大气与环境光学学报, 2009, 4 (6): 406, 网络出版: 2010-05-26
风廓线雷达的谱宽分析及湍流耗散率的
Research on Doppler Radar Spectral Width and Variability of Turbulent Dissipation Rate
摘要
湍流动能耗散率(简称湍流耗散率)是表征湍流强弱的重要参数。利用风廓线雷达的谱宽估算湍流耗散率是研究湍流强度的一 种新方法。分析了airdar16000风廓线雷达的回波功率谱谱宽的影响因素,提取出湍流贡献的谱宽加宽,并由此计算湍流耗 散率。得出结论:湍流谱宽值在0.5 m[EQUATION]s[EQUATION]以内;在风廓线雷达的波束中,倾斜波束的谱宽值比垂直波束的谱宽值更可靠;利用 倾斜波束提取的谱宽计算得到的湍流耗散率的量级在10[EQUATION]m[EQUATION]s[EQUATION]到10[EQUATION]m[EQUATION]s[EQUATION]之间;湍流 耗散率的大小随着高度的增加而减小。结果同理论符合,证明该方法可行。
Abstract
Turbulent kinetic energy dissipation rate (turbulent dissipation rate) is an important parameter of the turbulence. There is a new measurement on the turbulence, which estimats the turbulent dissipation rate using the spectral width of wind profiler. Based on studying the influencing factor on the spectral width of echo signal of airdar16000 wind profiler radar, and extracting the spectral width contributing by turbulence, the turbulent dissipation rate can be estimated. Results show that the value of spectral width from turbulence is below 0.5 m[EQUATION]s[EQUATION], and the oblique beams are more reliable than the vertical beam, and the turbulent dissipation rate distributes between 10[EQUATION]m[EQUATION]s[EQUATION] and 10[EQUATION]m[EQUATION]s[EQUATION]. It decreases with the increase of the height. The result accords with the theory, so it is feasible to estimate the dissipation rate from wind profiler radar.
张彩云, 董德保, 翁宁泉. 风廓线雷达的谱宽分析及湍流耗散率的[J]. 大气与环境光学学报, 2009, 4(6): 406. ZHANG Cai-yun, DONG De-bao, WENG Ning-quan. Research on Doppler Radar Spectral Width and Variability of Turbulent Dissipation Rate[J]. Journal of Atmospheric and Environmental Optics, 2009, 4(6): 406.