- 期刊
地下水人工補注入滲動態之試驗研究
An Experimental Study on Infiltration Dynamics for Artificial Recharge of Groundwater
摘要
地下水人工補注現場試驗，其主要的目的為了解經由引取地表水灌注人工補注池後，其入滲速度及地下水丘變化情況及補注池水補注至地下含水層後水量大小對地下水蓄存及流動之機制。 本試驗時間為17天，其中14天為一般補注試驗，之後3天為加泥砂試驗。補注水量平均約為10,000CMD，池水位盡可能保持於1.7m，平均入滲速度為15.2m/day，在加泥砂試驗後，其最終入滲速度遞減至5.3m/day。遞減原因為細顆粒土壤阻塞礫石層孔隙降低原有入滲速度。再者利用土壤水分特性曲線，求得細顆粒土壤的淤積深度為35公分。由試驗成果得知影響入滲速度的因數依序為：含砂量、池水位、蓄水體積、埋水深、水質指標(SAR)。
並列摘要
Artificial recharge of groundwater using infiltration basin at Wanlong Farm, Pingtung Plain, the purpose of the study program is to gain a better understanding of recharge system, infiltration rate and added groundwater amount after conveying surface water to the infiltration basin. From the designed full scale excavation area with the maximum amount of water needed to maintain a constant water level in the basin estimated ed to be 10,000 CMD, water supply was performed for 1.7 days, 14 days was the normal recharge test, the other 3 days was sand added test, an average infiltration rate was 15.2m/day, after the sand added test, the infiltration rate was declined from 15.2m/day to 5.3m/day. The clogging is the main factor of the infiltration rate reducing from the study. Using the soil characteristic curve by the pressure plate to find out fine sediment penetration depth is greater than 35cm in a gravel filter. The use of grain size filter has been designed a good performance during the operation of groundwater recharge in terms of sediment trap efficiency and maintain the permeability of underlying aquifer. According to outcomes of the experiment, the factor that affect the infiltration rate from the most to the least are sediment charge; level of the infiltration basin; capacity; depth between groundwater level and basin level; Sodium Adsorption Ratio respectively.