地下水人工补注池.pdfVIP

濾度 A Study on the Influence of the Filter Layer of an Artificial Recharge of Groundwater Basin on Infiltration Velocity 利 Ting Cheh-Shyh Chien, Ching-Tun Chiu, Teng-Pao 來 塞便理 50 料濾行濾度 量 度 9,000 CMD 16.17 m/day 4.7 m/day 粒塞降度 濾利 粒 粒度 來 50 濾料率行 50 度 濾料 Abstract This study is directed at artificial recharge of groundwater projects to be carried out in the future. To prevent the pond bottom from silting up, and for the convenience of cleaning, a pilot pond was designed to simulate a 50 cm gravel filter layer. The experiment attempts to explore how the filter layer affects infiltration velocity after water is channelled in for recharge. This experiment took a total of 17 days, of which 7 days were for ordinary recharge testing and after that 10 days were for the testing of sand silting. The recharge amount was about 9,000 m3/day and the average infiltration velocity decreased from 16.17m/day to 4.7 m/day. The cause of this decrease is that after sand was replaced the fine-grained soil began to clog the pores, thereby retarding the infiltration velocity. The filter layer was subsequently divided and sampled and then, drawing on a soil grain size distribution graph, an analysis was conducted to obtain a fine-grained soil silting depth of about 50 cm. This experiment shows that if artificial recharge of groundwater is to