龙口湾人工岛群分阶段建设对水沙环境影响的数值研究

发布时间：2018-05-03 08:00

本文选题：龙口湾 + 数值模拟　；参考：《大连理工大学》2016年硕士论文

【摘要】：建设大型人工岛(群)是开发利用海洋空间资源、拓展我国滨海城市发展空间的重要方式,而不合理的工程建设规划将会导致自然岸线破坏,海洋环境恶化等问题,因此研究对海洋动力条件和地形地貌的影响较小的大型离岸人工岛(群)合理的分阶段建设方案具有重要的实践指导意义。本文以目前山东半岛龙口湾正在兴建的由龙口人工岛群和招远人工岛群组成的我国最大离岸人工岛群为研究对象,利用MKE21软件建立龙口湾人工岛群附近海域潮流泥沙数学模型和水体交换数学模型。在模型经过实测资料验证的基础上,模拟分析了只建成龙口人工岛群工况对潮流场和泥沙冲淤变化的影响,龙口人工岛群建成后、招远人工岛群的4种分期建设工况对潮流场和泥沙冲淤变化的影响,以及整体人工岛群水道内水体交换情况,并从海洋动力与水质交换角度比较分析了人工岛群分期建设的优化方案。结果表明：人工岛群分期建设中,先期建设的人工岛群会引起附近海域的海底地形和海洋动力环境条件发生较大的改变,因而后期人工岛群相隔一定时间建成后的附近海域地形冲淤演变不同于两部分人工岛群整体建设方案。在龙口部分人工岛群建成后、招远部分人工岛群分阶段建设过程中,综合考虑整体岛群水道内和临海外围海域的流场及泥沙冲淤变化情况,分期间隔较长的方案为优选方案。鉴于人工岛群整体建设与分期建设对周边海域水沙环境的影响不同,实际工程中可综合海洋动力条件和水质交换条件的改变情况科学制定分期建设方案,尽量减少对海洋环境的影响。
[Abstract]:The construction of large artificial islands (groups) is an important way to develop and utilize marine space resources and expand the development space of coastal cities in China. Unreasonable engineering construction planning will lead to the destruction of natural shoreline and the deterioration of marine environment, etc. Therefore, it is of great practical significance to study the reasonable phased construction of large offshore artificial islands (groups) with less influence on marine dynamic conditions and landforms. In this paper, the largest offshore artificial island group in China, composed of Longkou artificial island group and Zhaoyuan artificial island group, which is under construction in Longkou Bay, Shandong Peninsula, is taken as the research object. A mathematical model of tidal current and sediment and a mathematical model of water body exchange in the waters near the artificial islands in Longkou Bay were established by using MKE21 software. On the basis of the model verified by the measured data, the effect of the condition of only built Longkou artificial island group on the tidal current field and sediment scouring and silting change is simulated and analyzed. After the completion of the Longkou artificial island group, The effects of four stages of construction conditions of Zhaoyuan artificial island group on tidal current field and sediment scour and siltation, as well as the water exchange situation in the whole artificial island group waterway, From the point of view of ocean power and water quality exchange, the optimization scheme of artificial island group construction by stages is compared and analyzed. The results show that in the construction of artificial island group by stages, the pre-built artificial island group will cause great changes in the sea floor topography and marine dynamic environmental conditions in the nearby sea area. Therefore, the evolution of topography in the surrounding sea area after completion of artificial island group in the later stage is different from the whole construction plan of two parts of artificial island group. After the completion of some artificial islands in Longkou and Zhaoyuan artificial islands, the flow field and sediment scour and siltation in the waterway of the whole island group and the surrounding sea area of the whole island group are considered synthetically. The scheme with a long interval is the optimal selection scheme. In view of the different effects of the artificial island group construction and the phased construction on the surrounding sea water and sediment environment, it is possible to scientifically formulate the phased construction plan in practical engineering by synthesizing the changes of the marine dynamic conditions and the water quality exchange conditions. Minimize the impact on the marine environment.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P756.8;P731

【参考文献】