海岸沙坝近底悬移质通量实验研究  

Experiment study on near-bed suspended sediment flux on bared beach

作　　者：吴国强[1] 邹志利[1] 张海飞[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《海洋工程》2013年第1期1-8,共8页The Ocean Engineering

基　　金：国家自然科学基金资助项目(51079024);国家创新群体基金资助项目(50921001)

摘　　要：为了研究海岸沙坝的产生和演化机理,对不规则波和波群作用下沙坝上方的近底悬移质通量进行了实验研究。分析了短波、长波和平均水流对悬移质通量的影响。结果表明:各种波况下平均水流和长波的作用始终使泥沙向离岸方向输移,而短波的作用使泥沙向岸方向运动;平均水流引起的泥沙输移始终占主要成分,长波的次之。不规则波情况下平均水流的影响较规则波的情况相对较弱,三种成分对泥沙输运的贡献属于同一量级。波群情况下长波的影响随着波浪群性的增强而加大,短波的不明显,而平均水流的影响则随着波浪群性的增强而减弱。The laboratory experiment on wave-induced suspended sediment flux near the bed at the location of bared beach was conducted in order to investigate the generation and evolution mechanism of a sand bar.Wave groups with different modulations and irregular waves were adopted in the experiment.The contributions of gravity and infragravity waves and mean currents were analyzed.The results for these wave conditions show that the sediment transport due to mean current is dominant and always offshore;the onshore flux is at the basic wave frequency and the offshore flux is at the infragravity wave frequencies.In the case of the wave groups,the contributions of gravity and infragravity waves increase with the increasing of the wave amplitude modulation,but the contribution of the mean currents decreases.For the irregular wave case,the contributions of mean currents,gravity waves and infragravity waves have the same order of magnitude as those for wave group cases.

关 键 词：悬移质通量 沙坝 平均水流 短波 长波 波群 

分 类 号：TV149.2[水利工程—水力学及河流动力学]