1994 Fiscal Year Final Research Report Summary

Estimating Method of Recharging Groundwater from River or Lake

Research Project

Project/Area Number	05650483
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	Geotechnical engineering
Research Institution	Osaka Institute of Technology
Principal Investigator	AOKI Kazuo Osaka Institute of Technology, Faculty of Engineering, Associate Professor., 工学部, 助教授 (20111916)
Co-Investigator(Kenkyū-buntansha)	AYA Shiro Osaka Institute of Technology, Faculty of Engineering, Associate Professor., 工学部, 助教授 (00026361)
Project Period (FY)	1993 – 1994
Keywords	Grounwater recharge / Salt intrusion / Unsaturated sand / FEM
Research Abstract	The Main object of this study is clarify the groundwater recarging properties from river or lake. The results is as follows ; (1) We develope a new automatic measuring apparatus that can monitor the conductivity inside a bore hole at various depths over time. (2) The salt intrusion can be measured by the wenner method of the electric prospecting. (3) Chemical hysteresis between adsorption and desorption process is found by the laboratory test. It is revealed that adsorption process is generated by the ion exchange and the effect of electrolytic concentration and desorption process is only affected by electrolytic concentration decreasing. (4) The numerical analysis of unsaturated-saturated flow problem is carried out for solving groundwater recharging properties from river. The recharging volume of groundwater from river can be calculated by FEM.

(6 results)