感潮河段丁坝局部冲刷三维数值模拟  

3D numerical modeling of local scour processes around spur dikes in tidal rivers

作　　者：张新周[1] 窦希萍[1] 王向明[1] 王惠民[2] 赵晓冬[1] 徐雪松[1] 

机构地区：[1]南京水利科学研究院港口航道泥沙工程交通行业重点实验室,江苏南京210024 [2]河海大学环境学院,江苏南京210098

出　　处：《水科学进展》2012年第2期222-228,共7页Advances in Water Science

基　　金：国家自然科学基金资助项目(51079088);水利部公益性行业科研专项经费资助项目(200801016)~~

摘　　要：针对局部冲刷和一般冲刷的不同,建立了考虑垂向水流作用的局部冲刷三维紊流泥沙数学模型,并对往复流和单向流作用下的丁坝局部冲刷进行了验证计算和数值模拟。结果表明,往复流作用下丁坝局部冲刷在冲刷过程和冲淤形态上与单向流有明显不同,若采用单向流作用下的局部冲刷模型试验结果来指导往复流作用下丁坝头防护工程的设计和施工是不利的。Accurate prediction of maximum scour depth at groin heads has always been the key concern for the design of spur dikes.The simulation of flow and sediment transport processes around spur dikes in tidal rivers often involves the application of three-dimensional hydrodynamic models.In this study,a three-dimensional（3D） turbulence model is developed to simulate the sediment transport around spur dikes in tidal rivers.Using the 3D model,the local scour processes around spur dikes are simulated under both tidal current flow and unidirectional steady flow conditions.The result shows that both local scour processes and resulting scour patterns under the two conditions are significantly different from each other.It is thus important to correctly identify the flow conditions for the design and construction of spur dikes.

关 键 词：往复流 单向流 局部冲刷 数值模拟 

分 类 号：TV147.5[水利工程—水力学及河流动力学]