自然资源学报 ›› 2015, Vol. 30 ›› Issue (3): 513-522.doi: 10.11849/zrzyxb.2015.03.014

• 资源研究方法 • 上一篇    下一篇

海面动力学粗糙度参数化方案对近海风资源评估结果的影响

周荣卫, 何晓凤   

  1. 中国气象局公共气象服务中心, 北京100081
  • 收稿日期:2014-05-08 修回日期:2014-09-24 发布日期:2015-03-23
  • 作者简介:周荣卫(1979-),男,江苏东台人,高级工程师,博士,主要从事风能资源数值模拟评估和预报.E-mail:zhourw@cma.gov.cn
  • 基金资助:
    国家自然科学基金资助项目(41305008, 91215302, 51278366).

Influence of Different Sea Surface Dynamical Roughness Parameterization Method on Wind Energy Resource Assessment in Offshore Area

ZHOU Rong-wei, HE Xiao-feng   

  1. CMA Public Meteorological Service Center, Beijing 100081, China
  • Received:2014-05-08 Revised:2014-09-24 Published:2015-03-23

摘要: 采用数值模拟手段可以获取风能资源开发利用高度处资源量的区域分布状况,海面的动力学特性对近海面风速的数值模拟结果影响较大,论文采用WRF模式来研究不同海面动力学粗糙度参数化方案对近海及沿海地区风能资源的数值模拟评估结果影响以及方案的适用性.采用不考虑粗糙度变化(P_0)、WRF模式中参数化公式系数为定值的方案(P_WRF)、Yelland和Taylor 的分风速对参数化系数进行取值的方案(P_YT)对杭州湾近海及沿海地区风场进行模拟研究.通过与观测资料的对比分析可以得出以下结论:通过参数化方法改变海面动力学粗糙度可以改进近海和沿海地区风速的模拟效果,且P_YT 方案的模拟效果要优于P_WRF方案;当观测点为海风时,考虑粗糙度变化方案的风速模拟结果改进更加明显;观测点风速低于约8 m/s 时,所有方案模拟结果的相对误差均随风速增加而降低,P_YT 方案的模拟误差最小,P_0 的误差最大;而当风速大于8 m/s 时,相对误差会随风速的增加而增加,P_YT方案模拟误差最大,P_0 方案误差最小.三种方案模拟风能资源差异主要体现在陆地沿海和近海区域,离海岸线较远的陆上地区模拟结果相差不大,在沿海和近海区域方案P_WRF平均风速模拟结果比方案P_YT的偏高约为0.5 m/s,平均风功率密度偏高约为50 W/m2.

Abstract: Regional distribution of wind energy resource at useful height was achieved by numerical simulation method. The results of wind speed simulation were influenced by dynamical characteristics of sea surface. WRF model was used to simulate in different sea surface dynamical roughness parameterization schemes to disclose the influence of different scheme on wind energy resource assessment in offshore and coastal area and evaluate the applicability of each scheme. Three schemes were used to simulate the wind field with WRF model in Hangzhou Bay: constant value of 0.0001 (P_0), scheme of WRF model with constant coefficient in parameterization formula (P_WRF), and scheme of Yelland and Taylor using different coefficients for different wind speeds (P_YT). The following conclusions were drawn by comparison between the simulation results and the observation data: 1) the simulation results of P_WRF and P_YT schemes were better than that of scheme P_0, and the result of P_YT scheme was more in agreement with the observation data than that of P_WRF scheme. 2) During the sea wind, the improvement was more obvious in P_YT scheme. 3) When the observational wind speed was less than 8 m/s, the relative errors of simulated wind speed in three schemes all decreased with the increase of wind speed, and the result of P_YT scheme was the best, and that of P_0 scheme was the worst. While the relative errors of all three schemes increased with the increase of wind speed when the wind speed was greater than 8 m/s, and the relative error of P_YT scheme was the greatest, while that of constant value was the least. 4) The difference between three schemes was obvious in coastal and offshore area, while in the area where was far from the coastline, the difference was less. In coastal and offshore area, the average wind speed was overestimated with about 0.5 m/s by P_WRF scheme than by P_YT scheme, while the average wind power density was overestimated with about 50 W/m2.

中图分类号: 

  • P425