2013-03-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/695204摘要：埤塘具有農業灌溉、防洪、水資源及水鳥棲息的多重功能。桃園埤塘平均水深介於1.1～2.5公尺間，其水深條件具有良好的水質處理潛力，且根據拉姆薩公約的定義，屬濕地生態系之一，其公埤、母埤、子埤的埤塘系統靠重力自然排水，是理想的生態工程典範，若能就水理流路及水生植物消長的綜合觀點進行埤塘設計，有機會大幅度改善埤塘的水質狀態，並進一步提升其生態及水資源價值。根據計畫主持人及相關研究團隊的研究發現，影響濕地水力效率的因子，包括入出口型式、阻擋結構物型式、濕地長寬比等，較佳的水力效率模型表現出蜿蜒的流路，乃因其停留時間較長，使水生植物有更多時間進行吸附及氧化作用之故。 本研究選擇兩處埤塘進行研究，分別為大溪傳貴池及龍潭吳家池，乃因其在設計之初即有蜿蜒流路的設計概念，吻合水力效率最佳化的原則，且加上有效搭配水生植物栽植及維護或能提供更佳的水質處理效果。本研究主要目的在利用數值模式，分析流場及水力效率以驗證該二場址之效率，並利用現場水質、水量、地形、水生植物的調查，找出一階衰減係數Kv值，並瞭解水生植物的消長對水質及水力效率的影響。希望研究成果在未來能逐步應用在埤塘活化上，強化埤塘在濕地生態保育上的角色及強度。<br> Abstract: Taoyuan farm ponds provide multiple functions, including agricultural irrigations, water-resource supplies, flood damage mitigation, etc. They also play a critical role for waterfowl habitat conservation, such as feeding, resting and breeding, and therefore are one of the most important wetland ecosystems. The water depth of the ponds lies on 1.1m to 2.5m which have been regarded to be reasonable for wastewater treatment. A well designation farm pond can be sustainable for not only human-beings’ activities but also for ecosystem conservation. Our previous study reveals that the obstruction of barriers can be utilized to establish a meandering flow path which offers a higher hydraulic retention time. This meandering flow path illustrates a “S” or “multi-S” shape with a relative trajectory matching curves of decontamination forces. We, thus, selected two farm ponds to examine the wastewater treatment efficiency and hydraulic efficiency, including the Changui Pond in Daci Township and Wuchia Pond in Luntong Township. Both of them were designed and constructed as S-shape flow paths with limited treatment spaces. The main purpose of this study is to develop an optimum regression model for enhancing the wastewater treatment capability of farm ponds with scientific rigor. The field survey of water quality, water quantity, and aquatic plants will be conducted every season. While the field survey of bathymetry will be observed one time per year for numerical model development. Moreover, the value of the 1st order volumetric removal rate constant, Kv, and the succession of aquatic plants will be discussed as well. The numerical models, such as RMA2 and RMA4 will be employed to simulate the flow condition and pollutant distribution of current situation and several scenarios. The outcomes of the numerical model simulation are used to calculate the effective volume, hydraulic efficiency, and hydraulic retention time subsequently.埤塘水生植物水利效率一階衰減係數farm pondaquatic planthydraulic efficiency1st order volumetric removal rate constant