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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 and sediment flow and sediment change in the outcrop of Gan River in the lower reaches of Ganjiang River, the change of water and sediment was analyzed by Mann-Kendall trend test based on measured data. Based on the surveying and mapping data of Peripheral Hydrology Station over the years, Cross-section topography method to calculate the amount of scour and silting in the control section, and analyze the correlation between erosion and siltation and sediment. The results show that in the recent years, the coefficient of sediment decrease and the river reach is more obvious in the outer alluvial river, which is mainly due to the common influence of river closure and human sand mining activities in Wan’an Reservoir. The research results can provide guidance for the development of Ganjiang River and Poyang Lake.