應用SUSTAIN模式模擬非點源污染削減能力-以鳶山堰集水區為例

SUSTAIN Model-based Simulation of NPS Pollution Reduction Capability – A Case Study of Yuanshanyan Watershed

施明言(Ming-Yang Sheng)

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(2013年)

https://doi.org/10.6841/NTUT.2013.00236

摘要

位於桃園縣的鳶山堰供應北桃園地區與新北市部分地區民生飲用水，其河系與供應桃園地區的石門水庫同屬淡水河系大漢溪支流，位於石門水庫下游約19公里，人為開發的情況下造成鳶山堰水質惡化，使得取水口水質達成率近十年來低於50%，為改善其水質，本研究利用LID決策支援系統(SUSTAIN)，模擬在集水區中施作LID設施對非點源污染的削減效益。
使用LID決策支援系統(SUSTAIN)前，內部使用之水文水質參數藉由決定係數R2、模式有效性係數NSE及平均誤差百分比MAPE判定指標皆符合接受值，讓模擬成果更具可靠性；利用SUSTAIN模式模擬LID設施施作於研究區域，並選用點、線、面三種不同類型之LID設施作為模式模擬使用，模擬結果指出，點型設施植生滯留槽效果最佳，可削減的非點源污染負荷量總磷7%、總氮11%、懸浮固體8%及生化需氧量17%；本研究利用SI值判別SUSTAIN模式中使用之LID設施參數敏感度，計算結果指出LID設施內部土壤滲透率參數為影響非點源污染削減效益之主要參數。

關鍵字

非點源污染 ； LID ； SUSTAIN

並列摘要

Yuanshanyan is located in Taoyuan County and supplies drinking water for the livelihood of residents in Northern Taoyuan and part of New Taipei City. Like Shimen Reservoir that supplies water for Taoyuan, the river system of Yuanshanyan is part of Tahan River, a tributary in the system of Tamsui River. Situated at a distance of about 19 km from the downstream of Shimen Reservoir, Yuanshanyan Watershed includes the renowned tourist destination, Daxi Old Street, and three urban planning areas, where human activity causes water quality in the watershed to deteriorate, resulting in water quality compliance at intake (DO, BOD, SS, and NH3-N) that has remained below 50% for nearly a decade. For the purpose of improving water quality in the watershed, sources of pollution were divided into point and nonpoint sources of pollution. The former could be controlled through sewage systems while the latter was an occurrence associated with rains. Therefore, this study simulated how the implementation of LID facilities could improve the water quality in the watershed using the LID decision support system, SUSTAIN.
Prior to the use of the LID decision support system, SUSTAIN, the hydrological and water quality parameters for internal use were determined to be in compliance with acceptable values using coefficient of determination R2, Nash-Sutcliffe model efficiency coefficient (NSE), and mean average percentage error (MAPE) to increase the reliability of simulated results. The implementation of LID facilities in the researched area was simulated using the SUSTAIN model. Three different types, i.e. point, line and plane, of LID facilities were chosen for the model-based simulation. Simulation results show that the bioretention cell in the point type facility is most effective and can reduce the total P, total N, SS and BOD in NPS pollution by 7%, 11%, 8% and 17%. Research results not only quantify the effectiveness of water quality improvement by LID, but also provide an assessment tool for decision-makers in watershed management. This study further determined parameter sensitivity of the LID facilities in the SUSTAIN model using the sensitivity index (SI). Calculation results reveal that soil permeability inside the LID facilities is the main parameter that affects the efficacy of NPS pollution reduction.

並列關鍵字

Nonpoint Source Pollution(NPS) ； LID ； SUSTAIN

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