赣江下游外洲河段水沙特性及冲淤演变分析

Analysis of Water-Sediment Characteristics and Erosion-Deposition in Waizhou Reach of Downstream of Ganjiang River

为分析赣江下游外洲河段水沙特性及冲淤变化,基于实测资料采用Mann-Kendall趋势检验法分析水沙变化,基于外洲水文站历年测绘资料,对外洲断面进行套绘分析,采用断面地形法计算控制断面冲淤量,并分析冲淤量与来水来沙量的相关关系。结果表明,外洲河段近年来沙系数减小,河段冲刷较为明显,主要原因为受万安水库截流与人类采砂活动的共同影响。研究成果可为赣江和鄱阳湖的开发提供指导。

In order to analyze the characteristics of water sediment and deposition in Waizhou reach of downstream of Ganjiang River,based on the measured data,Mann-Kendall trend test was used to analyze the variation of water sediment.The painted analysis of Waizhou section was carried out based on surveying and mapping information collected from many years data in Waizhou hydrological station.The amount of erosion and deposition in control section were calculated by section area difference method.The relationship between water and sediment conditions was analyzed.The results show that the sediment coefficient of Waizhou reach is decreasing gradually,and the main reason of obvious river erosion is due to the interaction of Wanan reservoir closure and sand extraction activity.The study results can be applied in the instruction of development of Ganjiang river and Poyang lake.