Laorensha reclamation plan is located in the shallow water and tidal waterway in Qinzhou bay,and it has a significant influence on current and sediment.With physical model of flow and sediment,whole tidal current and current change of reclamation plan was simulated and carried on the comparative analysis, and sediment deposition was simulated in the waterway.Test results show that tidal current has a very big change between channel and waterway and tidal prism will also decrease, although the reclamation plan is along the current.The siltation thickness is up to 0.19 m/a in these waterways.Southern coast shape should be optimized to reduce the change of convergence in reclamation scheme,but reclamation plan should be made as careful as possible.%钦州湾老人沙规划围海方案处于口门涨落潮通道的浅滩上,围垦会对钦州湾海域水动力和泥沙环境产生影响.借助于潮流泥沙物理模型试验,模拟整个钦州湾海域潮流情况,对规划方案流态、潮流场变化、港池航道泥沙淤积进行了模型试验研究.模型试验研究表明,在钦州湾涨、落潮通道浅滩处口门围海,虽然利用地形地貌顺水流布置,仍会造成通道内水流重新分配及湾内纳潮量减少,规划方案对钦州湾纳潮量影响均减小4%左右,港池航道平均回淤强度在0.19 m/a内.虽然优化围垦方案南端岸线形状可减少分汇流影响,但在钦州湾口门围垦还应慎重.
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