The corrected method of flux using Gyro at non-static platform

• Main Authors: Hsiang-Yun Hsieh, 謝祥雲
• Other Authors: Ben-Jei Tsuang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/88343605749240464704

碩士 === 國立中興大學 === 環境工程學系所 === 94 === There are lots of factors needed to be overcome when measuring “accurate” flux at sea, including wave stress reduced by sea-spray、flow distortion cause of the mobile vessel and other environmental contaminations. This study is trying to simulate mobile platform at sea which using Gyro that could measure angle vectors（pitch, roll, yaw）along three axis and setup two eddy covariance systems on soybean field of Wu-Feng Agricultural Research Institute, Taichung, Taiwan (24°01´ N ,120°41´ E).There are three different experimental designs to measure covariance flux of atmosphere（still vs 0 rom、still vs 5rpm and still vs 10 rpm；between 27 Dec. 2005 and 17 Jan. 2006, between 18 Jan. 2006 and 20 Jan 2006, between 20 Jan. 2006 and 24 Jan. 2006）and then use statistics methods of OLS, RMSE, MAE, STDEV to compare three different correction methods of two-axis rotation correction、three-axis rotation correction and sea correction method published by Edson（1998）.The results showing that the sea correction method is the most appropriate method, secondly is two-axis rotation correction. Although three-axis rotation correction is relatively unsatisfactory, it is still better than uncorrected data. Therefore, the raw data is needed to be corrected certainly.