圖書典藏及影音數位平台

近年來隨著氣候變遷下的降雨空間不均與都會區人口增加，高屏溪的防洪及水資源調度逐漸受到威脅，其中高屏溪幹流荖濃溪集水區，自民國98年莫拉克颱風事件以來其支流布唐布那斯溪及玉穗溪等集水區內誘發大規模崩塌及土石流等土砂災害事件急遽增加，新生大量崩塌土體隨著水流以土石流方式持續往下游輸送，時常造成下游河道阻塞，進而影響通洪能力，並於運移過程中對河道護岸、橋梁、聯外道路及水資源取水、引水設施等造成損害。因此針對荖濃溪主河道透過NbS、減少碳排及受災能快速復原等執行策略，研擬加速清疏及強化水資源運用方案，以建立防洪減災及穩定供水之防災韌性目標。本計畫係辦理「荖濃溪防災韌性計畫」監測調查工作，於颱洪期間進行荖濃溪上游河段(斷面東河63~東河133)監測，建置自動化土砂觀測系統，進行全洪程流量及土砂通量觀測分析，觀測成果提供數值模式評估分析驗證資料，以得到監測荖濃溪上游土砂沖淤、大斷面變化、流速及輸砂量成果，並達到因應災害風險目標。

In recent years, the uneven spatial distribution of rainfall under climate change and the increasing population in metropolitan areas have posed growing challenges to flood control and water-resource management in the Gaoping River basin. In particular, within the Laonong River watershed—located along the main stem of the Gaoping River—the number of large-scale landslides and debris-flow disasters in tributaries such as the Butangbunas Creek and Yusui Creek has risen sharply since Typhoon Morakot in 2009. Vast quantities of newly generated landslide debris have been continuously transported downstream by debris flows, frequently obstructing the river channel, reducing flood-conveyance capacity, and damaging riverbank protection structures, bridges, access roads, and water-intake and diversion facilities during transport.To address these issues, this project adopts strategies consistent with Nature-based Solutions (NbS), carbon-emission reduction, and rapid disaster recovery to develop accelerated sediment removal measures and enhanced water-resource utilization plans, thereby strengthening flood mitigation, disaster resilience, and stable water supply in the Laonong River.This project implements the regular and ad hoc monitoring and data collection tasks of the “Laonong River Disaster Resilience Project.” During typhoon and flood events, monitoring is conducted along the upper Laonong River (cross-sections Donghe 63 to Donghe 133). An automated sediment-monitoring system is established to measure full-flood hydrographs and sediment fluxes. The observed data support numerical modeling for evaluation and validation, enabling the analysis of upstream sediment deposition and scour patterns, large-scale cross-sectional changes, flow velocities, and sediment transport rates. The results contribute to achieving disaster-risk reduction objectives and improving river resilience.