An Evaluation Study on the Subsurface Flow at the Right Bank of Kaoping River

• Main Authors: Chen Yung-Ming, 陳勇銘
• Other Authors: Ting Cheh-Shyh
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/31699756726216027077

碩士 === 國立屏東科技大學 === 土木工程系所 === 95 === This study discusses the feasibility of water collection using infiltration pipes under riverbeds. In Taiwan, there are a number of related cases to discuss, such as the Jhuliao Watersupply Station on the right bank of Kaoping River in Dashu, Jioucyutang Watersupply Station, and Zauming Watersupply Station in Daliau. The Liukwei and Baolai Water Treatment Plants built upstream the Launong River are similar cases as well. To obtain a sufficient amount of better quality water, the following factors should be considered: river flow rate, turbidity, thickness of the filtering layer, river realignment, riverbed sediment, blocked issues of infiltration pipes, degradation of filtering materials, and the fluctuation of water levels. In this study, the Numerical Model will be applied for simulation and prediction to discuss: (1) water collection methods with infiltration pipes, (2) various depths for buried infiltration pipes, and (3) various lengths for buried infiltration pipes. The simulation results show that, in terms of water collection capacity, the best results are obtained with the vertical layout, followed by the radial layout and rectangular layout; the parallel layout showed the worst result. For water collection length, 28,299 CMD, the average amount of water collected, is the best result as the length reaches 520m. While for the buried depth, 28,099 CMD, the average amount of water collected, is the best result when the buried depth reaches 20m. For hydraulic conductivity (K1), 26,157 CMD, the average amount of water collected, is the best result when K1 is set to 30m/day. The simulation results for each water collection method indicate that the more water will be collected as the buried depth and length increase. The best results are obtained in terms of water collection capacity when pipes are buried 15m underground.