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Variability in rainfall threshold for debris flow after the Chi-Chi earthquake in central Taiwan,China

查看全文 作　　者：C. L. [1]SHIEH;Y. S. [2]CHEN;Y. J. [2]TSAI;J. H. [3]WU 高影响力作者 机构地区：[1]Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Taiwan, China;[2]Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Taiwan, China;[3]Department of Civil Engineering, National Cheng Kung University, Taiwan, China高影响力机构 出　　处：《International Journal of Sediment Research》索引2009年第24卷第2期,共12页高影响力期刊 摘　　要：The purpose of this study is to analyze variability in rainfall threshold for debris flow(critical rainfall for debris flow triggering) after the ML 7.3 Chi-Chi earthquake in central Taiwan in 1999. Two study sites with different geological conditions were surveyed in the earthquake area. Streambed surveys were conducted to continuously monitor debris flows between 1999 and 2006. During the 7-year study period,every debris flow event was identified,and the streambed characterized. Results show that the rainfall threshold for debris flow was remarkably lower just after the Chi-Chi Earthquake,but gradually recovered. To date,this rainfall threshold is still lower than the original level prior to the earthquake. This variability in rainfall threshold is closely related to the amount of sediment material in the initiation area of debris flow,which increased rapidly due to landslides resulting from the earthquake. With the increase in sediment material,the rainfall threshold was lowered severely during the first year following the Chi-Chi earthquake. However,heavy rainfalls mobilized the sediment material,causing debris flows and transporting sediment downstream. With the decrease in sediment material,the rainfall threshold recovered gradually over time. Furthermore,debris flows occurred only in the subbasins that had sufficient sediment material to cause significant movement. Hence,these results confirm that the sediment material in the initiation area of debris flow is a crucial component of the rainfall threshold for debris flow. 关 键 词：地震发生 泥石流 台湾地区 门槛 降雨 变异 中国
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