Effects Of Unsaturated Soil Parameters On The Effectiveness Of Well Recharge

• Main Authors: Bei-Xiang Guo, 郭倍翔
• Other Authors: Pei-Hsun Tsai
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/02945341654258777410

碩士 === 朝陽科技大學 === 營建工程系 === 102 === The distribution of rainfall is not uniform in Taiwan due to geographical and climatic condition. It happens that a lot of underused rainwater flows into the sea. When the consumption of water for aquaculture and agriculture increases, groundwater can be ultra-pumping. It will be the reason for reducing groundwater level, invading seawater, and soil settlement. Therefore, how to perform groundwater recharge effectively is an important issue. It is a coupled mechanical-seepage flow analysis in unsaturated soil for groundwater recharge. ABAQUS software was used to simulate a recharge well in a layer of aquifer. Parametric studies of recharge effectiveness were evaluated in this study. The influencing parameters include relative density of aquifer, the depth of recharge well and the values of unsaturated soil parameter α and n of van Genuchten model. The effects of these parameters on the amount of recharge and ground surface uplift were studied. The result shows that the amount of recharge increases and the duration of recharge decreases when relative density of aquifer reduces. The amount of uplift of ground surface increases due to the decrease of relative density. The duration of recharge is shorter and the amount of uplift of ground surface is large when the depth of recharge well is deeper. In unsaturated soil parameter of van Genuchten model, the amount of recharge and ground surface uplift are larger, the duration of recharge is longer when the values of α or n are small. The effect of the value of n on ground surface uplift is more than that of the value of α.