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頁籤選單縮合
題名 | On the Correlation Scales of Currents along the Transect from Keelung to Dongyin=基隆至東引沿線海流相關尺度之研究 |
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作者姓名(中文) | 陳先文; | 書刊名 | 警學叢刊 |
卷期 | 30:5=129 2000.03[民89.03] |
頁次 | 頁201-213 |
分類號 | 351.96 |
關鍵詞 | 相關函數; 相關尺度; 共變矩陣; 變異數; Correlation function; Correlation scale; Covariance matrix; Variance; |
語文 | 英文(English) |
中文摘要 | 本研究係運用1998年9月19至20日沿基隆至東引海域所測量之SB-ADCP資料推算海流的相關性與相關尺度。背景流場係以一次線性迴歸方程式趨近實測值求得,擾動流場之空間相關函數則由流場之共變矩陣除以其變異數所得,同時以3公里為一平均格點求得各格點之相關函數。相關尺度之定義為空間相關函數曲線之第一個跨零交點(zero-crossing),由資料分析得知,此海域流速之東西方向相關尺度為15.5公里,南北方向的尺度為15公里,顯示了該區域之海流具有各向等性(isotropic)之趨勢。 |
英文摘要 | Correlation scales of currents along two transects from Keelung to Dongyin were assessed using the SB-ADCP date collected during the period from September 19 to 20 of 1998. The background current field was estimated by a linear least square fit to the observed current field. Spatial correlation function was derived from the covariance matrix normalized by the variance. We also performed a bin-average procedure with a bin size of 3 km to suppress high-frequency noise. The correlation scale was defined as the first zero-crossing of the correlation function with spatial lag. From our analysis, the correlation scale of the east-west component of currents in this region is approximately 15.5km and the north-south component is 15 km, which implied that the slow field tends to be isotropic during the time of survey. |
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