Unveiling the interaction between pore structure and pore-fluid flow in landfills using topological data analysis

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K00594
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: Center for Environmental Science in Saitama
• Principal Investigator: Suzuki Kazuyuki 埼玉県環境科学国際センター, 資源循環・廃棄物担当, 専門研究員 (70379824)
• Research Collaborator: Suito Hiroshi
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 廃棄物最終処分場 / 埋立層 / 間隙構造 / 数値シミュレーション / パーシステントホモロジー / パーシステント図 / 位相的データ解析

Outline of Final Research Achievements

The fluid flow dynamics of the landfill affect the micro-structure of pores in the waste-filled layer. However, there was no adequate method to represents the shape of complicated pore geometries. Recently, topological data analysis (TDA) has been developed as a new approach to characterize the shape of data quantitatively and has been applied to various practical problems such as materials science. In this study, persistent homology and its persistence diagram were used as TDA to analyze the pore structure in waste materials. Persistence diagram was calculated from the data of micro X-ray computed tomography (CT) images of waste materials such as bottom ash and incombustible residue. Then, the pore-fluid flow in waste materials was calculated using CFD. Finally, we investigated relationship between obtained geometry parameters using TDA and simulated pore flow dynamics in landfill.

Free Research Field

廃棄物工学

Academic Significance and Societal Importance of the Research Achievements

本研究の位相幾何学的なアプローチは、廃棄物最終処分場のみならず、同様の多孔質材料に適用可能と考えられ、環境、材料科学、資源開発等、幅広い分野への展開が期待される。