嘉陵江流域泥沙输移量变化影响因素分析

Analysis of influential factors of variation trend of sediment transport of Jialing River Watershed

影响嘉陵江流域悬移质水沙输移的因素众多,且不同规模的河流水沙输移量级差异很大。采用水沙经验关系幂函数公式、多元回归分析和主成分分析法,基于流域内12个代表性水文站长序列日平均水沙、气象数据以及GIS技术等,分析得到了该流域在天然状态下和受水库拦沙作用后的水沙输移关键影响因子和相互关系。通过参数敏感度计算,揭示了不同因素对该流域水沙输移的影响程度和机理,为未来流域产流产沙的变化趋势研究提供科学参考依据。

The sediment transport in Jialing River Watershed is influenced by many factors, the runoff and sediment transport of different scale rivers varies significantly. The empirical power function formula nf runoff and suspended sediment and the muhi -regression and Principal Component Analysis （PCA） were used to analyze the key factors of runoff and suspended sediment transport and the relationship among them, in the natural condition and the condition after the sedimentation interception by reser- voir respectively, on the basis of daily hydrologic and meteorological data of 12 stations in Jialing River Watershed. The research discovered the influential degree of various factors on runoff and suspended sediment transport and the mechanism, which can provide information for assessing the long - term suspended sediment varying trend of Jialing River Watershed in the future.