波浪-海流-微地形耦合的沉积动力模式建立及应用

发布时间：2018-10-26 21:55

【摘要】：沙纹微地形普遍存在于海底,沙纹的消长能改变底部应力进而影响泥沙的运移。以往研究较多侧重于波致沙纹,并已应用于波浪模式的底摩擦计算,而较少考虑波流联合效应产生的沙纹,也未将其应用于综合的水动力模式和沉积物输运模式。本文在POM水动力模式中嵌入新南威尔士大学泥沙模式,通过耦合波流共同作用的微地形模型与波流相互作用底边界层模型,发展了波浪-海流-微地形(沙纹)耦合的沉积动力模式。本文将该模式应用于澳大利亚Jervis湾,针对波主导和波流联合主导沙纹两种类型,分别进行了沙纹发展状态、几何形态的分布及悬浮泥沙的模拟。结果表明:波致沙纹比波流联合作用的沙波具有更大的波高和波长,因此当波主导时沙纹对悬浮泥沙起着关键作用。通过考虑随沙纹变化的粗糙度,相比于以往模式设置均一的粗糙度,该模型能对悬浮物浓度的骤升过程进行更精细的预测。
[Abstract]:Sand grain microtopography generally exists on the bottom of the sea, and the change of sand grain can change the bottom stress and then affect the sediment transport. The previous studies have focused on the sandstriation caused by Yu Bo, and have been applied to the calculation of the bottom friction of the wave model, but it has not been applied to the integrated hydrodynamic model and sediment transport model. In this paper, the sediment model of the University of New South Wales is embedded in the POM hydrodynamic model. A wave-current-microtopography (sand grain) coupled sedimentary dynamic model has been developed. In this paper, the model is applied to Jervis Bay, Australia. For the two types of wave-dominated and wav-current combined dominant sand stripes, the development state, geometric form distribution and suspended sediment simulation are carried out respectively. The results show that the wave-induced sand ripple has a higher wave height and wavelength than the wave-current combined effect, so the ripple plays a key role in suspended sediment when the wave is dominant. By considering the roughness with the variation of sand grain, the model can predict the concentration of suspended solids more accurately than the former model with uniform roughness.
【作者单位】：中国海洋大学海洋与大气学院;国家海洋局第一海洋研究所海洋环境科学和数值模拟国家海洋局重点实验室;
【基金】：国家自然科学基金项目(41072176) 中央级公益性科研院所基本科研业务费专项(2014T01,2015P03) 国家重点研发计划课题(2016YFC0503602,2016YFB0201103,2017YFA0604101,2017YFA0604104) 留学回国人员科技活动项目择优资助
【分类号】：P736.21

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