基于拉格朗日粒子追踪的渤海冬季与夏季环流及影响因素  

Study of Bohai Sea circulation and its influencing factors during winter and summer based on Lagrangian particle tracing method

作　　者：王金华[1] 沈永明[1] 石峰[1] 陈晓亮[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验,辽宁大连116023

出　　处：《水利学报》2011年第5期544-553,共10页Journal of Hydraulic Engineering

基　　金：国家自然科学基金重点项目(50839001);国家自然科学基金项目(50979036)

摘　　要：基于三维非结构有限体积海洋模式(FVCOM)对渤海环流进行了数值模拟研究。数值模拟中采用三角形网格,以更好地拟合渤海复杂的岸线边界。潮位、潮流、温盐模拟结果验证良好。通过对粒子的拉格朗日追踪研究了渤海冬季与夏季环流及潮、风、海气热交换和入海径流对渤海环流的影响。研究表明:粒子输移存在明显的三维结构;与渤海中部及海峡附近相比,3个湾内水体输送均较小、表底层相差不大;渤海夏季环流强度较冬季强;由风引起的水体输送对渤海环流影响较大;温盐环流对水体输送的影响主要在夏季,在冬季,影响可以忽略;河流只对河口附近环流结构有影响;夏季,与热盐、风相比潮流对水体输送贡献较小;在研究渤海的拉格朗日余流时,只考虑单分潮的作用将不能反映渤海的实际环流情况。Numerical study of the Bohai Sea circulation was carried out based on three-dimensional primitive equation ocean model.The model was easy to fit the irregular coastal boundary of the Bohai Sea with the unstructured triangular grid.The simulated tides,tidal current and thermohaline field were well verified by observation data.The circulation of Bohai Sea during winter and summer and their relations between tides,wind,river discharge as well as the heat flux were studied by means of Lagrangian trajectory.It shows that the transport of particles behaved 3D structure in the Bohai Sea.Compared with central Bohai Sea and Bohai strait,transportation in three bays and the differences between surface and bottom layer were small.Circulation in summer was stronger than that in winter.Wind played an important role in circulation,and the thermohaline circulation was important during summer;however it was negligible during winter.River runoff only affects the area around river mouth.Compared with wind and thermohaline effect,the contribution of tides was small during summer.

关 键 词：渤海 LAGRANGIAN 非结构网格 有限体积法 三维水动力模型 

分 类 号：TV139.2[水利工程—水力学及河流动力学]