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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。
Taking Qilihai Lagoon in Hebei Province as an example, a three-dimensional tidal current mathematical model for the Qilihai Lagoon and the Liaodong Bay on the outlying sea was established, and the tidal current data were used to verify the model. The results show that the model can simulate the flow field in Qilihai Lagoon and the Liaodong Bay offshore. In order to evaluate the water exchange capacity of the lagoon, conservative substances in dissolved state were selected as tracers to describe the time-dimensional characteristics of water exchange with the outside world by updating the time. The results show that in the absence of wind, the exchange capacity of water bodies at the end of the lagoon is poor and the water exchange time is more than 800 d. After considering the wind direction, the exchange time of water body is greatly shortened, and the effect of northeast wind is especially significant. The exchange time of water body is less than 300 d Conducive to the transport and diffusion of pollutants.