大连区域海陆风环流的数值模拟  

Numerical simulation of sea-land breeze circulation in Dalian,Liaoning province

作　　者：汪鹏[1] 穆海林[1] 梁二芳[1] 宁亚东[1] 宋永臣[1] 

机构地区：[1]大连理工大学海洋能源利用与节能教育部重点实验室,辽宁大连116023

出　　处：《气象与环境学报》2009年第2期16-22,共7页Journal of Meteorology and Environment

基　　金：国家自然科学基金"基于未确知信息的能源环境模型研究(No.70873013)"资助

摘　　要：基于海陆风环流的形成机制,在研究分析海陆风环流形成的物理模型基础上,建立了海陆风环流的数学模型。以大连地区海陆风环流为计算实例,模拟了海陆风形成的压力场、速度场、温度场和湍流动能场的日变化及太阳辐射日变化过程中地面能量变化及导致的湍流动能变化,预测出海陆风环流的水平湍流扩散系数和动量、温度和湍流动能的垂直湍流扩散系数,为求解海陆风中的污染物扩散浓度以进行环境污染损失评价提供参考。应用此模型,对大连地区的海陆风环流进行了数值模拟,定性与定量地给出了海陆风场中的速度、压力、温度及湍流动能分布情况和主要参数值。结果表明:海陆风环流的大气压力场局地日变化较小,温度场变化较明显。在中午前后,动量、温度和湍流动能的垂直扩散系数达到了最大值。模拟结果与其他文献模拟结果的对比表明,本文建立的模型模拟与实验结果相符,但预测精度仍需要进一步检验。Based on the mechanism of sea-land breeze circulation and its formation of physical model, the numerical simulation model was established. According to the above-mentioned, the diurnal variations of atmospheric press field, velocity field, temperature field and turbulent kinetic energy field were simulated. The daily variations of solar radiation and ground energy as well as turbulent kinetic energy were described. The horizontal turbulent diffusion coefficient of sea-land breeze and the vertical turbulent diffusion coefficient of momentum, temperature and turbulent kinetic energy were simulated, which can provide the reference for solving the pollutant diffusion concentration of sea-land breeze in order to estimate the loss of environmental pollution. Sea-land breeze circulation in Dalian was simulated by this method,and the distributions of velocity, press, temperature and turbulent kinetic energy and other related parameters were analyzed quantitatively and qualitatively. The results indicate that the local diurnal variation of atmospheric press field of sea-land breeze circulation is small, while the variation of temperature field is evident. The maximum values of vertical turbulent diffusion coefficient of momentum, temperature and turbulent kinetic energy appear at noon. Compared with the simulation results from the literatures, the resuits from this model accord with the results from the experiments. However, the prediction accuracy should be further tested.

关 键 词：海陆风环流 湍流动能 扩散系数 空气污染损失 大连海域 

分 类 号：P435.1[天文地球—大气科学及气象学]