Identification of preferential water flow under the ground through dynamic response of seepage water

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K15006
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Rural environmental engineering/Planning
• Research Institution: Kyoto University
• Principal Investigator: Fujisawa Kazunori 京都大学, 農学研究科, 准教授 (30510218)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: パイピング / ベイズ推定 / Dacy／Navier-Stokesカップリング / ハミルトニアンモンテカルロ法

Outline of Final Research Achievements

This research project has developed a method for detecting localized cavities or voids under the ground, such as crack and soil pipe, through the dynamic response of seepage flow. The following two main results were obtained in the project: We developed a numerical method which achieve the coupled analysis of saturated/unsaturated seepage flows in porous media and Navier-Stokes flows in fluid domain, and proposed a new method identifying the clear interface of spatial domains, such as subsurface cavities via Bayesian inference.

Free Research Field

農業農村工学、地盤工学、応用力学

Academic Significance and Societal Importance of the Research Achievements

上記の二つ研究成果はその汎用性の広さに特徴がある．水みちを有する浸透水の流れの計算では，水だけで占められた流体領域と土中の不飽和・飽和浸透流を同時計算できる．これは，地上に存在するほとんどの形態の水の流れを連続的に予測できる方法となる．また，局所的な空洞形状の逆解析法は，ベイズ推定に形状微分を取り入れた新規なものであるだけでなく，これまで困難であった明確なインターフェースを推定することが可能である．そのため，明瞭な境界形状を必要とする多くの形状推定問題に適用できる．