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依据1956~1996年的资料,计算出了无定河流域历年的人工沉积汇、侵蚀量、泥沙输移比,进行了时间序列分析,并运用回归分析方法,建立了统计关系,揭示了无定河流域人工沉积汇对泥沙输移比的影响。研究表明,无定河流域侵蚀量和产沙量有明显的减小趋势;人工沉积汇先是增大,达到峰值后再减小;泥沙输移比先减小而后增大。这说明,无定河泥沙输移比的时间变化趋势,主要受人工沉积汇的控制。建立的多元回归方程表明,坝地面积增大对流域泥沙输移比减小的贡献最大;地表径流系数减小对流域泥沙输移比减小的贡献居第二位;在3个降水因子中,最大30日降水的贡献最大,汛期降水次之,最大1日降水再次之。在坡面措施和沟道措施中,沟道措施对流域泥沙输移比减小的影响要大于坡面措施。
Based on the data from 1956 to 1996, the artificial sediment sink, erosion amount, sediment transport ratio over the years in the Wudinghe River Basin were calculated, and the time series analysis was carried out. The statistical relationship was established by using regression analysis method, which revealed that no Effect of Artificial Sediment on the Sediment Delivery Ratio in Dinghe River Basin. The results show that the erosion and sediment yield of the Wudinghe River Basin have obvious decreasing trend. The artificial sediment sink firstly increases and then decreases after reaching the peak value. The sediment transport ratio decreases first and then increases. This shows that the trend of temporal change of sediment transport in Wuding River is mainly controlled by artificial sediment sink. The established multiple regression equation shows that the increase of dam area contributes the most to the decrease of sediment transport in the river basin while the decrease of the surface runoff coefficient has the second largest contribution to the decrease of sediment transport in the basin. Factor, the largest contribution of precipitation on the 30th largest precipitation second highest in the flood season, the largest again on the 1st of precipitation. In the slope measures and channel measures, the channel measures have a greater impact on reducing the sediment transport than the slope measures.