翡翠水庫卡爾森指數變異性之研究

Study on the Variability of Carlson Trophic State Index in Feitsui Reservoir

盧素玲(Su-Lin Lu)

指導教授 ： 林鎮洋

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00263

摘要

翡翠水庫集水區為大臺北地區重要供水來源，故其水質優劣攸關大臺北地區自來水用水之潔淨與安全。為保障水庫水質安全，管理單位已於集水區內實施多項污染削減措施，包括規劃保護帶等。本研究探討既有最佳管理措施(BMPs)與保護帶實施後對水庫優養化評估指標卡爾森指數(CTSI)之影響，並分析其變異性。以過去的水質監測資料為基礎，進一步對總磷、透明度及葉綠素等數據分析，得到卡爾森指數的變化及造成其變異之因素。過去相關研究僅探討保護區對總磷削減的影響，本研究透過總磷、透明度及葉綠素的迴歸關係，來探討保護帶設置後的改善效果。研究結果顯示：造成卡爾森指數變異之主要因素為總磷，且因夏季多雨易造成水庫上游非點源污染沖刷而影響水庫水質，故卡爾森指數較高。

關鍵字

翡翠水庫 ； 優養化評估 ； 卡爾森指數 ； 最佳管理措施

並列摘要

The Feitsui Reservoir watershed is one of the most important sources of domestic water of the Taipei metropolis and its immediate vicinity. Thus, the quality of the water is critical for the safety of its users. To secure water quality, the Reservoir Administration Office has been conducting pollution reduction measures over the watershed, including planning of a protection belt within the watershed. This study is to investigate the effects of the Carlson trophic state index (CTSI) after the establishment of Best Management Practices (BMPs) and protection belts on water quality of the Feitsui Reservoir, as well as the analyses of the variability of the CTSI. Using past observation data, this study uses the data of total phosphorus, transparency, and chlorophyll to further investigate any changes of the CTSI and the factors that caused it. Previous studies only focused on the effects made by protection belts and the reduction of total phosphorus. This investigation analyses the regression relationship between total phosphorus, transparency, and chlorophyll, to discuss the improvements caused after the establishment of the protection belt. Our result shows that major factor causing the variability of the CTSI is total phosphorus, and during the raining season in the summer. Upstream erosion and non-point source pollution can affect the water quality of the reservoir, resulting a higher Carlson index.

並列關鍵字

Feitsui Reservoir ； Eutrophication Assessment ； Carlson Trophic State Index ； Best Management Practices

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