COUNTERMEASURES FOR ILL-POSEDNESS OF IDENTIFIED PERMEABILITIES THROUGH A DISTRIBUTED MODEL AND ENHANCED SENSITIVITY OF OBSERVATION UPDATING TO IDENTIFYING SOLUTION

• HAMAGUCHI Toshio

  京都大学防災研究所

Bibliographic Information

Other Title

• 分布モデル化による透水係数同定問題の非適切性克服と解の観測更新感度向上

Abstract

This study shows that the distributed model of permeabilities in geostatistics is proposed and uniquely solved in the numerical test. A hypothetical aquifer divided into twenty piecewise zones is designed. Twenty constant-permeabilities are individually identified and some of them result in inaccurate solution. The difficulties of an inverse problem with ill-posedness prevent us from getting the stable, unique and accurate solutions of identified permeabilities. A distribution model of permeabilities mapped through geostatistics is herein proposed. A sensitivity of observation updating to the parameters to be identified is then enhanced over the whole area. The mathematical foundation for the advances of the sensitivity is also investigated and discussed. It can be proven that the proposed approach is greatly helpful in identifying a spatial distribution of piecewise permeabilities.

Journal

• PROCEEDINGS OF HYDRAULIC ENGINEERING

  PROCEEDINGS OF HYDRAULIC ENGINEERING 49 109-114, 2005

  Japan Society of Civil Engineers

Keywords

• permeability
• identification
• sensitivity of observation updating
• ill-posedness
• distributed model

Details

• CRID: 1390282680146986496
• NII Article ID: 130003842012
• DOI: 10.2208/prohe.49.109
• ISSN: 18849172
• ISSN: 09167374
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed