鄱阳湖入出湖水沙通量演变及输沙量归因分析

Analysis on the Evolution of Water and Sediment Fluxes into and out of Poyang Lake and the Attribution of Sediment Transport

基于鄱阳湖“五河”控制站及湖口站1956—2020年径流量及输沙量数据,利用数理统计法和“水文法”研究入、出湖水沙通量的变化趋势,定量分析径流变化和人类活动对入、出湖输沙量的影响程度。结果表明:(1)修河年径流量显著增加,赣江、信江年输沙量显著减少,饶河虎山站年输沙量显著增加。(2)径流量变化对赣江、信江、修河年输沙量变化呈负贡献,对饶河年输沙量变化呈正贡献,人类活动对各河流年输沙量变化均呈正贡献。(3)入湖输沙量、人类活动变化分别对出湖输沙呈正、负贡献。

Based on the annual runoff and sediment transport data from 1956 to 2020 at the"Five Rivers"control station and Hukou station of Poyang Lake,this paper studied the change trend of water and sediment flux into and out of the lake by means of mathematical statistics and"hydrology",and quantitatively analyzed the impact of runoff changes and human activities on the sediment transport into and out of the lake.The results show that:(1)The annual runoff of Xiuhe River increased significantly,the annual sediment discharge of Ganjiang River and Xinjiang River decreased significantly,and the annual sediment discharge of Raohe Hushan Station increased significantly.(2)The change of runoff has a negative contribution to the change of annual sedi-ment discharge of Ganjiang River,Xinjiang River and Xiuhe River,a positive contribution to the change of annual sediment dis-charge of Raohe River,and human activities have a positive contribution to the change of annual sediment discharge of each river.(3)The sediment discharge into the lake and the change of human activities have positive and negative contributions to the sediment discharge out of the lake.