摘要
基于20世纪60年代以来珠江最大干流——西江网河年均流量、输沙率、河道地形及表层沉积物粒度等数据,分析西江网河演变规律,探讨其河床演变对人类活动的响应。结果表明,20世纪80年代后西江网河整体处于冲刷状态,20世纪90年代河道采砂活动导致河床下切,分流分沙比降低,同时上游新水库建设致使来沙量持续下降,两者加剧了网河河道冲刷。由于采砂活动导致沉积物细化,以及水库拦截了粗颗粒泥沙,21世纪10年代西江网河表层沉积物较1998年细化69.6%。相关因素共同作用导致河道于21世纪10年代仍处于冲刷状态。
Based on data of flow and sediment,channel topography and surface sediment grain size since the 1960s in the West River Network(WRN),the channel evolution of the WRN has been analyzed.In addition,the evolution response of the WRN to human activities has been explored.Results indicate that the river channel was eroded after the 1980s,especially during the 1990s,and sand excavation caused the riverbed downcutting and changes in the diversion of flow and sediment ratio in the WRN.Meanwhile,the construction of new reservoirs in the upstream caused decline of sediment discharge continuously.The effects of sand excavation and the reservoir construction in the upstream jointly enhanced the channel erosion in the WRN.Furthermore,the refinement of surface sediment,induced by sand excavation and the trapping coarser sediment by reservoirs,caused the surface sediment finer in the WRN during the 2010s,and the rate of finer was 69.6%comparing with that in 1998.All factors above jointly led to scouring in the WRN during the 2010s.
作者
张子昊
李嘉怡
刘锋
杨清书
ZHANG Zi-hao;LI Jia-yi;LIU Feng;YANG Qing-shu(School of Marine Sciences,Sun Yat-sen University,Guangzhou 510275,China;Institute of Estuarine and Coastal research,School of Marine Engineering and Technology,Sun Yat-sen University,Guangzhou 510275,China)
出处
《泥沙研究》
CSCD
北大核心
2020年第3期61-66,共6页
Journal of Sediment Research
基金
国家自然科学基金项目(41706088,41476073)
国家重点研发计划项目(2016YFC0402600)
广东省自然科学基金项目(2017A030310435)
广东省水利科技创新项目(2016-21)
中山大学高校基本科研业务费青年教师培育项目(18lgpy29)。
关键词
西江网河
人类活动
河道地形
沉积特征
West River Network
human activities
river morphology
deposition characteristics
