Faculty Profiles - TANIKAWA, Hiroki

Papers - TANIKAWA, Hiroki

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EMPIRICAL RESEARCH OF RESOURCE PRODUCTIVITY DECOMPOSITION CONSIDERING MATERIAL STOCK -CASE STUDY OF JAPAN’S RESIDENTIAL BUILDINGS-

YAMASHITA Naho, GUO Jing, SHIRAKAWA Hiroaki, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 77 ( 6 ) page： II_23 - II_31 2021

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

Resource productivity is a material flow index that is set as a major goal of the Fundamental Plan for Establishing a Sound Material-Cycle Society, but it could not well evaluate the indirect impact of the material stock that supports the material flow. A few of existing studies have conducted the resource productivity decomposition with material stock factors though, it is difficult to apply the same fashion to all types of material stock whose value greatly varies depending on its usage. In this study, we mainly considered the factors of Japan’s housing material stock, to clarify the impact of changes in housing stock on the resource productivity. The results show that the resource productivity is negatively impacted by the decrease of the service provided with a unit of housing stock and the increase of vacant houses from 2008 to 2017, while it can be improved through the prolonging the housing lifetime.

DOI： 10.2208/jscejer.77.6_ii_23

CiNii Research

Life cycle assessment of cleaner production measures in monosodium glutamate production: A case study in China Reviewed International coauthorship

Dong Yang, Xuexiu Jia, Mengyuan Dang, Feng Han, Feng Shi, Hiroki Tanikawa, Jiří Jaromír, Klemeš

Journal of Cleaner Production Vol. 270 page： 122126 2020.10

日本全国の利用度別物質ストックの定量化 -住宅におけるケーススタディ- Reviewed

谷川寛樹, 山本大陸, 山下奈穂, 白川博章

土木学会論文集 G（環境） Vol. 76 ( 6 ) page： 9 - 16 2020.10

衛星夜間光情報に基づく深層学習による建築物の延べ床面積推計に関する研究 Reviewed

齋藤隆成、平井千津子、芳賀智宏、松井孝典、白川博章、谷川寛樹

土木学会論文集 G（環境） Vol. 76 ( 6 ) page： 1 - 7 2020.10

A spatiotemporal urban metabolism model for the Canberra suburb of Braddon in Australia Reviewed International coauthorship

Heinz Schandl, Raymundo Marcos-Martinez, Tim Baynes, Zefan Yu, Alessio Miatto, Hiroki Tanikawa

Journal of Cleaner Production Vol. 265 page： 121770 2020.8

Urban Buildings Material Intensity in China from 1949 to 2015 Invited Reviewed International coauthorship

Yang Dong, Jing Guo, Lingwen Sun, Feng Shi, Jingru Liu, Hiroki Tanikawa

Resources, Conservation and Recycling Vol. 159 page： 104824 2020.8

CO2 emissions from the Chinese cement sector: Analysis from both the supply and demand sides Reviewed International coauthorship

Du, T; Wang, J; Wang, HM; Tian, X; Yue, Q; Tanikawa, H

JOURNAL OF INDUSTRIAL ECOLOGY Vol. 24 ( 4 ) page： 923 - 934 2020.8

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Industrial Ecology

China is the largest producer and consumer of cement worldwide, and cement production entails the release of substantial carbon dioxide (CO2) emissions. As the cement sector is a crucial sector of the Chinese economy, understanding the role of supply- and demand-side factors may help accelerate efforts to mitigate CO2 emissions. However, few studies have analyzed the critical factors affecting CO2 emissions in the sector based on a combined supply- and demand-side perspective. In this study, we developed an integrated framework that included eleven indicators covering both the supply and demand sides. Results revealed that improving cement production technology cannot offset CO2 emissions from the growth in demand for cement. Improving technology on the supply side would considerably reduce CO2 emissions from Chinese cement production; nevertheless, the combination of rapid urbanization, GDP growth, and an ultra-high fixed capital formation ratio on the demand side increased CO2 emissions nearly 25-fold from 1990 to 2015. Notably, some demand-side factors also had an effect that reduced CO2 emissions. The in-use stock per unit of fixed capital formation and output per in-use stock reduced CO2 emissions by 332 million metric tons, which is comparable to the contribution of technological progress. Based on these results, we examine why these demand-side factors substantially influence CO2 emissions in the Chinese cement sector, and we provide recommendations for policy-makers on carbon-reduction measures in this CO2-intensive sector.

