Faculty Profiles - TANIKAWA, Hiroki

Papers - TANIKAWA, Hiroki

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Feasibility of a Simplified, Clinically Oriented, Three-dimensional Gait Analysis System for the Gait Evaluation of Stroke Patients. Reviewed

Mukaino M, Ohtsuka K, Tsuchiyama K, Matsuda F, Inagaki K, Yamada J, Tanikawa H, Saitoh E

Progress in rehabilitation medicine Vol. 1 page： 20160001 2016

Innovative Planning and Evaluation System for District Heating Using Waste Heat Considering Spatial Configuration: A Case in Fukushima, Japan Reviewed

谷川寛樹

Resources Conservation and Recycling Vol. 21 2016

The Weight of Society Over Time and Space: A Comprehensive Account of the Construction Material Stock of Japan, 1945-2010 Reviewed International coauthorship

Hiroki Tanikawa, Tomer Fishman, Keijiro Okuoka, Kenji Sugimoto

JOURNAL OF INDUSTRIAL ECOLOGY Vol. 19 ( 5 ) page： 778 - 791 2015.10

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-BLACKWELL

In order to fully comprehend the socioeconomic metabolic (SEM) dynamics and material balance of nations, long-term accounting of economy-wide material stock is necessary in parallel to material flow accounts. Nevertheless, material stock accounts have been scarce, isolated, and mostly focused either on single materials, short time spans, or small regions. This study has two objectives: (1) review the state of the art of material stock research in the SEM discourse and (2) present a project to map, in a high level of detail, the in-use construction material stocks of Japan and its 47 prefectures from the 1940s until the present era. This project documents the two major depositories of material stock: buildings and infrastructure. We describe the challenges and benefits of utilizing a bottom-up approach, in order to promote its usage in material stock studies. The resulting database presents the accumulation of stock over time, as well as visually displaying the spatial distribution of the stock using geographical information systems (GIS), which, we argue, is an essential aspect of material stock analysis in the context of socioeconomic metabolism research.

DOI： 10.1111/jiec.12284

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Concrete transformation of buildings in China and implications for the steel cycle Reviewed

Tao Wang, Xin Tian, Seiji Hashimoto, Hiroki Tanikawa

RESOURCES CONSERVATION AND RECYCLING Vol. 103 page： 205 - 215 2015.10

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

Urbanization and real estate development are two mighty impetuses for the growth of China. An enhanced dynamic modeling has been devised to explore stocks and flows of buildings in the country and to quantify the related steel cycle. The uncertainties of the variables and results are investigated by the means of Monte Carlo method and sampling analysis. The building stocks are expected to increase to some 85-130 billion m(2) in the mid-century, about 40-100% up from the current level. Throughout China but in urban areas in particular, concrete structures are replacing the buildings made of wood, clay brick, and primitive materials. By 2050 every two out of three buildings in China will be reinforced concrete- or steel-framed, leading to substantial demand for ferrous metals.
Scenarios analysis shows that a slowing down in the building stock expansion will likely occur in China in no more than ten years. This may open up a transition with profound industrial and resource implications. Increasing businesses for the construction industry may emerge from maintenance, retrofitting, and end-of-life management of existing buildings. The steel industry shall reform its capacity to conform to the growingly available secondary resources and the declining requirement for construction steel. Efficient and appropriate recycling of steel content from waste concrete will play an important role in material conservation. A collaboration of improvements in process material efficiency with lifetime extension and application of high-strength steel may save nearly 40% of primary iron ores for building use in the coming four decades. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.resconrec.2015.07.021

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Comparative studies on the driving factors of resource flows in Myanmar, the Philippines, and Bangladesh Reviewed

Maung Kyaw Nyunt, Martinico-Perez Marianne Faith G., Komatsu Takahiro, Mohammad Sujauddin, Murakami Shinsuke, Tanikawa Hiroki

ENVIRONMENTAL ECONOMICS AND POLICY STUDIES Vol. 17 ( 3 ) page： 407 - 429 2015.7

Comparative Studies on Driving Factors of Resource Flow in Myanmar, the Philippines and Bangladesh Reviewed

Kyaw Nyunt Maung, Marianne Faith G. Martinico-Perez, Takahiro Komatsu, Sujauddin Mohammad, Shinsuke Murakami, Hiroki Tanikawa

Environmental Economics and Policy Studies 2015.7

福島県北部沿岸地域におけるフライアッシュのクリンカー代替利用に関する地域循環圏の検討 Reviewed

木下卓大, 奥岡桂次郎, 谷川寛樹

土木学会論文集G (環境) Vol. 71 ( 6 ) page： 133-138 2015.6

マテリアルストックデータベースの拡充とストック利用効率の検討 Reviewed

山下剛弥, 奥岡桂次郎, 谷川寛樹　

土木学会論文集G (環境) Vol. 71 ( 6 ) page： 319-327 2015.6

低炭素化に向けた日本全国の土石系資源ストックフローの将来シナリオ分析 Reviewed

松井健吾,　長谷川正利,　高木重定,　奥岡桂次郎,　谷川寛樹

土木学会論文集G (環境) Vol. 71 ( 6 ) page： 309-317 2015.6

名古屋市中心部における4d−GISを用いた都市の経年変化によるMSFAに関する研究 Reviewed

青柳淳之介, 杉本賢二, 奥岡桂次郎, 谷川寛樹

土木学会論文集G (環境) Vol. 71 ( 6 ) page： 467-474 2015.6

The socio-economic drivers of material stock accumulation in Japan's prefectures Reviewed

