摘要
为科学指导闽江下游水土流失治理与水资源开发,基于大樟溪流域下游永泰水文站1982—2023年间数据,探究了研究区水沙分布状况与变化趋势、多时间尺度上的周期特征以及气候变化与人类活动的相对贡献率。结果显示:该流域的径流量与输沙率在2003年发生突变;大樟溪流域的水沙变化主要受到降雨量与侵蚀性降雨的影响;与基准期(1982—2002年)相比,变化期(2003—2023年)的径流量减少了21.6%、输沙率减少了60.7%,丰枯交替特征显著;人类活动是导致水沙量减少的主导因素,受其影响的水沙减少量占比均超过95%,变化期的水体含沙量降低。综上,大樟溪流域在1982—2023年间的水沙均呈减少趋势,输沙率减少更显著,人类活动应成为该流域未来水沙治理与开发策略的重点。
To scientifically guide soil erosion control and water resource development in the lower Minjiang River,data from the Yongtai Hydrological Station(1982—2023)in the lower Dazhangxi River Basin were analyzed to exa-mine the distribution and temporal trends of water and sediment.Cyclical characteristics were also investigated across multiple time scales,and the relative contributions of climate change and human activities were quantified.The results reveal an abrupt change in both runoff and sediment transport rate in 2003.Runoff dynamics were primarily influenced by total rainfall,while sediment transport was mainly controlled by erosive rainfall.Compared to the baseline period(1982—2002),the change period(2003—2023)exhibited a 21.6%reduction in runoff and a 60.7%decrease in sediment transport rate,with marked wet-dry alternations.Human activities were the dominant factor driving these reductions,accounting for over 95%of the decreases in both water and sediment.Sediment concentration also declined during the change period.In summary,both water and sediment loads in the Dazhangxi River Basin showed decreasing trends from 1982 to 2023,with a more pronounced decline in sediment transport rate.Thus,human activities should be prioritized in future strategies for water and sediment management and deve-lopment in the basin.
作者
王前锋
童奕铭
颜华玲
杨筱凡
WANG Qianfeng;TONG Yiming;YAN Hualing;YANG Xiaofan(College of Environmental&Safety Engineering,Fuzhou University,Fuzhou 350116,China;Soil and Water Conservation Science and Education Park,Fujian Agriculture and Forestry University,Fuzhou 350002,China)
出处
《华南师范大学学报(自然科学版)》
北大核心
2025年第5期69-80,共12页
Journal of South China Normal University(Natural Science Edition)
基金
福建省自然科学基金项目(2021J01627)
福建省水利厅科技项目(GK2023018)。
关键词
大樟溪流域
径流量
输沙率
趋势分析
影响因素
Dazhangxi River Basin
runoff
sediment transport rate
trend analysis
influential factors
