Acta Scientiarum Naturalium Universitatis Pekinensis

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Hazard Assessment of Debris Flow Based on Geomorphic InformationEntropy in Catchment

WANG Xiaopeng1, PAN Mao1, REN Qunzhi2   

  • Received:2006-04-27 Online:2007-03-20 Published:2007-03-20



Abstract: Debris flow is the special disaster occurred in the catchments, which is controlled by the geomorphic system. The theory of geomorphic information entropy which can be used to indict the characteristics of evolution of landforms is the combination of information and Strahler's area-altitude analysis. So, it is possible to use geomorphic information entropy to study debris flow catchments and make hazard assessment of debris flow catchments. This paper carries the geomorphic information entropy analysis on the geomorphologic evaluation stage of 21 debris flow catchments in Hadabei, which is located in the southwest part of Xiuyan County with damaged debris flows in 1982. According to the result, the geomorphic information entropy analysis on debris flow catchments is objective, credible, easy to carry out and helpful for evaluation, warning and reduction of debris flow.

Key words: debris flow, geomorphic information entropy, hazard assessment

摘要: 泥石流是爆发在山区小流域内的特殊地质灾害,流域地貌条件制约着泥石流的形成和运动,影响着泥石流的发生和规模,因此,可以根据流域地貌的发育阶段判断泥石流的危险性。流域系统地貌信息熵理论是Strahler面积-高程分析法与信息熵原理的有机结合,是计算流域地貌发育阶段的定量方法。作者探讨了利用流域系统地貌信息熵理论进行泥石流危险性评价的方法,并选取辽宁省岫岩县哈达碑镇的21条流域作为实例进行验证。评价结果表明,利用地貌系统信息熵值来判断泥石流的发育程度,具有较好的客观性、可操作性和可靠性。

关键词: 泥石流, 地貌系统信息熵, 危险性评价

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