Faculty Profiles - TANIKAWA, Hiroki

Papers - TANIKAWA, Hiroki

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人為的攪拌による土石移動量の推計に関する研究 Reviewed

奥岡桂次郎, 谷川寛樹

環境情報科学論文集 Vol. 28 page： 88 - 94 2015

人為的攪拌による土石移動量の推計に関する研究 Reviewed

吉田圭介, 奥岡桂次郎, 杉本賢二, 谷川寛樹

環境情報科学論文集 2014.12

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

Wanxin Hou, Xin Tia, Hiroki Tanikawa

Vol. 19 ( 1 ) page： 129-140 2014.9

衛星夜間光と合成開口レーダを用いた建物延床面積の推計モデルの開発 Reviewed

黒田将平，杉本賢二，奥岡桂次郎，谷川寛樹

土木学会論文集G (環境) Vol. 70 ( 6 ) page： 97-106 2014.7

China's carbon footprint: A regional perspective on the effect of transitions in consumption and production patterns Reviewed

Xin Tian, Miao Chang, Chen Lin, Hiroki Tanikawa

APPLIED ENERGY Vol. 123 page： 19 - 28 2014.6

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

A better understanding of CO2 emission trends caused by domestic consumption (referred to as the carbon footprint) in China, especially in the context of changes in consumption and production patterns triggered by economic development in recent years, is important to develop effective approaches for curbing the fast-growing emissions. As the various regions in mainland China exhibit great disparities in socioeconomic factors and are thus in different stages of development, this study aims to obtain a regional map of carbon footprints in China, and address the changes, sources, and drivers of regional carbon footprints. Result indicates that regional per-capita carbon footprint varied greatly from 2.9 ton in the Southwest to 8.4 ton in Jingjin in 2007, and this disparity can be attributed to differences in regional income. On average, construction and services accounted for about 70% of the regional footprint in 2007. From a view of contributions from final demand activities, it was found that on average 56% of the regional footprint was associated with investment activity, 35% was related to household consumption, and 9% was attributable to government consumption. The results of structural decomposition show that while changes in consumption patterns have promoted rapid growth in the carbon footprint across all regions, the contribution from changes in production patterns varied widely, depending on what changes in production structure and CO2 intensity improvements were undertaken. Further CO2 intensity improvements and low-carbon optimization of the production structure will be important approaches for curbing the rapid growth of the carbon footprint across all regions of China. (C) 2014 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.apenergy.2014.02.016

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Accounting for the Material Stock of Nations Reviewed Open Access

Tomer Fishman, Heinz Schandl, Hiroki Tanikawa, Paul Walker, Fridolin Krausmann

JOURNAL OF INDUSTRIAL ECOLOGY Vol. 18 ( 3 ) page： 407 - 420 2014.6

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

National material stock (MS) accounts have been a neglected field of analysis in industrial ecology, possibly because of the difficulty in establishing such accounts. In this research, we propose a novel method to model national MS based on historical material flow data. This enables us to avoid the laborious data work involved with bottom-up accounts for stocks and to arrive at plausible levels of stock accumulation for nations. We apply the method for the United States and Japan to establish a proof of concept for two very different cases of industrial development. Looking at a period of 75 years (1930-2005), we find that per capita MS has been much higher in the United States for the entire period, but that Japan has experienced much higher growth rates throughout, in line with Japan's late industrial development. By 2005, however, both Japan and the United States arrive at a very similar level of national MS of 310 to 375 tonnes per capita, respectively. This research provides new insight into the relationship between MS and flows in national economies and enables us to extend the debate about material efficiency from a narrow perspective of throughput to a broader perspective of stocks.

DOI： 10.1111/jiec.12114

Estimates of Lost Material Stock of Buildings and Roads Due to the Great East Japan Earthquake and Tsunami Reviewed

