一般情况下陆地水体上流场演变的模拟结果

A SIMULATION OF A FLOW OVER AN INLAND WATER BODY UNDER GENERAL SYNOPTIC SITUATIONS

本文用一个包含地面过程参数化和水温预报方案的非静力平衡中小尺度数值模式,研究一般天气条件下陆地水体上的风场特征。一般天气条件下,过水体气流流场,受水陆粗糙度差异的动力作用和水陆热力差异的局地风共同作用。水陆粗糙度的差异是稳定的,而水陆热力差异,则有明显的日周期变化和季节变化。本文对模拟出的结果进行初步分析,得出了陆地水体上流场的空间结构和变化特征。

A two-dimensional non-hydrostatic numerical model including the parameterization of land surface processes and the prediction schemes of surface temperature both on land and on water body is developed to predict the spatial structure and variation characteristics of a flow over an inland water body under general synoptic situations. Both the dynamic effects of the difference of surface roughnesses and the thermal effects of difference of surface temperatures between land and water body result in the change of the flow over the inland water body. The difference of surface roughnesses between land and water body is fixed, but the difference of surface temperatures between land and water body has an obvious diural and seasonal variation. Thus the flow over inland also has an obvious diural and seasonal change. In this paper, we analyse the simulated flow over an inland water body, and the results show the spatial structure and variation charateristics of the flow over an inland water body under general synoptic situations.