Assimilative Capacity Analysis and Total Maximum Daily Load Strategy for a Reservoir System

水庫系統之涵容能力分析及總量管制策略研究

張嘉玲(CHIA-LING CHANG) ； 陳怡安(YI-AN CHEN)

《台灣水利》 69卷2期 (2021/06) Pp. 8-15

https://doi.org/10.6937/TWC.202106/PP_69(2).0002

摘要

Environmental development can bring economic benefit yet impact the environment. Therefore, it is important to consider environmental assimilative capacity for maintaining a balance condition between environmental development and environmental protection. The study area herein is a famous sightseeing spot in Taiwan-the Sun Moon Lake Reservoir. The purpose of this study is to evaluate the assimilative capacity of the Sun Moon Lake Reservoir. Assimilative capacity analysis can be useful reference for implementing total maximum daily load (TMDL) strategies in reservoir management. This study evaluates the pollution sources including point source pollution and non-point source pollution, thus applies the Vollenweider model to analyze the relationship between pollution sources and reservoir water quality. The results indicate that the maximum allowable load of the total phosphorous (TP) entering the reservoir is about 6,600 kg/year under the A-class water quality standard, i.e. TP ＜ 0.020 mg/L, for the average condition of the reservoir water quality. However, due to the special activities around the reservoir, the water quality of the Sun Moon Lake Reservoir is usually negatively affected. This study suggests that the maximum allowable TP load should be limited in a more conservative manner.

關鍵字

Assimilative capacity ； Reservoir water quality ； Reservoir management

並列摘要

環境發展可能帶來經濟效益卻也可能衝擊環境，因此，為維持環境發展與環境保護之平衡，考量環境涵容能力是相當重要的。本研究區域為台灣著名觀光水庫日月潭，本研究目的在評估日月潭水庫之涵容能力，並以涵容能力分析結果作為水庫總量管制策略建立之重要參考資訊。本研究評估入庫污染源，包括點源污染及非點源污染，並應用Vollenweider模式分析污染源與水庫水質之關係。由本研究分析結果可知，在甲類水體水質標準下（TP＜0.020 mg/L），日月潭水庫每年最大容許入庫之總磷污染負荷總量約為6,600 kg；然而，由於日月潭水庫在特定觀光熱季之特殊活動，對水庫水質將有較大之負面衝擊，因此，本研究建議在可容許入庫總磷負荷量之規範上應採較為保守的方式訂定。

並列關鍵字

涵容能力 ； 水庫水質 ； 水庫管理