广西科学2018，Vol.25Issue(1)：43-50,8.DOI:10.13656/j.cnki.gxkx.20180208.003
钦州湾蓄泥坑泥沙扩散数值模拟
Numerical Modeling of Sediment Diffusion from a Mud-storage Pit in Qinzhou Bay
摘要
Abstract
[Objective]In recent years,while the rapid exploitation of Qinzhou Bay has led to the development of marine economic,it has also caused some pressure on the marine environment around it.Therefore,it is necessary to try to find out a construction method that has the least impact on the surrounding environment caused by the sediment diffusion from Qinzhou Bay marine engineering.[Methods]The ECOMSED model was utilized to simulate the hydrodynamic changes and the sediment diffusion caused by the excavation of mud-storage pit in Qinzhou Sandun working area,and the effect of different enclosure tests on the reduction of sediment diffusion area was tested by sensitivityexperiments.[Results]It was found that the tidal current in Qinzhou bay was basically reversing current,and the ebb current was larger than the flood current.Most of the current direction was northward and southward in the mid-time of flood tide and ebb tide,respectively,with a maximum speed of 1.85 m/s and 2.34 m/s,respectively.The northern part of the mud-storage pit was basically a southwest current,the east was basically a south current,the south and the west were a southeast current.No matter the surface layer or the bottom layer,the currents to the northeast of the pit experienced the most significant changes before and after the project,with the velocity deviation of about 10％ and the average deviation of the surface layer and the bottom layer being 5.05° and 4.55°,respectively.The suspended solid envelope with a concentration of 10 mg/L in the non-enclosure sediment diffusion experiment had a large impact range,which could affect the reserved area and the shipping lane.In the enclosure experiment,the sediment diffusion areas in the east and west gap were basically the same as that of the non-enclosure test.However,the area of sediment diffusion in the south and north gap decreased significantly.[Conclusion]Therefore,the affection of sediment diffusion on the marine environment will be sharply reduced when the construction method uses a three-sided enclosure with only the gap in the north.关键词
钦州湾/蓄泥坑/ECOMSED/悬浮泥沙/潮流Key words
Qinzhou Bay/mud-storage pit/ECOMSED/suspended solid/tidal current分类
交通工程引用本文复制引用
吴桂丹,高劲松,朱冬琳..钦州湾蓄泥坑泥沙扩散数值模拟[J].广西科学,2018,25(1):43-50,8.基金项目
国家自然科学基金项目(41406044,41566001),广西科技攻关项目(桂科攻1598016-8),广西自然科学基金项目(2015GXNSFCA139023)和广西科学院基本科研业务费项目(2017YJJ23005)资助. （41406044,41566001）
