © 2012. American Geophysical Union.

DOI： 10.1029/2011WR010867

Publishing type：Research paper (scientific journal)  

This paper examines the feasibility of applying a mobile, large scale particle image velocimetry (LS-PIV) system to a 300m reach of a small river in order to estimate the discharge. Detailed velocity measurements at a number of locations were carried out using an acoustic Doppler current profiler (ADCP) and acoustic Doppler velocimetry (ADV) for inbank, bankfull and overbank flows. The lateral distributions of the velocity index k (i.e., the ratio of the depth-averaged velocity to the surface velocity) were found to be influenced by the secondary currents, channel vegetation and flow conditions. An attempt is made to quantify the relationship between secondary flow and the velocity index. Appropriate conclusions and advice relating to the practical use of a LS-PIV system as applied to a small river are given. © 2012 Elsevier Ltd.

DOI： 10.1016/j.flowmeasinst.2012.02.001

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

Growth and detachment of the attached-algae in river bed is one of the key factors in ecological system in the river. The detachment process of the algae can be categorized into three types, namely 1 Natural detachment due to aging, 2 Detachment due to flow and bed material load and 3 Detachment caused by rolling of the bed material. To evaluate the detachment processes during flood, we conducted a series of field survey in a site in the Johge River. In the period this survey had been conducted, a flushing discharge and a flood due to typhoon were observed. The chlorophyll-a densities on the bed material before and after floods were measured. Based on the field survey results, the detachment processes of algae are evaluated, and a new model to estimate an amount of detachment during the flood is proposed.

Publishing type：Research paper (scientific journal)  

© ASCE. Embankment breaching processes are very complex and involve mixed-regime free-surface flow with overfalls and hydraulic jumps, pressurized pipe flow, strong vertical and lateral erosion, discrete mass failure, and headcut migration. The failure mode and mechanism are affected by upstream and downstream water conditions, embankment configurations, and soil properties and state. Great progress has been made to investigate embankment breaching processes through laboratory and field experiments and real-world case studies. However, most laboratory experiments were for smallscale homogeneous embankments, only a few outdoor experiments were conducted at large scales (up to several meters in height) and/or were of composite construction, and only limited data sets for historical embankment failures were sufficiently documented. A number of parametric, simplified physically-based, and detailed multidimensional physically-based embankment breach models have been established in the past decades, but prediction with these models involves significant uncertainties. The biggest limitation of the existing breach models is quantifying erosion rates or erodibility of cohesive soils and sediment entrainment under embankment break/breaching flows. It is important to conduct more large-scale laboratory experiments and field case studies to improve existing embankment breach models or develop new ones. These models should also be enhanced by incorporating better physical insights, by using more efficient computational technologies, and integrating them into more robust flood forecasting and risk assessment systems with comprehensive relevant databases

DOI： 10.1061/(ASCE)HY.1943-7900.0000498

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

DOI： 10.1016/j.jher.2010.12.004

Web of Science

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

Railway and road embankments on a flood plain affect the propagation of inundation flow. In inundation simulation, the embankment in the flooded area is treated as the solid wall that inundation flow is able to overflow. However, the embankment involves the potential to be damaged during a severe flood event, and the breakage of the embankments causes not only physical damage but also a reduction of transportation function. In this study, the damage to the embankment of the Kishin line during the flood event in August 2009 is analyzed. The topographic and hydraulic conditions of the embankment failure are discussed.

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

An estimation method of flood discharge hydrograph is developed that couples a 2-D unsteady flow model considering the effect of vegetation toppling and a 2-D model for bed elevation change due to bed load transport. The method is applied to a flush flood from the Haizuka dam in the Jouge River where vegetation became submerged with deformation in large areas. Measurements of water level hydrographs at several points, the discharge with ADCP at a weir and bed elevation change at a point were carried out during the flood. It is shown that the estimated discharge hydrograph gives reasonable agreement with the measured result and that the reliable data of bed elevation is crucial to accurate estimation of discharge hydrograph in a steep slope river.