Hiroki Tanikawa, Shunsuke Managi, Cherry Myo Lwin

JOURNAL OF INDUSTRIAL ECOLOGY Vol. 18 ( 3 ) page： 421 - 431 2014.6

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

This article describes research conducted for the Japanese government in the wake of the magnitude 9.0 earthquake and tsunami that struck eastern Japan on March 11, 2011. In this study, material stock analysis (MSA) is used to examine the losses of building and infrastructure materials after this disaster. Estimates of the magnitude of material stock that has lost its social function as a result of a disaster can indicate the quantities required for reconstruction, help garner a better understanding of the volumes of waste flows generated by that disaster, and also help in the course of policy deliberations in the recovery of disaster-stricken areas. Calculations of the lost building and road materials in the five prefectures most affected were undertaken. Analysis in this study is based on the use of geographical information systems (GIS) databases and statistics; it aims to (1) describe in spatial terms what construction materials were lost, (2) estimate the amount of infrastructure material needed to rehabilitate disaster areas, and (3) indicate the amount of lost material stock that should be taken into consideration during government policy deliberations. Our analysis concludes that the material stock losses of buildings and road infrastructure are 31.8 and 2.1 million tonnes, respectively. This research approach and the use of spatial MSA can be useful for urban planners and may also convey more appropriate information about disposal based on the work of municipalities in disaster-afflicted areas.

DOI： 10.1111/jiec.12126

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Modeling In-Use Steel Stock in China's Buildings and Civil Engineering Infrastructure Using Time-Series of DMSP/OLS Nighttime Lights Reviewed Open Access

Hanwei Liang, Hiroki Tanikawa, Yasunari Matsuno, Liang Dong

REMOTE SENSING Vol. 6 ( 6 ) page： 4780 - 4800 2014.6

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

China's rapid urbanization has led to increasing steel consumption for buildings and civil engineering infrastructure. The in-use steel stock in the same is considered to be closely related to social welfare and urban metabolism. Traditional approaches for determining the in-use steel stock are labor-intensive and time-consuming processes and always hindered by the availability of statistical data. To address this issue, this study proposed the use of long-term nighttime lights as a proxy to effectively estimate in-use steel stock for buildings (IUSSB) and civil engineering infrastructure (IUSSCE) at the provincial level in China. Significant relationships between nighttime lights versus IUSSB and IUSSCE were observed for provincial variables in a single year, as well as for time series variables of a single province. However, these relationships were found to differ among provinces (referred to as. inter-individual differences.) and with time (referred to as. temporal differences.). Panel regression models were therefore proposed to estimate IUSSB and IUSSCE in consideration of the temporal and inter-individual differences based on a dataset covering 1992-2007. These models were validated using data for 2008, and the results showed good estimation for both IUSSB and IUSSCE. The proposed approach can be used to easily monitor the dynamic of IUSSB and IUSSCE in China. This should be critical in providing valuable information for policy making regarding regional development of buildings and infrastructure, sustainable urban resource management, and cross-boundary material recycling.

DOI： 10.3390/rs6064780

Exploring China's Materialization Process with Economic Transition: Analysis of Raw Material Consumption and Its Socioeconomic Drivers Reviewed

Heming Wang, Xin Tian, Hiroki Tanikawa, Miao Chang, Seiji Hashimoto, Yuichi Moriguchi, Zhongwu Lu

ENVIRONMENTAL SCIENCE & TECHNOLOGY Vol. 48 ( 9 ) page： 5025 - 5032 2014.5

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

China's rapidly growing economy is accelerating its materialization process and thereby creating serious environmental problems at both local and global levels. Understanding the key drivers behind China's mass consumption of raw materials is thus crucial for developing sustainable resource management and providing valuable insights into how other emerging economies may be aiming to accomplish a low resource-dependent future. Our results show that China's raw material consumption (RMC) rose dramatically from 11.9 billion tons in 1997 to 20.4 billion tons in 2007, at an average annual growth rate at 5.5%. In particular, nonferrous metal minerals and iron ores increased at the highest rate, while nonmetallic minerals showed the greatest proportion (over 60%). We find that China's accelerating materialization process is closely related to its levels of urbanization and industrialization, notably demand for raw materials in the construction, services, and heavy manufacturing sectors. The growing domestic final demand level is the strongest contributor of China's growth in RMC, whereas changes in final demand composition are the largest contributors to reducing it. However, the expected offsetting effect from changes in production pattern and production-related technology level, which should be the focus of future dematerialization in China, could not be found.

