风资源评估中粗糙度长度计算方法的讨论.pdfVIP

风资源评估中粗糙度长度计算方法的讨论 1 王丙兰 宋丽莉 柳艳香 中国气象局公共气象服务中心 北京 100081 摘要：地面粗糙度是风速等于零的某一几何高度，是风能评估的重要因素。地面粗糙度不能通过观 测直接得到，通常要通过其他资料来估算。粗糙长度的计算方法是大气边界层和风资源评估中值得 探讨的问题。对于均匀下垫面，粗糙度长度的确定较为容易，但是对于复杂的下垫面，情况有所不 同。实际估算粗糙度长度时，如何能确定所选数据是否能代表这个范围？本文利用全国400 个风能 观测塔2 年来的实测数据，从中选取可以代表各类典型垫面并且观测数据较完整处于各种下垫面的 的6 个塔的完整一年梯度风观测数据，用风廓线法来计算粗糙度长度，并引入“ 印痕” 的概念，对于 粗糙度长度的代表范围进行了讨论，估算了不同下垫面的粗糙度长度初步探讨了粗糙长度与平均风 速的关系。 关键词：粗糙度长度 印痕 Discuss of Calculation Method of Roughness Length in wind Energy Resources Assessment ABSTRACT 1 1 Wang Binglan Song Lili Liu Yanxiang Public meteorological service Center of CMA Abstract: The roughness length, as an important factor in wind energy resources assessment, is the height where wind speed is zero. As is known to all, the roughness length can’t be obtained directly, and is usually calculated used observed data. Therefore, the calculation methods have become a complex question worth researching. For homogeneous underlying surface, it is easy to determine. When it comes to inhomogeneous underlying surface, it will be in a different situation. How to evaluate the representative range of the roughness length? The paper used data selected several underlying surfaces from 400 observation towers in China, including mountain land, grass land, sea coast, and so on. The roughness lengths were calculated by profile method, and footprint was also used to estimate the representative range of the roughness length. The relationship between roughness lengths and wind speed was also discussed. 1 作者简介：王丙兰，女，博士，主要从事风资源和风工程研究。Email:wangbl0116@163.com 1 引言 地面粗糙度是风速等于零的某一几何高度，是风工程中的一个重要参数。地面粗糙度不能通过