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

Field measurement and numerical simulation are carried out for an artificial flush flood in 2010 in the downstream reach of Haizuka dam located at the Jouge River to quantify the effect of flush flood on the exfoliation of attached algae. Measured items are water level, chlorophyll a (Chl-a), SS and attached algae at several locations. The relation between Chl-a attached to riverbed stones and velocity at the same location before the flood and the relation between detached rate of the algae and accumulated bed shear stress during the flood are obtained based on the field observation and 2-D numerical simulation. Based on these relations the total amount of supplied algae to water over the measurement reach during the flood is estimated to around 15.0kg in which the total amount of exfoliated algae is estimated to around 9.4kg.

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

DOI： 10.1002/hyp.7608

Web of Science

Publishing type：Research paper (scientific journal)  

It is well known that a surface oscillation is generated by installing a rectangular side-cavity structure to an open channel flow. The intensity of oscillation increases greatly as the increase of the Froude number. In addition, the type of oscillation changes easily depending on the shape of side-cavity and the width of ratio of the main channel to the depth of side-cavity. In our previous experiments, we categorized the oscillation pattern into four types. In the present study, the space-time correlation relations between the surface elevation and the velocity component at the inlet of the side-cavity is examined by the large eddy simulation that allows the water surface variation. It was found that the type of oscillation is largely divided into two types, i. e. with and without a strong depth-velocity correlation.

Publishing type：Research paper (scientific journal)  

Morphological evolution of the topography of the reach with groins is investigated using a numerical model solving the two-dimensional shallow water equations in this study. A flood event is represented to discuss the dischargedependent change of the interaction between flow structure and sediment transport. The primary flow is meandering according to alternate or multiple bars formed in the channel during low-water and medium-water periods, and it is found that deposition of the fine sand and silt on vegetated area between groins is affected by the meander of primary flow. During a high-water period, on the contrary, the primary flow follows the large-scale topography of the river so that flow on the flood plain is also straightforward according to the large-scale channel form. This straightforward flow on the flood plain, formed between groins, induces three-dimensional flow structure (longitudinal vortex), develops streak go through the groins longitudinally, and forms the rib-shaped topography on the flood plain. This ribbed bathymetry is highly interacting with sediment transport not only within the flood plain but also between the channel and the flood plain.

Publishing type：Research paper (scientific journal)  

In Recent years, flood disasters are frequently taking place where relatively steep slope rivers meet in the mountainous area. The cause of the disasters is mainly due to the sudden rise of water level at a confluence, which sometimes accompanies a hydraulic jump in the upstream region. In this research, a numerical simulation based on the shallow water equations and the unstructured grid system is performed to investigate the effect of the discharge ratio to the flow patterns and the riverbed change at a confluence. In order to simulate a river confluence in the mountains, the main channel slope is set at 1/80 with a tributary channel slope of 1/40. Laboratory experiments are also conducted to provide data with respect to water surface profiles and bed variation. Water surface velocity distributions are obtained by an imaging technique, LSPIV, using a high vision video camera. It is made clear that general flow features calculated by the simulation model agree fairly well with the experiments including the locations of hydraulic jumps and local scour.

Publishing type：Research paper (scientific journal)  

The procedure of extraction of three-dimensional distribution of velocity field from ADCP measurement data is presented in this study. Cross-sectional velocity distributions have been generally used to indicate three-dimensional feature of flow. However complex flow fields, generated by combination of a complex bathymetry, curve of the channel and river structure, are difficult to investigate only by using the cross sectional velocity distribution. In this study, anisotropic averaging and interpolation method is introduced to remove random component caused by turbulence of flow and random error of measurement. The continuity correction using pressure equation is also used to reduce both random and system errors. The validity of our procedure is confirmed by using three-dimensional numerical simulation result. Finally, by using our procedure, the complex flow around spur-dikes is explored.

Publishing type：Research paper (scientific journal)  

Using a surface video record of a large-scale flood in Yoshino River, Shikoku, Japan, some problems related to application method of Large Scale Particle Image Velocimetry (LSPIV) are examined in detail. First, from a hydraulic point of view, a new method is proposed for exclusion of incorrect velocity data and calculation of time-averaged velocity. Second, decision standards are examined with respect to the primary LSPIV model parameters. As a result, it was confirmed that the appropriate time-interval, template size and detection area size for PIV analysis procedure range between 1/3 to 1/2 seconds, between 1.5 to 2 times the maximum size of brightness pattern and about 2 times the estimated displacement distance of templates, respectively.

