石門水庫集水區防砂設施囚砂量調查及淤砂坡降評估

為瞭解「石門水庫及其集水區整治計畫」五大集水區整治工程內具防砂性能構造物之結構物現況、受損情形、囚砂量與現地河床淤砂坡降及土砂控制情形，本研究透過防砂設施現況調查及工程基礎資料，並搭配防砂量估算方法，概算現場實際攔阻量及囚砂區之剩餘壩容，以具體化說明保育措施治理前後之執行成效與效益。經調查成果顯示，防砂設施並無明顯受損且影響功能者，而評估良好及尚可者，佔全數比例89.5%及10.5%；此外，各設施之淤砂程度以中淤砂程度（淤砂高度介於1/3壩高與2/3壩高之間）佔52.4%最大。此外，庫區集水區之總囚砂量最大，達90.88萬立方，佔總囚砂量約56%，集水區可發揮攔砂功能之防砂設施可囚砂量131.9萬立方，經評估尚可達到保土蓄水之功效；另同時開發具地理資訊平台之視窗化管理程式，供未來分析應用及定期執行健檢工作。

關鍵字

石門水庫；囚砂量；淤砂坡降；維護管理模糊

並列摘要

In order to clarify sediment control, sediment storage, bed slope, structural integrity and performance conditions of check dams built as part of the remediative works associated with the ”Shih-men Reservoir Watershed Remediation Plan”, this study incorporates field data from on site investigations with designed dimensions into sediment retention estimates which include the amount of trapped sediment and remaining sediment storage volume. The sediment retention estimates are used to quantitatively evaluate the effectiveness of check dams. Results of the study reveal that few check dams have been damaged and the majorities are working at satisfactory levels. ”Favorable” graded structures and ”Acceptable” graded structures account for 89.5% and 10.5% respectfully. Regarding the level of sediment deposition, 56% of the check dams were found to be at a medium level (Thickness of sediment deposit is between 1/3 and 2/3 of the height of the dam). The largest volume of sediment was found to be stored in the reservoir area, where in total, 908,800 m3 of sediment is stored, accounting for 56.31% of the total storage volume. Approximately 1319,000 m3 of storage volume remains, a volume indicative of upstream sediment retention and water storage capabilities. In addition to on site measurements, this study also developed a geo-referenced data management system to help with future management and investigation projects.

並列關鍵字

Shih-Men Watershed ； sediment storage volume ； Fuzzy Inference

國際替代計量

石門水庫集水區防砂設施囚砂量調查及淤砂坡降評估

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