碩士 / 逢甲大學 / 水利工程與資源保育學系 / 101 / This study analyzed routine water quality monitoring data from Liyutan Reservoir. Data for the 19 years between 1994, the year the reservoir began operation, and 2012 were obtained from the Environmental Protection Administration, Executive Yuan, and analyzed on 18 dimensions, including the CTSI, clarity, chlorophyll-a, and phosphorous concentration. The residuals and ND values were calculated to determine the effects that hydrology and water diversions from Daan River have on water quality. Statistical testing was also performed to analyze the effect that cross-watershed diversion has on water quality. Factor analysis was conducted to identify the variation in water quality before and after water diversions, and to propose reasons for water diversions causing variations in reservoir water quality.
Principal component analysis was employed to select three or four factors with variances greater than 68% and Kaiser-Meyer-Olkin values higher than 0.5 for factor analysis. A comparison of rotations for handling residuals and ND values indicated that Promax rotation with factor loadings of 0.7 resulted in load factors with the highest eigenvalues. The factor analysis results showed that before cross-watershed diversion, phosphorus supply and algae factors were present (i.e., nutrient salts), and the reservoir contained non-point source pollution. After cross-watershed diversion, the greatest changes in reservoir water quality were observed for the reservoir capacity and algae factors. This suggests that cross-watershed diversion increased the storage capacity and discharge flow. The CTSI of reservoir water quality declines annually, which is the primary reason for the improving water quality of Liyutan Reservoir.
| Identifer | oai:union.ndltd.org:TW/101FCU05398015 |
| Date | January 2013 |
| Creators | 張筑程 |
| Contributors | 李漢鏗 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 109 |
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