Considerations on the moisture dependence of evaporation efficiency in unsaturated soil using laboratory test results and water tank tests, and a proposal of a consept model for evaporation parameter

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06213
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Kagoshima University
• Principal Investigator: SAKO Kazunari 鹿児島大学, 理工学域工学系, 准教授 (20388143)
• Co-Investigator(Kenkyū-buntansha): 里見 知昭 東北大学, 環境科学研究科, 助教 (80588020)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 不飽和土 / 蒸発効率 / 斜面安定

Outline of Final Research Achievements

In this research, the relationships between volumetric water content and evaporation efficiency β of unsaturated sandy soil were discussed based on experimental results. Firstly, the improved experiment method for the moisture exchange speed was proposed, the evaporation efficiency of unsaturated soil were obtained. The characteristics of evaporation efficiency were detail explained. Comparing with the conventional experimental method proposed by Kondo et al. and our proposed experimental method, the effect of the volumetric heat capacity for evaporation efficiency could be observed. A concept model for evaporation efficiency was also proposed. The parameter for evaporation efficiency can be derived from the proposed model using the grain size distribution and void ration. Then, the validity of the concept model was checked comparing with calculation results and experimental results. Finally, the improvements of the concept model were discussed.

Free Research Field

地盤工学