孤立波作用下岸滩剖面变化成因的水动力数值分析  

Hydrodynamic numerical study on the reasons of beach profile change under solitary wave

作　　者：蒋昌波[1,2] 邓涯 陈杰[1,2] 邓斌[1,2] 刘静[1] 沈超[1,3] 

机构地区：[1]长沙理工大学水利工程学院,长沙410004 [2]水沙科学与水灾害防治湖南省重点实验室,长沙410004 [3]中交第二航务工程勘察设计院有限公司,武汉430071

出　　处：《水动力学研究与进展（A辑）》2014年第6期713-722,共10页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(51239001和51409022);高等学校博士学科点专项科研基金新教师类资助课题(20124316120003);湖南省教育厅资助科研项目(13B130);水沙科学与水灾害防治湖南省重点实验室开放基金(2013SS08)~~

摘　　要：该文基于Open FOAM开源程序包建立波浪数值水槽,对孤立波在斜坡上的水动力特性进行模拟。运用实验数据验证了数学模型的精度和可靠性,进一步研究岸滩剖面变化的成因,并分析冲刷区不同位置泥沙颗粒所受水流冲量的变化规律,发现地形冲刷变化与水流的冲量作用为正相关,回落过程中水流冲量大于上爬过程,因而冲刷主要发生在回落过程。探讨淤积区泥沙颗粒的受力特征,发现由于水跃过程中漩涡作用,中层水流的泥沙颗粒出现向上受力,泥沙颗粒由底部回落水流向上部水流转移,水跃后期泥沙颗粒受力方向为向岸向下,岸滩最大淤积位置出现在水跃中水体涡量最大时的临近向岸区域。The hydrodynamics of solitary wave on beach was numerical simulated by the OpenFOAM open source packages to study the reasons of beach profile change. The accuracy and reliability of numerical model were verified with theexperimental data. The tendency of flow impulse on sediment was investigated in erosion zone, and the positive correlation between beach profile change and flow impulse was found. Erosion mainly took place in the beach berm when the wave backwashed, because flow impulse on sediment when backwash was larger than that when run-up. The force on the sediment in deposit zone was discussed to investigate the mechanism of sediment movement. The sediment got the upward force in middle flow, because of the vortex during the hydraulic jump. Sediment moved from the bottom to the top. In the later period of hydraulic jump. Force on the sediment was shoreward and downward. Therefore, the maximum deposition took place near the shoreward region where the vorticity of flow was maximal.

关 键 词：孤立波 岸滩剖面 冲量 OPEN FOAM 

分 类 号：TV139.2[水利工程—水力学及河流动力学]