https://scholars.lib.ntu.edu.tw/handle/123456789/161972
Title: | 衛星遙測與空間統計應用於水庫優養評估之研究 | Authors: | 鄭克聲 | Issue Date: | 2002 | Publisher: | 臺北市:國立臺灣大學水工試驗所 | Abstract: | 傳統上水庫或封閉水體之營養狀態(trophic states)是利用現地水質採樣之分析結果而判定。然而僅依靠有限之採樣點之分析結果未必能代表廣大水域水體之營養狀況。本研究利用衛星遙測之多光譜影像,評估水庫水體之整體與地區性營養狀況。研究 結果顯示Landsat 衛星之第二與第四波段光譜灰階與沙奇盤深度、總磷與葉綠素濃度等水質參數具有良好之關係。研究中提 出一套修正型之營養狀況指標,以使該指標能正確反應地區性之水質參數特性,並建立適合德基水庫應用之營養狀況指標。 最後本研究利用隨機變域繁衍技術以推估整體水域平均與各段面營養狀況指標之機率分布,此機率分布可作為水庫水體營養狀況機率評估之依據。 Reservoir water quality is traditionally monitored and evaluated based on field data collected at limited locations. Whether the limited field data represent the overall trophic state of a vast water body is often disputed. In this study we utilize Landsat TM data to evaluate the overall trophic state of Te-Chi Reservoir in Central Taiwan. Three water quality parameters: concentrations of chlorophyll-a, total phosphorous measurement, and secchi disk depth, are found to have high correlations with transformed spectral features derived from bands 1, 2, 3 and 4 of TM data. Therefore, TM data are used to yield a trophic-state-index (TSI) map of the reservoir. We then apply the geostatistical simulation technique to generate a large number of TSI realizations. Using these realizations probability distribution of the overall reservoir trophic state can be estimated. TSI cutoff values of 60.6 and 73.5 are used to signify the reservoir trophic state of eutrophication and hypereutrophication. The reservoir trophic state is considered eutrophic or hypereutrophic if the probability that the overall TSI exceeds the cutoff value (60.6 or 73.5) is greater than 0.9. Based on this criterion, the trophic state of Te-Chi reservoir is found to be eutrophic, and occasionally hypereutrophic. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/9900 | Other Identifiers: | 902313B002329 | Rights: | 國立臺灣大學水工試驗所 |
Appears in Collections: | 生農、工學院附設水工試驗所 |
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902313B002329.pdf | 192.46 kB | Adobe PDF | View/Open |
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