中文摘要：

利用数值模拟方法研究围涂促淤方案,能为工程的科学决策提供有力的技术支撑。本文采用了考虑波浪及其破碎作用的波浪辐射应力、波流底切应力、波流挟沙力、破波切应力描述泥沙运动机制,构建了多因素数学模型,对温州浅滩二期围涂促淤方案进行了数值模拟研究。研究表明：1）促淤方案实施后,不会大范围改变周边海域的潮流动力特征,仅在拟建促淤堤附近水域潮流变化明显,不会明显改变南、北口涨落潮流量而影响其分流比,对周边水域基本上没有影响;2）促淤区内流速普遍减小,流速减小有利于泥沙的落淤,促淤区普遍淤积,方案1、方案2平均淤积厚度分别为0.59m、0.51m,就泥沙的落淤环境与促淤效果而言,不留缺口的方案1略优于预留1km缺口的方案2。建议围涂开发先期启动促淤工程建设,以改变围涂水域的泥沙淤积环境,加快围涂区淤涨。

英文摘要：

Implementation of a silting-promotion plan in advance is important to reclamation project.Such plan could improve environmental conditions and promote sediment deposition in the reclamation region,saving backfill work and project investment.To predict sediment transport,this paper develops a multifactor mathematical model containing a wave module,current module,sediment transport module and bedform topography-change module,and takes into account all the radiate force,shear force,sediment transport capability of waves and the breaking effect.This model was applied to the second phase of Wenzhou shoal reclamation for a silting-promotion plan by comparing two alternatives,plan I with a dam breach and plan II without the breach.The results are as follow.1） With a silting-promotion plan the second-phase project causes a change only in the flux discharge and flux rate near the north and south river mouths,with little effect on the other regions nearby.2） A decrease of flow velocity everywhere in the silting-promotion zone favors sediment deposition.In terms of hydrodynamic conditions for sediment transport and slit-promoting effect,plan I is a little better than plan II,and the predicted average deposition depths are 0.59m and 0.51m,respectively.