Faculty Profiles - TANIKAWA, Hiroki

Anthropogenic Disturbance by Domestic Extraction of Gold Mining in Mongolia Open Access

ENKHMUNKH Ganbold, YAMASUE Eiji, MIATTO Alessio, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 75 ( 6 ) page： II_285 - II_290 2019

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

Mining, husbandry, and construction activities are consuming a large amount of natural resources. These processes have multiple impacts on the environment, including the excavation of large areas. This research focuses on gold mining in Mongolia, and aims (1) to identify the gold mining activities and allocated them on a map, and (2) to quantify the material flows related to gold mining. Statistical datasets, sourced by the Mineral Resources of Mongolia and the National Statistical Office of Mongolia, were used to account for domestic extraction. Two methods were used for mapping mining activities: firstly, the degraded areas were identified through a geographic information system (GIS) software; secondly, the domestic extraction of gold mining was estimated by the standardized method of material flow accounting. Results indicate the Mongolian gold mining activities exploited 9,812 ha of land across 18 different provinces. In addition, 745,300 m3 of soil was excavated to produce 132 tons of gold in 2007-2017. Particularly, during this period 100.8 tonnes of green gold was extracted which means the gold extraction that does not include any chemical process and just washing soil to obtain gold. "Green Gold" is recognized as less environmental impact by the European market. This study will be beneficial to the Mongolian government to better understand the environmental burden related to the gold mining activities in the country.

DOI： 10.2208/jscejer.75.6_ii_285

Stagnating CO<inf>2</inf>emissions with in-depth socioeconomic transition in Beijing Reviewed

Future Estimation of Construction By-product Using Maximum Likelihood Method by 4d-GIS -Case Study of the Central Area of Nagoya- Reviewed Open Access

Masaki Kohei, Okuoka Keijiro, Tanikawa Hiroki

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 30 ( 0 ) page： 61 2019

The Assessment of Wooden Resources with Waste Input-Output Table and Forest and Urban Dynamic Model Reviewed Open Access

Yamashita Naho, Okuoka Keijiro, Tanikawa Hiroki

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 30 ( 0 ) page： 75 2019

Sustainability indicators from resource flow trends in the Philippines Reviewed

Martinico-Perez Marianne, Faith G, Schandl Heinz, Tanikawa Hiroki

RESOURCES CONSERVATION AND RECYCLING Vol. 138 page： 74 - 86 2018.11

Wang J

Applied Energy Vol. 228 page： 1714 - 1725 2018.10

Proliferation of district heating using local energy resources through strategic building-stock management: A case study in Fukushima, Japan Reviewed

Dou Yi, Okuoka Keijiro, Fujii Minoru, Tanikawa Hiroki, Fujita Tsuyoshi, Togawa Takuya, Dong Liang

FRONTIERS IN ENERGY Vol. 12 ( 3 ) page： 411 - 425 2018.9

Global Material Flows and Resource Productivity: Forty Years of Evidence Reviewed Open Access

Schandl Heinz, Fischer-Kowalski Marina, West James, Giljum Stefan, Dittrich Monika, Eisenmenger Nina, Geschke Arne, Lieber Mirko, Wiela, Hanspeter, Schaffartzik Anke, Krausmann Fridolin, Gierlinger Sylvia, Hosking Karin, Lenzen Manfred, Tanikawa Hiroki, Miatto Alessio, Fishman Tomer

JOURNAL OF INDUSTRIAL ECOLOGY Vol. 22 ( 4 ) page： 827 - 838 2018.8

The Socio-Economic Metabolism of an Emerging Economy: Monitoring Progress of Decoupling of Economic Growth and Environmental Pressures in the Philippines Reviewed

Marianne Faith G. Martinico-Perez, Heinz Schandl, Tomer Fishman, Hiroki Tanikawa

Ecological Economics Vol. 147 page： 155 - 166 2018.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier B.V.

In many Asian developing countries, policy makers face tension between the needs of economic growth, human development and environmental sustainability. In a similar vein, the new global agreement on Sustainable Development Goals (SDGs) calls for the harmonization of economic and environmental goals. To shed light on the relationship between the economy and natural resources, our research investigates the case of the Philippines, employing a material flow accounting approach based on national statistical sources. We analyze domestic extraction, trade of materials and economic development from 1980 to 2014. We also explore differences between territorial (production) and footprint (consumption) accounts. We find that the Philippine economy managed to grow while reducing material intensity because of an increasing share of services sector activities. From net resource trade dependence in the 1980s, the Philippines become a net resource provider in 2014 because of increased extraction and exports of metal ores. Overall, the material requirements grew over the past two decades at lower rate than GDP, signifying relative decoupling. The new data and indicators we present are aimed to inform the national policy agenda. They may help to formulate policies that integrate economic and environmental priorities and guide the Philippines towards achieving the SDGs.

