景观型泻湖水体交换特性研究  

On the water-body renewal of a landscape lagoon

作　　者：陈媛媛[1,2] 高学平[1] 张晨[1] 张萌[2] 张扬[2] 俞云飞[2] 李云霞[2] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《安全与环境学报》2014年第1期153-156,共4页Journal of Safety and Environment

基　　金：国家自然科学基金项目(50909070);天津大学自主创新基金项目(2012XZ-075)

摘　　要：以河北省七里海泻湖为例,建立了七里海泻湖及外海辽东湾的三维潮流数学模型,利用潮汐的实测数据对该模型进行了验证。结果表明,该模型能较好地模拟七里海泻湖及外海辽东湾的流场。为评价该泻湖的水体交换能力,选用溶解态保守型物质作为示踪剂,以更新时间来描述水体与外界交换的时间维特征。结果表明,无风情况下,泻湖末端水体交换能力差,水体交换时间大于800 d;考虑风向因素后,水体交换时间大幅缩短,以东北风作用尤为显著,水体交换时间均小于300 d,最有利于污染物的输移扩散。In this study, we would like to take Qilihai lagoon （in Hebei Province） as a case to show the importance for keeping the quality of the water body by renewing the water in the lagoon. As we know, it is of great importance to study the dynamics of water renewal in an estuary, lagoon or reservoir so as to guarantee the regular trans- portation and transformation of nutrients and sediment in the water body. It is for this purpose that we have done a model simulation for the water renewal in such areas and compared the evaluation results with the tide-observation results, revealing that the model we have worked out should be qualified enough to simulate the hydrodynamic conditions in the lagoon. By using a passively dissolved and conser- vative agent as a tracer and taking the renewal time as the water re- newal timescale, we have described the water renewal characteristic features in the lagoon. And, then, we have investigated two series of simulations to reproduce the effect induced by the tide and the wind. As a result, we have found that in the first scenario, only the tide forces the basin, whereas in the second scenario, it was found that two kinds of typical winds, the southwest wind and the northeast wind, had been affecting the constant magnitude of 5 m/s prescribed together with the tide. Thus, the results of our observation indicate that the end areas in the reconstructed lagoon can be characterized by a low water renewal capacity on the condition that, if only the tide were to push the circulation, it would take more than 800 days for the water to accomplish its renewal. However, on the condition that the wind and the tide pushed the water circulation together, the water re- newal situation would be much better or ought to be enhanced remark- ably. In that case, with the help of the southwest wind, the water re- newal period would be no more than 400 days, while with the help of northeast wind, the water renewal period would be no more than 300 days. Thus, it can be concluded that the best wind direct

关 键 词：环境工程学 景观型泻湖 水体交换 更新时间 环境水动力模型 

分 类 号：X321[环境科学与工程—环境工程]