圖書典藏及影音數位平台

臺灣近年來強降雨發生頻繁，每逢暴雨即可能發生大規模之土砂災害，除了威脅鄰近居民之生命財產安全外，超高濁度之泥水亦對下游蓄水取水設施之運用產生嚴重衝，由此顯示全國水庫集水區保育工作之重要，例如104年蘇迪勒颱風不僅重創烏來地區，更嚴重影響大台北地區供水之穩定度與用水品質。近年國家發展委員會審查水庫集水區保育實施計畫，即已建議需因地制宜採用多元方法改善集水區優養化問題，例如於水庫臨界處附近栽種「培地茅」等生態植物以吸納磷、氮等養份並淨化水質，兼且避免過度改變水流流速，達到加速土沙汰選與淤積作用；另外亦建議可在既有工程技術上，檢討並研擬創新模式和變革作法，俾提升集水區永續治理成效。考量近年低衝擊開發(LID)之概念蓬勃發展，國內對其應用於都市防洪之相關研究與案例漸趨成熟，惟在集水區土砂管理方面則付之闕如，有鑑於此，爰辦理本計畫以探討低衝擊開發於集水區土砂管理之適用措施，研擬其對土砂防治之成效評估架構及不確定性分析方法，並以新店溪青潭堰上游流域為例，分析集水區產砂及運移特性，探討低衝擊開發之影響以期有效實施集水區保育治理。

The low impact development (LID) concept has been widely applied and implemented in urban water management and flood control. However, its applications to sediment management and soil-water conservation in catchments are relatively scarce. For this reason, the main objective of this study is to compile LID techniques potentially useful for catchment sediment-water management and to investigate their applicability and effectiveness as influenced by uncertainties. This study will consider catchment upstream of Qing-tan weir of the Xindian River in which the sediment data in recent years in the catchment are collected and analyzed. From the preliminary investigation of sediment balance within the Xindian catchment, a study area will be identified and appropriate LID measures will be proposed for implementation.