| 研究生: |
林明坤 Lin, Ming-kun |
|---|---|
| 論文名稱: |
南科園區滯洪池可靠度之個案研究 Case Study for the Reliability Analysis on the Detention Ponds in Southern Taiwan Science Park |
| 指導教授: |
唐啟釗
Tang, Chii-jau 丁舜臣 ting, Shun-chen |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 水利及海洋工程學系碩士在職專班 Department of Hydraulic & Ocean Engineering (on the job class) |
| 論文出版年: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 76 |
| 中文關鍵詞: | 可靠度 、滯洪池 |
| 外文關鍵詞: | Detention pond, reliability |
| 相關次數: | 點閱:62 下載:4 |
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由於區域性的開發,會改變地表本來具有之滲透能力。開發區之不透水面積增加,當暴雨來臨時總地表逕流量增大集流時間縮短,洪峰流量亦相對地提高,因而造成開發區下游排水系統的負擔。南部科學工業園區,由於天然地勢低窪,區內設置滯洪池。
每次調洪過程中,若滯洪池水位曾經漫溢過預設水位,(例如,A池超過EL+4.20m,B池超過EL+4.75m),則認為該滯洪池未能達成預期功能效用。此時判定該滯洪池為喪失功能效用,是此類「功能效用」模式的失敗狀態。反之,若滯洪池水位一直維持在預設水位之下,則達成預期功能效用,是此類模式的安全狀態。可靠度即為該滯洪池,維持為安全狀態的機率。本文探討園區內A、B兩座滯洪池之調洪可靠度。
藉由雨量資料分析統計求得之統計參數,利用蒙地卡羅法(Monte Carlo Methods) 模擬繁衍多場降雨,模擬模式以雨量及延時兩隨機變數具有相關聯性及無關聯性兩種,分別演算分析滯洪池調洪可靠度。主要研究探討滯洪池之設計最高水位的可靠度分析,其次探討池外渠道計畫流量之可靠度分析,最後探討逕流係數對可靠度分析結果之影響。本文研究分析結果,降雨量與延時兩隨機變數為無關聯性模擬時,所求得之可靠度指標β值較大,滯洪池B之模擬水位,高於計劃水位之可靠度指標β值比滯洪池A來的小,可靠度指標β值隨著逕流係數值之遞增而降低。整體而言滯洪池之可靠度指標β值皆在可接受範為圍內,顯示滯洪池調洪效率可符合需求。
The regional development has changed the water permeability of ground and increased the area of non-permeable surface in the development zone. When a rain storm occurs, the total surface runoff is increased and the time of concentration reduced, and the peak flow is increased accordingly. So the downstream drainage system of the development zone gets a heavier load. The detention ponds have been created in the Southern Taiwan Science Park as it is naturally low-lying.
And the detention ponds would be regarded as failure to reach the expected function if its water lever had ever overflowed the preset water level (e.g. Pond A overflowed the EL by +4.20m and Pond B overflowed the EL by +4.75m). In such case, the detention pond was determined as lack of function, which was the failure status of such FUNCTION model. On the other hand, if the flood level had been maintained under the preset water level, then it had reached the expected function, thus was the safety status of the model. Reliability is the probability that the detention pond to maintain safety status. This paper would discuss the reliability in flood regulation of Pond A and Pond B in the Southern Taiwan Science Park.
Statistic parameters are worked out through analytical statistics of precipitation, and Monte Carlo Methods are used to stimulate rainfalls for analyzing the flood adjusting reliability of the two detention ponds. The stimulation is conducted in two patterns: precipitation correlated or not correlated to time delay. The main objectives of this research are, first, to discuss the reliability of the maximum level of detention ponds; second, to discuss the reliability of the design flow of channels outside the ponds; and finally, to discuss the influence of runoff coefficient on the result of reliability analysis. The findings of this research are as follows: when precipitation is not correlated to time delay, the reliability index β is greater; the value of reliability index β of detention pond B at a simulation level higher than the design level is smaller than that of detention pond A; the value of reliability indexβis reduced as the runoff coefficient is increased. In a whole, the values of reliability index β of the detention ponds are all in the acceptable range, suggesting that the flood adjusting efficiency of these ponds meet the relevant requirements.
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