DOI： 10.1016/j.ecolecon.2018.01.012

Anthropogenic Disturbance by Domestic Extraction of Construction Minerals in Japan Reviewed

Potential of Waste Heat Exchange Considering Industrial Location Changes: A Case of Shinchi-Soma Region in Fukushima, Japan Reviewed Open Access

Yi Dou, Minoru Fujii, Tsuyoshi Fujita, Kei Gomi, Seiya Maki, Hiroki Tanikawa

Journal of Japan Society of Civil Engineers 2018.4

Keisuke Yoshida, Keijiro Okuoka, Hiroki Tanikawa

Journal of Industrial Ecology Vol. 22 ( 1 ) page： 145 - 154 2018.2

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

Accompanying the huge amount of material accumulation in the socioeconomic sphere is anthropogenic disturbance, namely, artificial landform transformation attributed to mining, soil excavation, construction, and physical development. Anthropogenic disturbance impacts the natural environment and is strongly related to hidden material flow (HMF). However, only few studies have considered anthropogenic disturbance as the starting point of material transfer in the ecosphere. The objectives of the present study are: (1) to spatially quantify the impact of humans on the natural environment by estimating the anthropogenic disturbance attributed to mining and (2) to contribute to the knowledge of HMF by examining the phenomenon using the relatively unexplored methodology of assessing the relationship between anthropogenic disturbance and material transfer by means of a geographical information system and digital elevation model. Statistical data obtained by the Ministry of Economy, Trade and Industry of Japan were used to account for domestic extraction. By comparing the respective results of bottom-up and top-down accountings, we estimated the potential HMF. The database developed in this study not only reflects the amount of anthropogenic disturbance and potential HMF, but also reveals their destructive effect on the environment and the spatial distribution of anthropogenic disturbance.

DOI： 10.1111/jiec.12543

Feasibility of developing heat exchange network between incineration facilities and industries in cities: Case of Tokyo Metropolitan Area Reviewed

Yi Dou, Satoshi Ohnishi, Minoru Fujii, Takuya Togawa, Tsuyoshi Fujita, Hiroki Tanikawa, Liang Dong

JOURNAL OF CLEANER PRODUCTION Vol. 170 page： 548 - 558 2018.1

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

Energy conservation is critical for promoting urban low-carbon and sustainable development. Because a large amount of heat energy is wasted during energy conversion and transportation, the recovery of waste heat and its cascading use would substantially save resources and reduce CO2 emissions. As a typical case of the Tokyo Metropolitan Area, direct extracting steam from incinerators for industrial use is considered more efficient than power generation, but hard to be popularized because of long distance heat transport. On the basis of the heat atlas, this study develops an integrated model to assess the feasibility of developing heat exchange network between incineration facilities and industries in city scale, and evaluates the impacts from land use on economic and environmental indices. The result reveals that maximum 45.2% of the incineration waste heat can be utilized to cover 13.8% of the heat consumption in industries, where annual net benefit and CO2 emission reduction could achieve 63 billion JPY (approximate to 0.6 billion USD) and 2200 kt CO2/year, respectively. However, current geographic separation between incineration facilities and industries brings a dilemma between economic and environmental benefits which will obstruct the popularization of waste heat exchange. Given this result, a cluster map to classify involved incineration facilities is provided which helps in establishing a renewal strategy considering positive land use adjustment. These results are also referable in urban planning integrated with distributed energy system as well as provide a case for promoting Urban Symbiosis. (C) 2017 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jclepro.2017.09.147

Innovative planning and evaluation system for district heating using waste heat considering spatial configuration: A case in Fukushima, Japan Reviewed

Yi Dou, Takuya Togawa, Liang Dong, Minoru Fujii, Satoshi Ohnishi, Hiroki Tanikawa, Tsuyoshi Fujita

RESOURCES CONSERVATION AND RECYCLING Vol. 128 page： 406 - 416 2018.1

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

Energy shortage and global climate change have created a dilemma in Japan, especially after the great earthquake of 2011 in eastern Japan. District Heating System (DHS) using waste heat is highlighted as an attractive solution. However, because of low heat demand in urban areas and the geographic separation of industries, popularizing this solution is considerably difficult in Japan. Previous studies have focused on technical improvements on existing district heating networks, but these studies lack sufficient discussion on an early-stage integrated land-use planning. Supported by technological assessment and emerging concepts of Industrial-Urban Symbiosis (I-US), this study combines the system development of DHS and land use scenarios into a symbiotic design based on inventory survey and geographic database, and conducts a cost-benefit analysis to scientifically and quantitatively evaluate the effects brought from land-use policies. Results from a case study of Shinchi Town in the Fukushima Prefecture indicate DHS using waste heat can realize significant benefits of energy saving and CO2 reduction, provided positive guidance on land use planning is implemented. Moreover, the model framework of this study also supports a quantitative assessment on policy implementation to help in decision making on urban sustainable energy planning. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.resconrec.2016.03.006