Publishing type：Research paper (scientific journal)  

Open-channel flows with a relatively large-scale side cavity zone exhibits water surface oscillations in spanwise or streamwise directions. Although the side cavity zone is installed for improving the water-friendly environment, such oscillations, once occurred in the actual river in the urban areas, may cause flooding, resulting in a large damage in the residential area. In order to investigate the flow features associated with such surface oscillation, the authors have developed a 3D LES model that utilizes a density function for detecting air-water interface. With the developed model, it becomes possible to simulate water surface oscillation observed in the experiments. In this paper, the flow features related to the water surface oscillation as well as the local flow features along the interface between the main channel and the side cavity zone are investigated for the subcritical flows with relatively large Froude number.

Publishing type：Research paper (scientific journal)  

Numerical simulation and experimental measurement are used to investigate the resonant instabilities in flow past a side cavity. The shallow water flow equations are solved by using the finite volume method with an unstructured grid system. The flow characteristics of numerical and experimental results are compared and found to be in favorable agreement qualitatively between the results, especially behavior of a long term and large scale oscillation mechanism. The frequencies of oscillation mode analyzed by POD (Proper Orthogonal Decomposition) are compared to theoretical and semi-empirical formulae, from which the feature of the short term oscillation and the long term one are distinguished. The condition which provides an intense long term oscillation are discussed by using experimental and numerical results.

Publishing type：Research paper (scientific journal)  

There occurred a levee break of the Izushi River near the district of Torii in Izushi-chou, Hyogo Pref. on Oct. 20, 2004, which is caused by the heavy rainfall induced by Typhoon No. 23 (TOKAGE). In order to perform a high-resolution inundation simulation of this area, detailed topographical data is measured by using a kinematic GPS system. Two dimensional shallow water equation based on the unstructured grid system is used for the simulation. Since the grid size is adjusted so that respective houses can be resolved in the simulation, it became possible to estimate hydrodynamic forces exerted on the houses, which is found to have a close relation to the actual house damages.

Publishing type：Research paper (scientific journal)  

When a relatively large side cavity zone is installed in an open channel, the influence of separated vortices and recirculation flow generated at the zone is sometimes exerted to the main flow as water surface oscillation. The mechanism of the oscillation is still not clearly understood because of the complexity of the phenomena. In this research, by using a stereoscopic surface measurement system developed by the authors, time-dependent water surface configurations are successfully measured at a sampling rate of 12Hz, from which general features of the surface oscillation is made clear for a wide range of the Froude number. We then applied the proper orthogonal decomposition (POD) method to the measured data and found out that the surface oscillation can be clearly decomposed into a Seiche-like major mode and sub-modes with smaller wavelengths.

Publishing type：Research paper (scientific journal)  

This study aims to clarify the flow structure in curved rectangular open channel with a side concavity. Surface flow velocity profile is measured using PIV technique and bottom flow direction is obtained by a new method using image analysis of bottom streamlines visualized by dye injection method. In curved channel flow, developing process of secondary flow is examined. The structure of channel flow with side concavity in each side is investigated and their differences are clarified. The results show that water level is lager in the case the side concavity is installed in the outer bank. On the other hand, surface fluctuation is greater in the inner bank case. The aspect ratio of channel width to water depth changed the structure of the flow around side concavity.

Publishing type：Research paper (scientific journal)  

This paper presentsa new innovativem ethod for measuringt wo-dimensionawl aterl evel variations.T his method uses a pair of images captured by a stereo arrangement of CCD cameras. With this method it is possible to measure the instantaneous water surface form non-intrusively. At first, we explain the measurement principal and the experimental procedure for obtaining stereo images. Second, we exam measurement accuracy by applying our technique to waves and surface ripples generated by a falling drop, and find that we can resolve waves as small as 1mm. Third, we measure periodic surface fluctuation produced in an asymmetry cavity with a reasonable accuracy. Finally, we describe the problems of this technique and future research plans.

