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- 2015

二次流对急弯河段水沙输移影响的数值模拟 Modeling effects of secondary flow on transport of flow and sediment in a sharply curved channel

邓春艳,夏军强,宗全利,邓珊珊

Keywords: 二次流,水沙输移,急弯河段,下荆江,Delft3D模型

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Abstract:

弯曲河段中因二次流运动引起的横向输沙是引起崩岸的重要因素之一.为研究急弯河段中二次流运动对水沙输移的影响,以下荆江石首急弯河段为例,运用能考虑二次流影响的Delft3D模型对其进行计算,并用实测水沙资料验证模型的可靠性.在此基础上,详细分析了二次流运动对流速及含沙量分布的影响,同时分析了不同位置处二次流附加应力项、水面比降项及阻力项的相对大小关系.计算结果表明:考虑二次流后,能更有效地模拟弯道处的环流水力特性及横向输沙特性;二次流对水沙输移的影响效果在急弯河段十分突出,只有当来流流量足够小时,才能忽略二次流的影响

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