复杂地形区域风场物理过程参数化方案敏感性分析

Sensitivity analysis on physical process parameters of wind field within complicated terrain region

在地形比较复杂的山地地区,WRF中尺度气象模式对风电场风资源评估和预测的准确性受物理过程参数化方案选取的影响。研究边界层参数化选取了YSU、MYJ和ACM2方案;陆面过程参数化方案选取了Noah、RUC和Pleim-Xiu方案,对湖南省湘西自治州某风电场区域,采用1 km×1 km水平分辨率进行数值模拟研究,分析9种不同试验方案对模拟结果的影响,结合实测的数据对物理过程参数化方案进行敏感性分析。研究表明:对于区域的风速模拟计算,在测风年(2006年9月1日—2007年8月31日)春季的最优物理过程方案为YSU边界条件和RUC陆面过程;夏季的最优物理过程方案为YSU边界条件和RUC陆面过程;秋季的最优物理过程方案为MYJ边界条件和Pleim-Xiu陆面过程;冬季的最优物理过程方案为YSU边界条件和RUC陆面过程。研究成果为复杂地形区域风场的应用提供参考。

Within a mountainous region with complicated terrain, the accuracies of the evaluation and the prediction of wind re- sources in a wind farm made with WRF mesoscale meteorological mode are impacted by the selection of the paranleterization scheme of the physical process therein. The schemes of YSU, MYJ and ACM2 are selected for the study made on the boundary layer parameterization, while the schemes of Noah, RUC and Pleim-Xiu schemes are chosen for the land surface parameterization as well, and then a numerical simulation on a wind farm area in Xiangxi Autonomous Prefecture of Hunan Province is carried out herein with the horizontal resolution of 1 km×1 km; in which the impacts from 9 different test schemes on the simulation result are analyzed, meanwhile the sensitivity analysis is made for the parameterization scheme of the physical process in combination with the measured data. The study result shows that for the simulative calculation of the regional wind speed, the optimal physical process schemes of the spring are MYJ boundary condition and Ruc land surface process, the optimal physical process schemes of the summer are YUS boundary condition and Ruc land surface process, the optimal physical process schemes of the autumn are MYJ boundary condition and Ruc land surface process and the optimal physical process schemes of the winter are YUS boundary condition and Ruc land surface process respectively in the wind measured year from September 1,2006 to August 31,2007. The study result can provide a reference for the application of a wind farm within a complicated terrain region.