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中文摘要：
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。
英文摘要：
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.
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