以崩塌活躍性及崩塌時空熱區分析說明曾文水庫集水區崩塌長期演化時空特性

Spatiotemporal Characteristics of Landslide Evolution in the Tsengwen Reservoir Watershed from the Assessment of Landslide Activity Through Spatiotemporal Hotspot Analysis

10.29417/JCSWC.202303_54(1).0004

陳昱祺(Yu-Ci Chen)；吳俊鋐(Chun-Hung Wu)

崩塌演化 ； 崩塌復育 ； 時空熱區 ； landslide evolution ； landslide recovery ； landslide spatiotemporal hotspot

中華水土保持學報

54卷1期（2023 / 03 / 01）

38 - 47

繁體中文;英文

本研究探討曾文水庫集水區在2009年莫拉克颱風後崩塌復育，在2009年後兩年崩塌面積平均每年減少 5 km^2，2009年後2年、5年及8年內崩塌復育率達到80%、83%及87%。活躍崩塌地集中於高程1750-2000 m、坡度35°-55°、距離河川500 m範圍內，崩塌熱區分佈在集水區中上游，尤其在最上游的長谷川溪、達邦、達德安、隙頂與山美等五個子集水區具有明顯崩塌熱區分佈，大規模崩塌、蝕溝或彎曲河道兩岸區域也是時空熱區聚集位置，也是集水區尚未復育或新崩塌地分布區域。

The study explores the recovery from landslides induced by Typhoon Morakot in 2009 in the Tsengwen reservoir watershed. The landslide recovery ratios in the following 2, 5, and 8 years after 2009 reached 80%, 83%, and 87%, respectively. The active landslide was concentrated in the area with an elevation of 1750-2000 m, a slope of 35°-55°, and located within 500 m of the rivers. The landslide spatiotemporal hotspots were distributed upstream of the Tsengwen reservoir watershed, particularly in the Chankuchuan, Daban, Daderan, Siding, and Shanmei subwatersheds. The large landslide cases and the involved gullies and rivers occurred over the cluster area of landslide spatiotemporal hotspots and the distributed area of nonrecovered or new landslides.

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