Tomer Fishman, Heinz Schandl, Hiroki Tanikawa

ECOLOGICAL ECONOMICS Vol. 113 page： 76 - 84 2015.5

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

Physical economy research has, thus far, focused on the throughput of materials that underpin economic development. The role of stocks of buildings and infrastructure has remained underexplored, yet it is the physical stock that provides service to society. To fill this gap, this research investigates stock dynamics in Japan in relation to population and economic drivers using panel regression and IPAT analyses for the past five decades. We recognize characteristic changes in the strength and relative influence of the drivers throughout time, in different subnational regions, and on the dynamics of buildings compared to transportation infrastructure. We find that material stock accumulation mainly occurred due to growth in economic activity, specifically by tertiary sector demand. Apart from a period of government-driven stock accumulation in the 1990s to stimulate economic growth, as economic and population growth slowed stock accumulation dynamics also changed signaling a new stock saturation trend. Migration from rural to urban areas has recently become an influential driver, leaving behind underused buildings and roads. This analysis provides a case study on how socio-economic drivers and stock accumulation interacted and changed while the country matured, which may have implications for understanding stock dynamics in rapidly industrializing economies. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ecolecon.2015.03.001

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Greening China's Wastewater Treatment Infrastructure in the Face of Rapid Development Analysis Based on Material Stock and Flow through 2050 Reviewed

Hou, Wanxin, Tian, Xin, Tanikawa, Hiroki

Journal of Industrial Ecology Vol. 19 ( 1 ) page： 129 - 140 2015.2

FUTURE SENARIO ANALYSIS OF MATERIAL STOCK AND FLOW OF CONSTRUCTION MINERALS TOWARD DECARBONIZATION

MATSUI Kengo, HASEGAWA Masatoshi, TAKAGI Shigesada, OKUOKA Keijiro, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 71 ( 6 ) page： II_309 - II_317 2015

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

This study estimated future construction minerals stock and flow, and calculated its intensities. The intensities were calculated by construction mineral shipment and stock increase figures. The construction mineral stock and flow data was used to estimate CO2 emissions with a scenario type of using mixed cement, and to estimate recycling potential as recycled aggregate. The results show that buildings, roads, and other civil infrastructure have accumulated 100Mton, 120Mton, and 87Mton respectively. CO2 emissions in a scenario using mixed cement is 3.9Mton in 2050, which was found to be less than the 0.8Mton emissions in a scenario status type of not using mixed cement. Recycled aggregate demands would accumulate to 47Mton in 2050, and concrete waste by demolished buildings in 2050 would accumulate to 140Mton, therefore it is clarified that there is a large recycling potential.

DOI： 10.2208/jscejer.71.ii_309

CiNii Research

A STUDY ON MATERIAL STOCK AND FLOW ANALYSIS OVER TIME USING 4d-GIS IN NAGOYA CITY Reviewed

AOYAGI Junnosuke, SUGIMOTO Kenji, OKUOKA Keijiro, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 71 ( 6 ) page： II_467-II_474 2015

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

 A large amount of minerals become material flows in and out of urban areas when buildings and infrastructure, such as roads, are constructed and reconstructed. In order to do effective management of materials in a sound material-cycle society, it is necessary to estimate and grasp these material flows. This study describes a comparative MSFA (Material Stock and Flow Analysis) using 4d-GIS in the Nagoya city center for 1970, 1980, 1990, 1997, 2003, and 2009. Material stock in the case study area was found to be increasing, with large material accumulation in the commercial area. Additionaly, it was clarified that changes in the urban structure system has huge impacts on urban metabolism.

DOI： 10.2208/jscejer.71.II_467

REVISION OF JAPAN'S MATERIAL STOCK DATABASE AND REASSESMENT OF THE STOCK EFFICIENCY TRENDS Reviewed

YAMASHITA Takaya, OKUOKA Keijiro, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 71 ( 6 ) page： II_319-II_327 2015

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

Japan has large numbers of seaports, fishing harbors, and coastal facilities. Therefore, quantifying the kinds of material stock in there infrastructures is important. This study showed that seaports, fishing harbors, and coastal facilities have accumulated 783Mton, 1714Mton, 472Mton of material stock, respectively. In this way, this study expands the database of Japan's material stock to include seaports, fishing harbors, and coastal facilities, and provides a reassessment of these stock efficiency trends compared with other stock types. These results help to evaluate society's metabolism (inflows, stocking, and demolition of material).  Reassessment of stock efficiency trends regarding units of transportation showed that airports' efficiency trends grew. Roads' and rails' trends regarding freight increased, while seaports' stock trends in regards to number of passengers declined.

