论文部分内容阅读
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。
Rainstorm and flood are one of the important factors leading to soil and water loss in the basin. Soil and water loss will cause the increase of runoff and sediment content, which will increase the amount of flood water during flood season and become an important cause of flood disaster in flood season. Taking Jinghe River Basin as an example, this paper proposes the concept and calculation formula of constrained information volume factor BI and soil erosion risk according to information entropy theory and USLE model, establishes the relationship between flood water abandonment coefficient and risk level of water and soil loss coupling, The results show that: (1) the coupled risk levels of soil and water loss in 1986, 1995 and 2000 in the upper reaches of Zhangjiashan Station in Jinghe River show a declining trend, which are respectively 2.544, 2.542 and 2.472; ② Coupling risk level of flood water abandonment coefficient with soil and water loss There is a significant positive correlation between.