spot卫星系列影像监测石门水库水质优养化之应用 - 中兴大学土木 .doc

SPOT衛星系列影像監測石門水庫水質優養化之應用 Application of the SPOT Satellite Series Image to Monitoring the Eutrophic Status of Shihman_Reservoir 楊明德 劉益誠 黃凱翔 Ming-Der Yang Yi-Cheng Liu Kai-Siang Huang 摘要 水庫由於營養鹽，2006年5月至2007年3月間利用11張多時期SPOT衛星影像資料34筆總磷、35筆透明度、以及35筆葉綠素之現地採樣資料建立光譜與水質參數之回歸模式。藉由回歸模式可將衛星影像上之光譜資訊，轉換成對應之水質參數，並利用Carlson及OECD優養化指標判釋R2分別為0.74、0.80、以及0.83。以本研究成果為基礎，未來將試著利用時間序列方法，進行水庫水質優養化預測。 關鍵詞：石門水庫、優養化、遙測 ABSTRACT The Eutrophic Status of a reservoir results from the plankton reproduction due to an increase of the nutrition in the reservoir. Total phosphorous, Secchi depth, chl-a are the three typical parameters of affecting the eutrophic status. In situ investigation is the traditional approach for acquiring the low data of the three parameters, whereas it is time-consuming and inefficient. Moreover, an analyzed result of the low data usually can not be used to well assess the water quality of the whole reservoir. Currently, the satellite remote sensing technology instead of in situ investigation has been widely applied to environmental monitoring, so the satellite remote sensing technology is also adopted in this paper. The Shihman Reservoir, which is the largest reservoir in northern Taiwan, is selected to be the study site of this research. The experimental materials in this paper include 11 frames of SPOT series satellite images and the several low data of the three parameters investigated in situ from May 2006 to March 2007 in order to build the regression equations of the spectrums of satellite imagery vs. the parameters. The experimental result reveals that the correlation coefficients (R2) of total phosphorous, Secchi depth, chl-a are 0.74, 0.80, 0.83, respectively. Keyword: Shihman_Reservoir、Eutrophic Status、Remote Sensing 前言 過去幾年來水庫集水區過度開發，造成水庫水質優養化現象，而造成飲用水質降低。過去監測優養化方法採用現地人工採樣，此方法較耗時且需耗費較多的人力成本，現今則利用衛星遙測技術，其具有大範圍地表光譜資訊收集，轉換成特定的水質參數，可迅速、大範圍、準確的獲知水庫整體之水質監測。遙測技術應用於湖泊、水庫之水質監測，雷祖強(1999)以德基水庫為示範區域陳莉等人(2002)以永和山水庫為研究區域水質優養化Carlson優養化程度指標判釋Lillesand et a