以光達進行自然風場風速剖面遙測之初探

Application of Lidar on the Field Measurement of Atmospheric Boundary Layer

「建築物耐風設計規範及解 」中，對於設計風 有重要影響的 且具有本土特性的是設計風速及風場特性。風場特性則包括 同地況的風速分佈以及紊 特性。由於缺乏實測資 ，我國規範的風場特性是 考ASCE-7的相關規定所研訂。然而我國規範中的設計風速主要受到颱風的影響，與美國大 型氣候 盡相同，加以 國的都市鄉鎮建築形式存有相當差 ，直接採用美國的風場特性，未必能正確的反應本土的風場特性。建 相關的實場監測 據做為未 風 規範的修訂依據，實是當務之急。本研究的宗旨即在 同的標準地況條件下，進 自然風場之實場監測，逐步建 可以反應本土特色之風速剖面以及紊 模式等相關 值。本研究引進可攜式之都卜 光波 達監測系統，簡稱光達（Lidar, Light Detection And Ranging measurement system）進 風速剖面之遙測。經與定點裝置之超音波風速計比對證實光達可以有效 測平均風速與風向。本研究並在 同地況中進 初步之自然風場風速剖面遙測。

Design wind speed and characteristics of the nature wind are two localized wind load factors in building wind code: 'Specifications for Building Wind Resistant Design'. Due to lack of local field data, the parameters related to characteristics of the nature wind are transplanted from the ASCE-7. Typhoon is the primary factor of design wind speed in Taiwan, which is different from the continental America. Furthermore, Taiwan is a mountainous island with complex terrain. The topographic features of the so called 'large city', 'suburban' and 'country side' in Taiwan are quite different from the continental nation such as the Unite States. Therefore, the terrain category for the wind field of these two different countries may not be the same. Therefore, this research project introduced the state of art telemetric measurement, Lidar (Light detection and ranging measurement system), for the in-situ measurement of the atmospheric boundary layers. This paper describes the capacity and data processing scheme for the new instrument and the validation procedure of the Lidar measurements. Two sets of atmospheric boundary layer measurement data acquired by Lidar are also presented in this paper.