Correlation Analysis of Water and Sediment in Jinshajiang River Mainstream and Tributaries of Yunnan Plateau
The Jinshajiang River Basin in Yunnan Province covers the main economic and political regions of the prov-ince.The Tiger Leaping Gorge section of the Jinshajiang River is the water source area of the central Yunnan water diver-sion project under construction.The correlation analysis of water and sediment in the main and tributaries of the Jin-shajiang River in the Yunnan Plateau is of great significance for revealing the law of regional water and sediment and ensu-ring the safety of water sources.Based on the observation data of flow and suspended sediment concentration of control stations in the main stream and typical tributaries of Jinshajiang River Basin in Yunnan Province,this paper systematical-ly analyzes the rules and characteristics of interannual and intra-annual distribution,spatio-temporal encounter and syner-gistic change of water and sediment by using stochastic hydrology,trend analysis and Copula functions.The results show that the annual distribution of flow and suspended sediment concentration in the main and tributaries of Jinshajiang River in Yunnan Province is uneven,and the positive correlation between flow and suspended sediment concentration is not completely synchronized.The probability of continuous high water/sediment events is greater than that of continuous low water/sediment events,but the continuous impact of the former is weaker than that of the latter.The asynchronous probability of runoff and sediment encounter is greater than the synchronous probability.The co-occurrence return period of the combination of abundant water and sediment is the largest,the joint return period is the second,and the conditional return period is the smallest.
water-sediment relationshipCopula functionrecurrence periodencounter analysisYunnan plateauJinshajiang River
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