摘要
在已建立的一种三维非静力细网格Ｅ－ε湍能闭合的动力学框架基础上，作了一些改进的技术处理和试验，包括：（１）利用ＧＩＳ提供的地形资料，较精确地计算太阳辐射，进而诊断地面温度；（２）引进位势流概念，处理稳定层结条件下初始内插风场的风向变化；（３）引入动力学调整项Ｇ（αｏｂｓ－α）。在此基础上，就地理信息系统（ＧＩＳ）提供的一个 ６０ｋｍ×４８ｋｍ区域作了边界层结构和湍流特征的数值模拟试验，并与实测作了比较，讨论了精细ＰＢＬ模式的模拟效果，结果表明，新建的ＰＢＬ模式能较好地模拟表征出复杂下垫面地域的陡峭地形和不规则海岸线对局地风场和湍流场的动力和热力学作用。
Based on a 3-dimensional fine-mesh non-hydrostatic and energy closure (E- scheme, the present study makes some modification and numerical tests, as follows: (1) making use of the terrain data from GIS (geography information system), the distribution of solar radiation is calculated more precisely, so that the surface temperature is diagnosed more exactly. (2) potential flow concept is introduced to the interpolation of l/r2 scheme, for consideration of wind deflection under the stable stratification condition. (3) A dynamical adjustment term, G(αobs-α), is applied. Numerical tests are made for the Hong Kong area (60km×48km) and PBL simulation are obtained with the data provided by GIS. It is shown that the improved PBL model can simulate more reasonably the effect of the abrupt terrain and irregular coasts. effects on local wind fields and turbulence field over complex terrain. It is also shown that the results obtained from this model better agree with observations.
出处
《热带气象学报》
CSCD
北大核心
2000年第2期186-192,共7页
Journal of Tropical Meteorology
基金
国家重点基础研究项目!G1999043400
中科院大气所LAPC"九五"项目!KZ952-51-405
关键词
E-ε湍流闭合
复杂地形
PBL数值模拟
大气扩散
nonhydrostatic model
energy closure (E- scheme
complex terrain
PBL numerical simulation
