河龙区间水沙变化特点及减水减沙量分析

研究计算了河口镇—龙门区间水土保持治理后和近期的降雨、天然径流量、实测水沙量以及降雨径流关系、水沙关系的变化。结果表明:各因子普遍减小,近期的减幅大于治理后;对于近期,降雨量的减幅最小,沙量的减幅最大;各因子的减少主要发生在汛期,更集中在主汛期;主汛期降雨径流关系未发生显著变化,而近期同样实测水量条件下沙量明显减少。根据水文法初步估算了各因素的减水减沙量,分析了降雨和人类活动因素对减水减沙的作用及其随研究时期的变化规律。

Characteristics and Reductions of Water and Sediment in Areas from Hekouzhen to Longmen

It studies and calculates the rainfall,natural runoff,amount of water and sediment and the variations of rainfall-runoff relationship and the relation between water and sediment in short-term and after the treatment of soil and water conservation in the areas from Hekouzhen to Longmen.The outcomes show that each factor reduces universally and short-term amount of cut is greater than that after treatment;the decrease range of rainfall is the minimum and sediment is the maximum in short-term;the decrease of each factor mainly occurs in flood season and mostly concentrated in the main flood season;the rainfall-runoff relationship of the main flood season has not changed obviously,while the amount of sediment reduces obviously under the same water condition in short term.It preliminarily estimates the water and sediment reduction of each factor and analyzes the action of rainfall and human activities to water and sediment reduction and the variation law of the study period according to hydrologic law.