旗山溪集水區長期降雨特性改變與崩塌分佈關係

The Long Term Rainfall Trend and Landslide Distribution in Chishan River Watershed

10.29417/JCSWC.201212_43(4).0002

陳樹群(Su-Chin Chen)；諸予涵(Yu-Hang Chu)；吳俊鋐(Chun-Hung Wu)

旗山溪 ； 降雨特性長期變遷 ； 長期崩塌分佈 ； 集集地震 ； 莫拉克颱風 ； Chishan river watershed ； rainfall characteristic ； landslide distribution ； Chichi earthquake ； Typhoon Morakot

中華水土保持學報

43卷4期（2012 / 12 / 01）

293 - 301

繁體中文

旗山溪集水區近50年平均年降雨量增加3%至30%，降雨集中夏秋趨勢明顯。集水區崩塌誘發因素可分為三類，包含地震、降雨及河川淘刷；地震誘發崩塌除造成近山脊處崩塌外，本研究推測也造成下邊坡土體鬆動及造成土體不穩定。由2001年至2009年數據分析，集集地震對旗山溪集水區之崩塌誘發影響可能減弱；降雨及河川流量造成的崩塌，則可由2001年至2008年崩塌數據說明：豪雨集中間接促使集水區下邊坡崩塌大量增加。

The mean annual rainfall has increased 3-30% in the comparison of the rainfall records from 1961 to 1970 and from 2001 to 2008. The inducing factors for the landslide in Chishan river watershed include earthquake events, rainfall events, and the flood. The inducing influences of earthquake events to the landslide appear not only on on the steep up-hillslope, but also on the mild down-hillslope. The inducing influence of Chichi earthquake to the landslide in Chishan river watershed seems to be decreasing with progress of time, and the apparent inducing influence to the landslide on the down-hillslope due to the river scour during the heavy rainfall events can be found based on the landslide distribution from 2001 to 2008.

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