Publishing type：Research paper (scientific journal)  

A new two-dimensional simulation model for urban rivers applicable to complicated sidewall geometry was developed. The proposed model is based on the finite volume method (FVM) with flux differcncing splitting (FDS) under unstructured grid system. Firstly, the performance of the model was evaluated by the comparison with experimental results for a straight open-channel with a long side concavity having an aspect ratio of ten. The calculated results showed fairly good agreements with the experiments, indicating the good performance of the model. Secondly, the model was used to examine the effects of various sidewall geometries on the local water-level increase at the side concavity section. It was shown that water depth variations within the side concavity section can be controlled by a separation wall and the optimum arrangement of the separation wall for the present side concavity shape was proposed.

Publishing type：Research paper (scientific journal)  

Field observations on the surface flow were carried out in a straight reach of the Uji River. Velocity distributions on the water surface were obtained based on the captured video images by means of large-scale particle image velocimetry (LSPIV). Flow structures around spur dykes are studied for both non-submerged and submerged cases.<BR>It is clearly seen that, for both cases, the dykes are working as an additional roughness. Their effect on channel conveyance capacity is estimated in terms of the effective channel width calculated from the velocity distributions. It is also of interest that the maximum velocity filament appears at a different position as the water depth varies in case of the channel with single-side dykes such as studied here. In addition, large-scale boils shedding from the submerged dykes are clearly observed and their origin and advection mechanisms are also evaluated.

Publishing type：Research paper (scientific journal)  

A new one-dimensional velocity measurement method using image analysis was developed. In this method, image intensity distribution for a line specified in the mean flow direction on a flow video image was cumulated in the temporal direction, thereby creating a spatiotemporal image with a striped pattern indicating the mean velocity on the specified line. The striped pattern is created due to the convection of image intensity conveyed by the mean flow. This method is applicable to river surface images videotaped from a riverbank during flood. Since the images are distorted the spatial resolution in the far field is relatively low; however, the presented method showed a favorable performance in the measurement of flood surface flow of the U River. The result was compared with that by the large-scale particle image velocimetry (LSPIV) and the new method's superiority was verified. Also a method for improving mapping relationship between the CRT coordinates and the physical coordinates was demonstrated.

Event date： 2024.2

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛知県名古屋市   Country：Japan  

Event date： 2023.12

Language：English   Presentation type：Oral presentation (general)  

Event date： 2023.12

Venue：名古屋   Country：Japan  

Event date： 2023.11

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：愛知県名古屋市   Country：Japan  

Event date： 2023.8 - 2023.9

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Country：Japan  

Event date： 2023.8

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：北海道旭川市   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛知県豊田市   Country：Japan  

Event date： 2023.2

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokushima, Japan   Country：Japan  

Event date： 2023.2

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：三重県伊勢市   Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Venue：ウイーン   Country：Austria  

DOI： https://doi.org/10.5194/egusphere-egu22-9236

Event date： 2022.3

Language：English   Presentation type：Oral presentation (general)  

Venue：中部大学   Country：Japan  

Event date： 2022.2

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：豊田工業高等専門学校  

Event date： 2021.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Online   Country：Korea, Republic of  

Event date： 2021.4

Language：English   Presentation type：Oral presentation (general)  

DOI： 10.5194/egusphere-egu21-3753

Event date： 2021.2

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン  

Event date： 2021.2

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン  

Event date： 2020.9

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.7

Language：English   Presentation type：Oral presentation (general)  

Country：Netherlands  

Event date： 2020.3

Language：English   Presentation type：Oral presentation (general)  

Venue：愛知県長野市   Country：Japan  

Event date： 2020.2

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.2

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Country：Panama  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Country：Panama  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Country：Hungary  

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.2

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.9

Language：English   Presentation type：Oral presentation (general)  

Country：Korea, Republic of  

Event date： 2018.8

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.8

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2018.2

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.8

Language：English   Presentation type：Oral presentation (general)  

Country：Malaysia  

Event date： 2017.8

Language：English   Presentation type：Oral presentation (general)  

Country：Malaysia  

Event date： 2017.7

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.7

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.7

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Country：Japan  

Event date： 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016

Language：English   Presentation type：Oral presentation (general)  

Country：Australia