维持河口冲淤平衡洪水流量阈值研究  

Study of threshold flood discharge for balance of sediment transport in estuary

作　　者：彭涛[1] 陈晓宏[2] 陈志和[2] 王高旭[3] 杜建[2] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]中山大学水资源与环境研究中心,广东广州510275 [3]南京水利科学研究院,江苏南京210029

出　　处：《泥沙研究》2011年第2期9-14,共6页Journal of Sediment Research

基　　金：国家自然科学基金重点项目(50839005);"十一五"国家科技支撑计划课题(2006BAB14B07)

摘　　要：针对河口入海径流匮乏和海相来沙淤积的特点,引入纳潮回淤法计算漳卫新河河口年均纳潮淤积量,在此基础上,利用河口一维水沙数学模型模拟不同洪水条件下的河道冲淤量,建立洪峰流量与河道冲淤量的回归关系,确定了维持河口冲淤平衡洪水流量阈值。结果表明,漳卫新河河口年均纳潮淤积量36.7万m3,维持河口冲淤平衡的洪峰流量阈值为772.1m3/s、相应的5日平均流量为318.9m3/s。研究为河口冲淤平衡洪水流量计算提供了一种新的思路和方法。Due to the scarcity of upstream freshwater inflow and silting induced by incoming sediment from the sea area,a method to calculate the annual average sedimentation amount in the Zhangweixin River Estuary（ZRE） is introduced.On the basis of the calculation,the scouring and silting amounts under different flood conditions are simulated by using a 1-D mathematical model for flow and sediment transport in the ZRE.The regression relationship between the peak discharge and scouring and silting amount is established.Finally,the threshold flood discharge for balance of sediment transport is determined.The results show that the annual average sedimentation amount induced by tidal flows is 0.367 million m3 in the ZRE,the threshod flood discharge for balance of sediment transport is 772.1m3 /s,and the corresponding average water discharge in 5 days is 318.9m3 /s.The paper provides a new idea and method for calculation of threshold flood discharge for balance of sediment transport in estuaries.

关 键 词：闸下淤积 冲淤平衡 洪水流量 阈值 漳卫新河河口 

分 类 号：TV148[水利工程—水力学及河流动力学]