圖書典藏及影音數位平台

阿公店水庫集水區大部分為青灰泥岩地形，質地鬆軟且吸水易化，每遇颱風豪雨即造成庫區大量沉滓運移入庫，自民國42年水庫開始運轉以來，每年約有50萬立方公尺之淤砂量淤積於庫底，至民國80年時，水庫淤積率已達71%。民國86年起辦理「阿公店水庫更新工程計畫」，進行水庫浚渫清淤1,160萬m3，庫區有效容量回復至1,837萬立方公尺，並改建溢洪管及灌溉管，實施空庫防淤操作以大量減少洪水時之沉滓落淤，以永續維持水庫之有效容量。然在水文、地文、泥砂運移等因素均具有相當高不確定性的情況下，上述更新工程的空庫防淤運轉規則，應可進一步依據實際操作成效進行檢討，以提升排砂效率。例如，由近年來防淤操作之觀察，在排洪通道地處於庫區邊陲位置，出流量有限(最大85 cms)的現況條件下，空庫防淤的成效實有取決於入庫泥砂的運移型態之現象；更新改善後的供水模式及操作運轉規劃則與影響水量與水質的水文、地文因子息息相關。因此，需要更深入的了解阿公店水庫更新改善工程完工後水庫空庫防淤操作的成效，藉由現場量測與水庫泥砂運移模式的分析，釐清入庫水砂在水庫內之運移、沖淤和分佈的規律，以提供本局後續推動提升阿公店水庫空庫防淤效率之管理策略擬定之參考依據。

In order to realize the desiltation efficiency after finishing the renewal project, the transport, deposition and concentration distribution of the inflow sediment within the storage area of the Agondian Reservoir has been studied through on-site survey and numerical modeling. The results will be provided as the reference for promoting desiltation efficiency and management strategy. 761 samples were taken at the existent hydrological stations during 4 heavy rain events including “0519” event, typhoon SOULIK, typhoon TRAMI and typhoon KONG-REY. The released sediment amount is less than that of the past years. A part of the taken samples were analyzed by dry method. The results are similar to that by pycnometer method. Turbidity test were also done for those samples. It suggests a linear correlation between the results and that by pycnometer method.