• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Basic Study on Evaluation Method Soil Moisture in Small-Scale Basin

Research Project

Project/Area Number 13650559
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionKitami Institute of Technology

Principal Investigator

NAKAO Takashi  Kitami Institute of Technology, Dept. of Civil Engineering, Research Assistant, 工学部, 助手 (60101523)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordspendular water / spherical particle model / suction / Moisture characteristic curve / Numerical Simulation / 土壌水分特性曲線 / 配位数 / 不飽和浸透流 / 流出解析
Research Abstract

It is well known that the movement of water in a soil can be described by unsaturated flow equations. The relationship between suction and water content is needed to solve these equations, and this relation can be obtained through indoor experiments. The water retained in pores among particles with radii in the range of 10^<-3> mm to 1 mm can be regarded as comprising most of the free water. The free water forms a pendular ring between two particles under unsaturated conditions due to surface tension acting on the free water. The pendular ring depends on the geometrical configuration of two particles. In this paper, a conceptual model for evaluation of the suction and water retention volume among spheres with different radii is proposed from a microscopic viewpoint. The results of quantitative analysis using this model are presented. In order to calculate the suction and water retention volume in natural soil, the coordination number of a particle must be determined. Assuming that the particle size distribution and porosity are known, the average coordination number can be estimated.
The results of the proposed model agree well with the experimental results in the case of relatively low water content. However, as the proposed method focuses on only isolated pendular rings between two particles, it is impossible to extend our method to the higher water content region.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 中尾隆志, 藤田睦博: "球形粒子モデルを用いた土壌内保水機構に関する微視的解析"水文・水資源学会誌. 16-1. 56-68 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 中尾隆志, 藤田睦博: "球形モデル法による水分特性曲線の推定に関する研究"土木学会北海道支部論文報告集. 58. 354-357 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. NAKAO, M. FUJITA: "Microscopic Analysis of the Suction and Water Retention Volume in Unsaturated"J. JAPAN SOC. Hydrol. & Water Resour.. Vol. 16, No. 1. 56-68 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. NAKAO, M. FUJITA: "Estimation of Water retention Curve by Using Spherical Particle Model Method"Proceeding of Hokkaido Chapter of the Japan Society of Civil Engineers. No. 58. 354-357 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 中尾隆志: "球形粒子モデルを用いた土壌内保水機構に関する微視的解析"水文・水資源学会誌. 16・1. 56-68 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 中尾隆志, 藤田睦博: "球形モデル法による水分特性曲線の推定に関する研究"土木学会北海道支部論文報告集. 第58号. 354-357 (2002)

    • Related Report
      2001 Annual Research Report

URL: 

Published: 2001-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi