請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41242
標題: | 模擬表面流人工溼地營養物質循環—系統動力模型建立與應用 Modeling nutrient cycles of surface water constructed wetlands—developments and applications of a system dynamic model |
作者: | Yung-Chieh Wang 王咏潔 |
指導教授: | 林裕彬 |
關鍵字: | 系統動力學,人工溼地,水質,營養物質循環,模擬模型, System dynamics,Constructed wetland,Water quality,Nutrient cycle,Simulation model, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 在集水區管理政策中,人工溼地常被應用於非點源汙染處理最佳管理方案之一。為增進溼地系統之設計與施行成效,利用電腦模擬,提供不同可行設計與管理策略之實施結果比較,以獲得使溼地系統達到其設計目標之最佳可行方案。本研究以系統動力學方法建構表面流人工溼地模擬模型,模擬溼地系統營養物質循環及水質淨化效能,並提供人工溼地操作管理重要參數之參考數值。參考前人研究,以系統動力學軟體STELLA完成表面流人工溼地系統模型建立,並將模型應用於實際案例,在台南成功大學人工溼地池與台北縣鹿角溪人工溼地模場進行參數校正與模型驗證;最後進行模型參數之敏感度分析,找出模擬結果主要影響因子。在南北兩個案例應用中,模型校正與驗證結果顯示:除少數影響參數如自營菌最大生長率、微生物(自營菌與異營菌)溶氧產率、20C°之脫硝速率常數等之外,許多參數校正值仍與文獻提供之參考數值相同;並且,溶氧(DO)、五日生物需氧量(BOD5)、總氮(TN)、總懸浮顆粒(TSS)與總磷(TP)等項目之出流濃度模擬值與實測值,經線性迴歸與皮爾森相關性等分析指出二者具有高度的統計相關性,顯示此模型可重現營養物質出流濃度之季節變化趨勢。敏感度分析結果顯示,微生物相關參數包括自營菌與異營菌最大生長速率和溶氧產率係數、異營菌總有機碳半飽和常數及產率係數、微生物氮含量比例、以及20C°之脫硝速率常數等對溶氧、五日生物需氧量與總氮濃度模擬結果有顯著影響;而顆粒之粒徑大小是影響總磷與總懸浮顆粒濃度之敏感參數。為提高模型精確度並擴大其適用範圍,後續研究將持續進行環境微生物與溼地植物相關調查,增加人工溼地模擬模型對現地生物與環境考量之完整性,以達到提供人工溼地操作管理與規劃設計參考之目標。 Constructed wetlands are applied as one of the best management practices to alleviate the impact of non-point source pollutions in watershed managing policies. To improve the design and implementation of wetlands, computer modeling provides an ability to make comparisons among alternative designs and managing strategies, thus allowing a wetland to be optimally utilized achieving its intended purpose. In this study, the approach of system dynamics is adopted to develop a simulation model for surface water constructed wetlands, and to provide appropriate values for the parameters of constructed wetland management. Following studies on wetland modeling, a dynamic model of surface water constructed wetlands was integrated by the system dynamic software STELLA, and then applied to two cases located in southern and northern Taiwan, respectively. As the model had been calibrated and validated using data from the tow study cases, sensitivity analysis was applied to find the major parameters that affected the simulation output. The results of calibration and validation indicate that many of the parameter values were the same as those reported in the literature with a few parameters calibrated deviating from the literature values including the maximum growth rate of autotrophs, DO yield coefficients of microbes, denitrification rate at 20C°in both cases. Furthermore, simulating results of the two cases show high statistical correlations, examined by linear regression and Pearson’s correlation (P < 0.05), between the simulated and measured outflow values, which indicate that the model not only can reproduce the seasonal trends of DO, BOD5, TN, TSS, and TP concentrations, but also simulate the variations of DO, BOD5, TSS, and TP. Sensitivity analysis reveals that the parameters of microorganisms, maximum growth rates and DO yield coefficients of autotrophic and heterotrophic bacteria, yield coefficient and TOC half saturation constant of heterotrophs, the N content in microbial biomass, and the denitrification rate at 20C°are included to be sensitive factors that affect DO, BOD5, and TN; while sediment diameter is the key influence on TP and TSS. In future studies, further investigations of environmental microorganisms and aquatic macrophytes are expected to improve the accuracy of the model and provide references for constructed wetland management and design. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41242 |
全文授權: | 有償授權 |
顯示於系所單位: | 生物環境系統工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-98-1.pdf 目前未授權公開取用 | 3.25 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。