皇甫川流域水沙变化特点及其趋势分析

Analysis of Changing Characteristics and Tendency of Runoff and Sediment Transport in Huangfuchuan River Watershed

以地处多沙粗沙区的皇甫川流域为例,采用实测资料,对其水沙量进行了统计分析。采用滑动平均法、Mann-Kendall非参数秩次相关检验法,对控制站皇甫站水沙变化趋势进行了研究。结果表明:在一定显著性水平下,皇甫川流域径流与泥沙在多年变化中均呈明显下降趋势。最后,针对影响水沙变化的降水与人类活动因素,应用不同时段的雨-水-沙关系,结合双累积曲线的变化过程,定量计算了不同时段的水沙衰减量以及由于雨水衰减影响和水土保持影响的减沙量所占比重。

This paper statistically analyzes the runoff and sediment transport of the Huangfuchuan river watershed in more sediment and coarse sediment region of the Yellow River, through Several nonparameter statistical methods such as the moving average check, the Mann-Kendall test. The paper concludes that the trend of runoff evolvement and sediment transport at the Huangfu station decreased are very distinct. The major factors correlated with the runoff and sediment transport changes such as the rainfall, soil conservation. With the relationships between rainfall, water and sediment, and the accumulation curves of the mass runoff and mass sediment transport at Huangfu station. The sediment descending proportions caused by the reduction of rainfall and soil conservancy are respectively evaluated.