中文摘要：

沙坝是波浪作用下砂质海岸地貌的主要表现形态之一,对于海滩的动力稳定状态具有重要的指示意义。从沙坝的形态参数、沙坝形成理论、沙坝迁移的动力机制以及数值模拟方法等方面概述了水下沙坝横向迁移的研究进展和存在的不足。虽然国内外学者对沙坝横向迁移进行了大量研究,然而由于海滩复杂的动力过程以及沙坝迁移与泥沙输运之间的耦合作用,目前仍存在许多问题尚待解决,未来进一步研究的方向主要包括沙坝迁移过程的空间差异、沙坝迁移的临界条件、波浪破碎对近底泥沙运动和沙坝迁移的影响、数学模型的改进以及沙坝迁移与泥沙输运的耦合机制等方面。

英文摘要：

Sandbars are the main morphological features of many wave-dominated sandy coasts and their dynamic behavior can serve as an important indicator for assessing beach stability. This paper presents a review of the progress and problems of the research on the cross-shore migration of nearshore sandbars including the bar-shape parameters,the formation theories,migration mechanisms and the methods of numerical simulation. Although considerable research on sandbar migration has been carried out by researchers both in China and abroad,there are still many problems that remain to be solved due to the complexity of dynamic processes involved,especially the coupling process between sediment transport and sandbar migration. The review highlights areas for further studies,which include differences in spatial characteristics of sandbar migration,the threshold of sandbar migration,the influence of breaking waves on near-bottom sediment transport,sandbar migration,the improvements of numerical models and the interaction mechanism between sediment transport and sandbar migration.