福姜沙河段输沙、边滩输移特征和动力机制研究  

Characteristic and dynamic mechanism of sediment and beach transport in Fujiangsha reach

作　　者：刘高峰 王统泽 LIU Gao-feng;WANG Tong-ze(Shanghai Estuarine and Coastal Science Research Center,Shanghai 201201,China)

机构地区：[1]上海河口海岸科学研究中心,上海201201

出　　处：《水运工程》2020年第11期94-99,共6页Port & Waterway Engineering

基　　金：国家重点研发计划项目(2016YFC0402101)。

摘　　要：通过分析2010-2015年福姜沙河段历年地形和水文资料,开展定床物理模型铺沙冲刷试验,采用三维潮流泥沙数学模型,研究福姜沙河段的边滩泥沙输移问题。结果表明,切割沙体移动速度和其驱动因子(如径流、沙体高程和沙体迎水面角度)呈正相关;靖江边滩是以冲刷下移还是切割下移方式运动的临界流量为4万m 3 s。靖江边滩-福左水道是主要底沙输移通道。上游流量是福姜沙河段输沙方式变化和河床演变的主要动力因子。小流量时福中水道为主要输沙通道;而大流量福北水道是主要输沙通道。大流量持续作用下会有更多泥沙进入福北水道,福北水道易出现大幅淤积。We analyze the surveyed terrain and hydrodynamic data in Fujiangsha reach from 2010 to 2015,carry out the sediment transport experiment on fixed bed physical model,apply a three dimension tidal hydrodynamic and sediment transport model to study sediment transport of beach in Fujiangsha reach.The results show that the transport speed of cutting beach shows positive correlation with the driven factors,such as discharge,the height of beach and upstream face angle.The critical discharge which Jinjiang beach transport after eroded integrally or downstream part cutting off is 40,000 m 3 s.The water area from Jinjiang beach to Fubei waterway is the main bed-load transport channel.The upstream discharge is the main hydrodynamic factor which determines the sediment transport pattern in Fujiangsha reach and river bed evolution.Fuzhong channel is the main path for bed-load transport at small discharge,and Fubei channel is the main path for bed-load transport channel at huge discharge.Severe siltation in Fubei channel will appear since much sediment transport into Fubei channel at condition of huge sustained discharge.

关 键 词：径潮流分汊河段 边滩切割输移 底沙输移模式 动力机制 

分 类 号：TV142[水利工程—水力学及河流动力学] U612[交通运输工程—船舶及航道工程]