研究者詳細 - 谷川　寛樹

Concrete transformation of buildings in China and implications for the steel cycle 査読有り

Wang, T; Tian, X; Hashimoto, S; Tanikawa, H

RESOURCES CONSERVATION AND RECYCLING 103 巻頁： 205 - 215 2015年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Resources, Conservation and Recycling

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 m2 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.

DOI： 10.1016/j.resconrec.2015.07.021

Comparative studies on the driving factors of resource flows in Myanmar, the Philippines, and Bangladesh 査読有り

Maung K.

Environmental Economics and Policy Studies 17 巻 ( 3 ) 頁： 407 - 429 2015年7月

Comparative Studies on Driving Factors of Resource Flow in Myanmar, the Philippines and Bangladesh 査読有り

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

Environmental Economics and Policy Studies 2015年7月

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査読有り

木下卓大, 奥岡桂次郎, 谷川寛樹

土木学会論文集G (環境) 71 巻 ( 6 ) 頁： 133-138 2015年6月

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査読有り

山下剛弥, 奥岡桂次郎, 谷川寛樹　

土木学会論文集G (環境) 71 巻 ( 6 ) 頁： 319-327 2015年6月

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査読有り

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) 71 巻 ( 6 ) 頁： 309-317 2015年6月

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に関する研究査読有り

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) 71 巻 ( 6 ) 頁： 467-474 2015年6月

The socio-economic drivers of material stock accumulation in Japan's prefectures 査読有り

Fishman, T; Schandl, H; Tanikawa, H

ECOLOGICAL ECONOMICS 113 巻頁： 76 - 84 2015年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Ecological Economics

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.

DOI： 10.1016/j.ecolecon.2015.03.001

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

Hou, WX; Tian, X; Tanikawa, H

JOURNAL OF INDUSTRIAL ECOLOGY 19 巻 ( 1 ) 頁： 129 - 140 2015年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Industrial Ecology

Summary: Wastewater treatment infrastructure (WWTI) construction in China has entered an accelerated stage of development in recent years as a result of rapid economic growth, urbanization, and the demand for improving water quality. As a result, a large amount of resources and materials will be allocated for the WWTI, and it is particularly important to find ways to reduce resource consumption effectively so that social dematerialization and sustainable development can be achieved. In this study, we employed the dynamic material flow model to estimate the material flows and stocks of WWTIs and the associated carbon dioxide (CO2) emissions through 2050, considering effects of a rise in water consumption, a longer lifetime, and an increased material recycling rate. Our results indicate that material consumption in WWTIs will increase rapidly through 2025 to meet the needs of the increased volume of discharged wastewater as well as to overcome the shortage of existing wastewater treatment plants. In contrast with the moderate effects of rise in water consumption, prolonging the lifetime will greatly reduce material consumption in WWTI construction during the period 2030-2050, and approximately 60% of the total material input will be saved in the medium-lifetime scenario, compared with the short-lifetime scenario. Material output and CO2 emissions associated with WWTIs will be reduced by 87% and 37%, respectively, in the medium-lifetime scenario, compared with the short-lifetime scenario, under high-water-consumption growth. Our results highlight the great importance of pipeline construction and cement consumption in resource consumption associated with WWTI construction in China. Moreover, this study also examined the potential ways to reduce material consumption in WWTI construction in the context of the demand chain, the design, construction, operation and management, and demolition.

DOI： 10.1111/jiec.12186