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題 名 | 荖濃溪懸浮載輸運現象之模擬研究=Simulation of Suspended Sediment Transport for the Lao-Nung River |
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作 者 | 徐碧治; 陳金諾; 黃金山; 蔡長泰; | 書刊名 | 臺灣水利 |
卷 期 | 58:2=230 2010.06[民99.06] |
頁 次 | 頁22-35 |
分類號 | 443.47 |
關鍵詞 | 懸浮載; 地文性土壤沖淤模式; 荖濃溪; 水資源利用; 產砂量; Suspended sediment; PSED; Lao-Nung River; Water-resources uses; Sediment yield; |
語 文 | 中文(Chinese) |
中文摘要 | 荖濃溪為高屏溪之主要支流,洪水時之懸浮載濃度高,懸浮載輸運量大,影響水質而不利於水資源利用。本研究應用地文性土壤沖淤模式 (PSED-model) 演算並分析荖濃溪六場豪雨期間的洪水及懸浮載現象,以應用於研擬水資源利用對策。 以六龜水文站之流量歷線及懸浮載輸運率範圍之演算結果與量測記錄比較尚頗一致;演算之懸浮載濃度歷線與懸浮載輸運率歷線之性質亦與相關文獻之觀測分析結果相同,顯示地文性土壤沖淤模式可應用於模擬荖濃溪之懸浮載現象。分析六龜站之懸浮載輸運現象,有兩項性質可應用於有類似集水區之河流水資源利用: 1. 降雨停止後,懸浮載濃度在數小時內便會降至5000 ppm以下,流量為100-600cms,可引取供淨水廠處理的公共給水。 2. 強烈而集中之颱風豪雨雖會造成大產砂量,但主要在洪峯前輸運。對於承接山區颱洪之水庫,若在洪峯入庫前採用蓄清排渾或側渠排砂,可有效減淤而維護庫容,且能儲蓄洪峯後之水資源以供利用。 因此,應用數學模式演算集水區土壤沖蝕及河流懸浮載輸運現象,可應用於掌握川流水資源之取用時機及水庫排砂時機。惟因數學模式參數品質會影響演算結果之可靠度,故需搜集良好的量測資料以檢定模式參數,提升模擬演算結果之精確度。 |
英文摘要 | High suspended sediment concentration of the Lao-Nung River, which is the major tributary of the Kao-Ping River, has been observed during floods. Water quality of streamflows is significantly affected by the high concentration of sediment transport and thus harmful to water supplies. This study aims to use physiographic soil erosion-deposition model (PSED model) to investigate the relationship between flood flows and suspended sediment transport of the Lau-Lon River for six storms. The obtained results from the PSED model have good agreements with the recorded data of the Liu-Kwei gauge station, which imply that the PSED model can be used to simulate suspended sediment transport of the Lao-Nung River. There are two derived conclusions can be applied to water-resources uses of a watershed similar to the situation of the Liu-Kwei gauge station. 1. The suspended sediment concentration and the streamflow would decline to 5000 ppm and 100-600 cms, respectively, in a few hours after rainfall ceased. Streamflows satisfying such criteria can be diverted to the water treatment plants for domestic demands. 2. The sediment load produced from severe and concentrated rainfall is mainly distributed in advance of the flood peak. Thus, flushing muddy inflows or releasing sediment by side-channel before flood peak can efficiently reduce sediment trapped in reservoirs. Use of the PSED model to simulate the soil erosion and suspended sediment transport for a watershed is useful to determine suitable time periods for streamflow diversion of domestic demand and sediment flushing of reservoir operation. However, the results depend upon the accuracy of parameters, which need reliable field observations to calibrate parameters used in the model in order to have precise estimations. |
本系統中英文摘要資訊取自各篇刊載內容。