DOI： 10.1021/es405812w

How does industrial structure change impact carbon dioxide emissions? A comparative analysis focusing on nine provincial regions in China Reviewed

Xin Tian, Miao Chang, Feng Shi, Hiroki Tanikawa

ENVIRONMENTAL SCIENCE & POLICY Vol. 37 page： 243 - 254 2014.3

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

China as a whole is undergoing rapid industrial structure change, but this process is proceeding in a particularly unequal manner across regions. Understanding these changes and their associated impacts on CO2 emissions in these regions is a vital step toward appropriately targeted policy making. In this paper, we conduct both regional analysis throughout the nation and case studies focused on nine typical regions in order to identify regional patterns of industrial structure change and CO2 emissions. Results indicate that structural change in primary, secondary, and tertiary sectors was highly correlated, but structural change by industrial sector did not correspond well, with the stage of economic development. The disparity in regional industrial structure impacts regional CO2 emissions substantially. First, industrial structure changes involving a shift from agriculture, mining, and light manufacturing-to resource-related heavy manufacturing in many regions led to a rapid increase in CO2 emissions at the national level. Second, production structure change, especially in construction and services sectors, is an important source of CO2 emission growth in regions. Some developed regions with vastly improved input efficiency in resource-related heavy manufacturing demonstrate the immense potential for reducing CO2 emissions in regions lagging in input efficiency. Third, regions with a more developed industrial structure avoided local CO2 emissions by importing carbon-intensive products while exporting less carbon-intensive but higher-value-added products in the machinery and equipment and service sectors. Several policy implications are also discussed based on the main findings of this study. (C) 2013 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.envsci.2013.10.001

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合成開口レーダと建築物面積との相関性評価 Reviewed

杉本賢二，奥岡桂次郎，谷川寛樹

土木学会論文集G (環境) Vol. 70 ( 5 ) page： 79-85 2014.3

Study of Effect of Introducing Photovoltaic and Construction of Estimation Model for CO2 Emissions from Japanese Prefectures Reviewed

HASEGAWA Masatoshi, ONISHI Akio, TOGAWA Takuya, OKUOKA Keijiro, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 70 ( 5 ) page： I_157-I_165 2014

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

In aiming at continuous development, global warming is a challenge that must be acknowledged. It would be necessary to shift to the low-carbon society in order to solve this challenge. When examining the environmental load of urban structure, it is desirable to consider and analyze life cycles at various scales. In this study, we estimate future CO2 emission scenarios from Japan's prefectures. We compared the effects of energy-saving measures such as compacting of urban areas and photovoltaic systems have on the CO2 emissions.  The result for the Business As Usual (BAU) scenario was 1,985 million tons of CO2 emissions from 2045 to 2049. However, a scenario of energy saving measures reduces CO2 emissions to 1,250 million tons, a 40% reduction. It was found that the introduction of photovoltaic affected the results most significantly.

DOI： 10.2208/jscejer.70.I_157

Multi-scale assessment of floor area disparity using spatial database : An empirical study in Japan Reviewed

Hanwei Liang, Hiroki Tanikawa

Journal of International Review of Civil Engineering Vol. 5 ( 2 ) page： 48-55 2014

Exploring the Characterization of Building Stock and its Relationship with Nighttime Light Distribution in Japan : A Spatial Perspective Reviewed

Hanwei Liang, Wanxin Hou, Cherry Myo Lwin, Hiroki Tanikawa

Journal of Environmental Information Science Vol. 42 ( 5 ) page： 25-32 2014

A comparative study on assessment of economy-wide material flow accounts and its implications in Myanmar, Bangladesh, and Philippines. Reviewed

Maung, K. N, T. Komatsu, M. F. G. Martinico-Perez, C. M. Lwin, S. Mohammad, K. Sugimoto, K. Okuoka, S. Murakami, H. Tanikawa

Journal of Environmental Information Science Vol. 42 ( 5 ) page： 51 - 60 2014

夜間衛星光と合成開口レーダを用いた建物延床面積の推計モデルの開発 Reviewed

谷川寛樹

土木学会論文集G (環境) Vol. 70 2014

都道府県別CO2排出量推計モデルの構築および太陽光発電の導入効果の検討 Reviewed

大西暁生, 奥岡桂次郎, 谷川寛樹

土木学会論文集G(環境）Vol.70 No.5,地球環境研究論文集 Vol. 第22巻 2014

都市重量と循環性持続可能性評価 Reviewed

谷川寛樹

海外環境協力センター OECC会報 Vol. 72 page： 8 - 9 2014

Exploring the Characterization of Building Stock and its Relationship with Nighttime Light Distribution in Japan : A Spatial Perspective Reviewed

谷川寛樹

Journal of Environmental Information Science Vol. 42 page： 25 - 32 2014

Multi-scale assessment of floor area disparity using spatial database : An empirical study in Japan Reviewed

谷川寛樹

Journal of International Review of Civil Engineering Vol. 5 page： 48 - 55 2014

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Papers - TANIKAWA, Hiroki