DOI： 10.2208/jscejer.71.II_319

NUMERICAL SIMULATION OF ROOFTOP EVAPOTRANSPIRATION AND CO2 REDUCTION EFFECTS OF BUILDINGS WITH GREEN ROOFS

HIRANO Yujiro, TANIKAWA Hiroki, FUJITA Tsuyoshi

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) Vol. 71 ( 4 ) page： I_439 - I_444 2015

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

This research evaluates evapotranspiration from rooftop vegetation and its effects of urban heat island mitigation and CO2 reduction in office building areas. First we conducted urban microclimate and air conditioning load simulation by using a coupled urban-canopy and building energy model (CM-BEM).Next, we calculated evapotranspiration on rooftops from latent heat flux derived from surface heat balance simulated by CM-BEM. From calculated evapotranspiration result, we determined required water volume and CO2 emissions for sprinkling water. Then, we quantified the CO2 reduction effects of rooftop greening by comparing the CO2 emissions for sprinkling water and the CO2 reduction by cooling energy savings calculated from air-conditioning load simulation. Finally, we evaluated the relationships between evapotranspiration and urban heat island mitigation effects and CO2 reduction effects.

DOI： 10.2208/jscejhe.71.i_439

CiNii Research

Anthropogenic Disturbance Estimation Based on Surface Elevation Change Using DEM Reviewed

SUGIMOTO Kenji, KUROIWA Fumi, OKUOKA Keijiro, TANIKAWA Hiroki

ENVIRONMENTAL SCIENCE Vol. 28 ( 2 ) page： 153 - 161 2015

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

For analyzing the relationship with natural environment and socio-economy that characterized huge materials flow, it is important to understand the dynamics of soil and stone. However, quantitative grasp of “hidden material flow” is not sufficiency performed since it is out of material calculation process. This study presents and discusses the effectiveness of a method to estimate anthropogenic disturbance of soil and sand, based on surface elevation change over time using Digital Elevation Model (DEM). First, a case study was conducted focusing on an area where a large-scale extraction of soil and sand has occurred in Misaki-cho, Osaka Prefecture. In the case study, the viability to estimate the changes of soil movement with GIS by creating raster surface model from DEM based on counter map, aerial photo and satellite image was confirmed. As a result of the estimation sediment movement do to the volume changes as from 75.81 to 81.68 million ton between before and after soil excavation. The differences between estimates and statistics are due to the vertical accuracy of DEM, conversion rate to rock products and natural processes. Despite the estimate error induced by the vertical accuracy, satellite DEM is useful to grasp anthropogenic disturbance in data limited area.

DOI： 10.11353/sesj.28.153

CiNii Research

Time-series analysis and prediction of building material stock and flow using 4d-GIS Reviewed

Kenji Sugimoto, Hiroyoshi Morita, Hiroki Tanikawa

Computers in Urban Planning and Urban Management page： 243 1-17 2015

A STUDY ON A REGIONAL RECYCLING ZONE FOR EFFECIENT USE OF FLY ASH AS CLINKER SUBSTITUTE MATERIAL IN THE NOETHERN COSTAL AREAS OF FUKUSHIMA

KINOSHITA Takahiro, OKUOKA Keijiro, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 71 ( 6 ) page： II_133 - II_138 2015

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

In order to realize a recycling-oriented society, it is important to advance industrial symbiosis, considering characteristics of area and material. After the Great East Japan Earthquake disaster, coal power generation replaced nuclear power generation, increasing the amount of Fly-ash (FA) byproduct whose utilization is a future problem. This study evaluates the potential of FA recycling as construction material to be used in the reconstruction and restoration of buildings, and construction of coastal protection facilities in Fukushima. It was found that there is big FA input potential in the city of Sendai which is located 50km north of the power station. In addition, the amount of FA produced by the power station is bigger than the FA input potential in the recycling zone.

DOI： 10.2208/jscejer.71.ii_133

CiNii Research

Time-series analysis and prediction of building material stock and flow using 4d-GIS Reviewed

Sugimoto K., Morita H., Tanikawa H.

CUPUM 2015 - 14th International Conference on Computers in Urban Planning and Urban Management 2015

Language：English Publishing type：Research paper (scientific journal) Publisher：CUPUM 2015 - 14th International Conference on Computers in Urban Planning and Urban Management

We developed 4d-GIS, which is a database of spatial 3D GIS data with a time scale, to estimate building material stock and flow and visualize the transition of buildings in urban districts for contribution to spatial designs. By utilizing 4d-GIS, it was found that steel buildings initially accounted for 60%, but the number of reinforced concrete buildings increased. As for building material stock, it has increased from 0.35 million ton in 1961 to 97.5 million tons in 2010, because of the increase of RC buildings and vir-tualization. We predicted the building renovation for Business As Usual (BAU) and District Renewal Plan (DRP) scenarios up to 2050. The results show that building material stock does not differ much between BAU and DRP scenarios in 2050, but it was observed in the DRP scenario, building material stock increased by 0.2 million ton because buildings will be re-built collectively in units.

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Papers - TANIKAWA, Hiroki