Establishing A Building Lifespan Model and Estimating Material Stocks and Flows Using 4d-GIS in the Central Area of Nagoya Open Access

OKUOKA Keijiro, NONAKA Ikko, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 74 ( 6 ) page： II_267 - II_273 2018

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

Understanding quality and quantity of material stocks and urban metabolism, forecasting demolition waste are essential in order to establish a sound material-cycle society. The influence of socio-economic changes and geo-spatial characteristics to building lifespan are required for a detailed urban metabolism analysis. In this study, we construct an urban structure (Building, Road, Railway) database of the city center of Nagoya (approximately 12 km2) from 1949 to 2009, and we established a building lifespan model for urbam metabolism analysis considering socio-economic changes and geo-spatial characteristics parameter. As a result, we quantified the building lifespan by floor number, population density, building structure type and official discount rate. In adition, we compare and examine between the actual demolished builing data from 2003 to 2009 in Nagoya city center and result of the simulated demolished building using building lifespan model. Simulated demolished building was 4.85 Mtonnes in the actual demolished building which is 6.03 Mtonnes. Demolition judgement using building lifespan model can estimate for high rise building such as RC building.

DOI： 10.2208/jscejer.74.ii_267

Estimation of accumulation of construction material using identification of buildings in time-series in the Greater Tokyo Reviewed Open Access

ASAKUMA Tomoya, OKUOKA Keijiro, TANIKAWA Hiroki

Papers on Environmental Information Science Vol. ceis32 ( 0 ) page： 13 - 18 2018

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Center for Environmental Information Science

Toward the sound material-cycle society, it is required to understand the detailed distribution of material stock in urban areas over a wide range in time-series. This research estimated the replacement of construction material and visualized spatial information in timeseries in the Greater Tokyo. Total floor area of renewal construction materials is 112 million m2 (2003~2009), and 75.6 million m2 (2009~2015) using identification of buildings in time-series. Moreover, total floor area of demolished construction materials is 54.2 million m2 (2003~2009), and 46.4 million m2(2009~2015). The total floor area of renewal construction materials which estimated in this study was about 0.7-1.2 times and demolished construction materials was about 3 times compared to the Tokyo Metropolitan Statistical Annual Report.

DOI： 10.11492/ceispapers.ceis32.0_13

The Socio-Economic Metabolism of an Emerging Economy: Monitoring Progress of Decoupling of Economic Growth and Environmental Pressures in the Philippines Reviewed International coauthorship

谷川寛樹

Journal of Ecological Economics Vol. 147 page： 155 - 166 2018

Modeling material flows and stocks of the road network in the United States 1905-2015 Reviewed Open Access

Alessio Miatto, Heinz Schandl, Dominik Wiedenhofer, Fridolin Krausmann, Hiroki Tanikawa

RESOURCES CONSERVATION AND RECYCLING Vol. 127 page： 168 - 178 2017.12

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

Recent years have seen a growing interest in the potential for a more circular economy and the application of material flow accounting to increase knowledge on materials accumulating in in-use stocks. This study assesses the dynamics of stocks and flows related to road networks, which are a significant destination for recycled construction and demolition waste.
We develop a bottom-up stock-driven model to assess long-term inflows, outflows, and materials accumulated in roads to assess requirements for construction minerals of the road network in the United States. We estimate material requirements using the expansion of the transport network as a driver, and scheduled maintenance and technological coefficients from engineering literature to assess input and output flows. We apply the model to historical data for the United States road network from 1905 to 2015 and show that the current material stock of construction minerals in the road network of the United States is 15.1 billion tonnes, growing 21-fold since 1905.
During the 20th century, the material requirements of road construction have declined from 35% to 15% of economy-wide material consumption of non-metallic minerals in the United States. The share of roads in economy-wide in-use stocks has also declined from 17% to 13%. This shows that roads, once established, remain in place and most material flows are due to extending and refurbishing them, while the construction of completely new roads makes up a much smaller part of the material flows related to the road network.

DOI： 10.1016/j.resconrec.2017.08.024