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地理科学  2011 

汛期洪水弃水与水土流失耦合风险关系分析

, PP. 1138-1143

Keywords: 汛期洪水弃水,水土流失,耦合风险,信息熵,泾河流域

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Abstract:

暴雨洪水是导致流域水土流失的一个重要因素,水土流失又会引起径流泥沙含量的增加,使汛期洪水弃水量加大,成为汛期洪水灾害发生的重要原因。以泾河流域为例,根据信息熵理论和USLE模型,提出约束信息量因子BI和水土流失耦合风险概念及其计算式,建立汛期洪水弃水系数与水土流失耦合风险等级之间的关系式,结果表明①泾河张家山站以上流域1986、1995和2000年的水土流失耦合风险等级呈现出递减的趋势,分别为2.544、2.542和2.472;②汛期洪水弃水系数与水土流失耦合风险等级之间存在着显著正相关关系。

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