某水电站库区泥石流易发性及危险性评价

Susceptibility and Risk Assessment of Debris Flow in a Hydropower Station Reservoir Area

对某水电站坝址区7条泥石流沟进行了泥石流易发程度判别,并进一步采用危险性指数和危险度2种方法对7条泥石流沟危险性进行了判别。分析得出:骆驼沟、水卡子沟、呷拉沟和巴旺沟的泥石流易发程度为轻度易发,邛山沟、木尔罗沟和燕耳岩沟的泥石流易发程度均为易发,其中以木尔罗沟为最易发,基于危险性指数评价得到的危险性与基于危险度评价得到的泥石流危险性等级略有不同,按危险度评判,骆驼沟和邛山沟泥石流危险性高,木尔罗沟、水卡子沟和燕耳岩沟泥石流危险性中等;呷拉沟和巴旺沟泥石流危险性低。

The susceptibility degrees of 7 strips of debris flows in a hydropower station reservoir area were distinguished. Then the method of risk index and risk degree was used to distinguish the risk of 7 strips of debris flows. It was found after analysis that the debris flow susceptibility degree of Camel Gully,Shuikazi Gully,Jiala Gully and Bawang Gully is light; the debris flow susceptibility degree of Qiongshan Gully,Muerluo Gully and Yaneryan Gully is easy-happening,the most susceptibility degree is Muerluo Gully,secondly is Qiongshan Gully. The debris flow risk grade evaluating by risk index is slightly different from that by risk degree. According to the assessment by risk degree,the Camel Gully and Qiongshan Gully have higher risk; the Muerluo Gully,Shuikazi Gully and Yaneryan Gully have medium risk;Jiala Gully and Bawang Gully have lower risk.