DOI： 10.1111/jiec.12986

Web of Science

Scopus

Understanding and managing vacant house in support of a material stock type society-The case of Kitakyushu,Japan Invited Reviewed International coauthorship Open Access

Wendy Wuyts, Raphael Sedlitzky, Masato Morita, Hiroki Tanikawa

Sustainability Vol. 12 ( 13 ) page： 5653 2020.7

Challenges towards carbon dioxide emissions peak under in-depth socioeconomic transition in China: Insights from Shanghai Reviewed International coauthorship

Shangwei Liu, Xin Tian, Yiling Xiong, Yan Zhang, Hiroki Tanikawa

Journal of Cleaner Production Vol. 247 page： 119083 2020.2

Lost Material Stock in Buildings due to Sea Level Rise from Global Warming: The Case of Fiji Islands Reviewed International coauthorship Open Access

Merschroth, S; Miatto, A; Weyand, S; Tanikawa, H; Schebek, L

SUSTAINABILITY Vol. 12 ( 3 ) 2020.2

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

This study developed a methodology to estimate the amount of construction material in coastal buildings which are lost due to climate change-induced sea level rise. The Republic of Fiji was chosen as a case study; sea level rise is based on predictions by the Intergovernmental Panel on Climate Change for the years 2050 and 2100. This study combines the concept of a geographic information system based digital inundation analysis with the concept of a material stock analysis. The findings show that about 4.5% of all existing buildings on Fiji will be inundated by 2050 because of an expected global sea level rise of 0.22 m (scenario 1) and 6.2% by 2100 for a sea level rise of 0.63 m (scenario 2). The number of buildings inundated by 2050 is equivalent to 40% of the average number of new constructed buildings in Fiji Islands in a single year. Overall, the amount of materials present in buildings which will be inundated by 2050 is 900,000 metric tons (815,650 metric tons of concrete, 52,100 metric tons of timber, and 31,680 metric tons of steel). By 2100, this amount is expected to grow to 1,151,000 metric tons (1,130,160 metric tons of concrete, 69,760 metric tons of timber, and 51,320 metric tons of steel). The results shall contribute in enhancing urban planning, climate change adaptation strategies, and the estimation of future demolition flows in small island developing states.

DOI： 10.3390/su12030834

Open Access

Web of Science

Scopus

Estimation of the amount of disaster waste generated by Nankai Megathrust Earthquake:comparison with previous research Reviewed

NOZUE KOSUKE, Yazawa Taishi, Okuoka Keijirou, Tanikawa Hiroki, Hashimoto Seiji

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 31 ( 0 ) page： 107 2020

QUANTIFICATION OF IN-USE MATERIAL STOCK RATE - CASE STUDY OF JAPAN’S RESIDENTIAL BUILDINGS -

TANIKAWA Hiroki, YAMAMOTO Hiromu, YAMASHITA Naho, SHIRAKAWA Hiroaki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 76 ( 6 ) page： II_9 - II_16 2020

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

For the establishment of Recycling-based Society, Stock-type Society becomes increasingly important. Material stock plays an important role in the society and serves someone well in one way, whereas it has inevitable impact on material flow. For the reason that material stock is inextricably linked with material flow, the excess material stock can induce unnecessary resource input and increase waste generation from obsolete stock. To bring down high-quality material stock for the future generation, proper management of materials stored or hibernating in the society is required. In order to grasp the status of stock, material stock should be estimated and evaluated with in-use rate. In this study, by the method of lifespan modeling approach, material stock in Japan’s residential buildings and the amount of that obsolete stock/in-use stock were estimated. As a result of the estimation, there were 5.2 billion tons of residential building in 2018. In the amount of material stock in empty houses out of residential buildings, the amount of obsolete stock was estimated at 0.3 billion ton. As the number of residential building keeps increasing, the amount of obsolete stock is expected to increase in future.

