岸线地形变化对环渤海排污口临近海域水交换能力的影响

本文采用DHI MIKE3模型，基于渤海2004年和2014年的岸线地形数据，搭建了新旧岸线地形条件下渤海三维水动力模型，并在此基础上耦合拉格朗日粒子追踪模块，对环渤海主要排污口的粒子影响距离进行研究，来表征岸线地形变化对排污口附近海域的水交换能力的影响。模拟结果表明:环渤海排污口水交换能力整体呈减弱趋势。辽东湾西北部和东北部湾顶、渤海湾西北部湾顶、莱州湾大部分区域减弱幅度较大；渤海湾南口和渤海海峡附近水交换能力明显增强；位于岸线变化程度较小海域的排污口水交换能力变化不大。造成排污口附近水交换能力变化的主要原因包括岸线地形变化引起的余流方向、大小的变化和构筑物附近小环流的产生。

Impact of coastline and topography changes on water exchange of the adjacent seas of the drain outlets into the Bohai Sea

The hydrodynamic models was established based on DHI MIKE3, coupled with Particle Tracking module to study the influence distances of the particles released at drain outlets and analyze the impact imposed on the water exchange of the adjacent seas of the drain outlets into the Bohai Sea by coastline and topography changes from 2004 to 2014.The numerical simulation results indicated that water exchange becomes weaker on the whole.The distance is significantly decreased in the northeast and northwest of Liaodong bay, northwest of Bohai bay and most area of Laizhou bay.Water exchange significantly enhanced in south Bohai bay mouth and Bohai strait, the variation is small where the change of coastline and topography is small.The changes of coastline and topography would influence water exchange because they influence the value and direction of residual current and produce new circulations near these areas.