DOI： 10.2208/jscejer.76.6_ii_9

CiNii Research

DEVELOPMENT OF A METHOD OF ESTIMATION OF TOTAL FLOOR AREA USING DEEP LEARNING BASED ON NIGHTTIME-LIGHT DATA

SAITO Ryusei, HIRAI Chizuko, HAGA Chihiro, MATSUI Takanori, SHIRAKAWA Hiroaki, TANIKAWA Hiroki

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Vol. 76 ( 6 ) page： II_1 - II_7 2020

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

In order to achieve the recycling society worldwide, it is important to analyze material stock and flow on a global scale and understand their accumulation trends and patterns. World-wide satellite images data is easily and quickly accessible, and it breaks the restriction of statistical data. Recently, Convolutional Neural Network (CNN) is received a lot of attentions as a technique in the analysis of satellite images. Our study made efforts to develop an advanced model for estimating the total floor area of buildings based on night light data using CNN. Three major metropolitans in Japan (Tokyo, Osaka, and Nagoya metropolitan area) were selected as the estimation areas and the learning areas, setting one metropolitan as learning area to estimate the buildings floor areas for the other two. And same procedure has been done three times as each metropolitan was changed to be learning area in turns. Additionally, we verified the accuracy of results to examine the effectiveness of our model. In the case of “Osaka learning for Nagoya estimation”, it was clear that the total floor area of buildings in Nagoya metropolitan area was 450 million m2, which is close to the real value and indicates our model can be useful?

DOI： 10.2208/jscejer.76.6_ii_1

CiNii Research

Extending or ending the life of residential buildings in Japan: A social circular economy approach to the problem of short-lived constructions Reviewed International coauthorship

Wendy Wuyts, Alessio Miatto, Raphael Sedlitzky, Hiroki Tanikawa

Journal of Cleaner Production Vol. 231 page： 660 - 670 2019.9

Transferability of Material Composition Indicators for Residential Buildings: A Conceptual Approach Based on a German-Japanese Comparison Reviewed

Schiller, G; Miatto, A; Gruhler, K; Ortlepp, R; Deilmann, C; Tanikawa, H

JOURNAL OF INDUSTRIAL ECOLOGY Vol. 23 ( 4 ) page： 796 - 807 2019.8

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Industrial Ecology

Most anthropogenic material stocks and flows are associated with the building sector. Several recent studies have developed material composition indicators (MCIs) suitable for calculating material stocks and flows of the building sector using bottom-up approaches, which hold great potential to provide information to support resource efficiency policies. A major limitation is the lack of country-specific MCIs. This study aims to introduce a concept for a better transferability of MCI across different contexts by proposing requirements for defining MCIs and to discuss options and limits of the transferability. We take existing MCIs for residential buildings in Germany and Japan as case studies and make them comparable by applying harmonization methods. Based on that, similarities and differences are systematically identified and discussed, considering their socioeconomic, cultural, technical, and environmental factors. Our results indicate significant limitations to the transferability of MCIs for detached houses, while bigger apartment complexes show greater homogeneity despite the very different environments in which they are constructed. This indicates that while it is possible to assume foreign MCIs as plausible for large constructions, local coefficients need to be estimated for smaller single-family homes.

DOI： 10.1111/jiec.12817

Web of Science

Scopus

Spatially explicit material stock analysis of buildings in Eastern China metropoles Reviewed International coauthorship

Jing Guo, Alessio Miatto, Feng Shi, Hiroki Tanikawa

Resources, Conservation and Recycling Vol. 146 page： 45 - 54 2019.7