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Character Analysis and Experimental Verification of Stepped Detention Volumes
|關鍵字:||stepped detention pond;階段式滯洪池||出版社:||土木工程學系||摘要:||
3. 相對最小滯洪容積Sp'，可利用試驗與數值之迴歸式(5-3a)、(5-3b)求得，並與吳氏之無階段式設計之試驗資料比對，得知在無因次出流洪峰 約等於0.45時，有較佳的滯洪容積縮減效益。
The purpose of the study is to explore the design of stepped detention ponds so as to reduce the demanded pond volume and to relieve the peak flood under the consideration of safety. In the study, the detention pond system contained two separated pond spaces. A simplify model and a hydrological model were used to calculate the smallest detention volume of the pond. By introducing six different triangular inflow hydrographs (T1~T6), furthermore, a series of detention pond experiments (120 runs), with four different inside pond widths ( =14~20cm) and four different full water-levels ( =18.7 ~26.2cm) of the outer pond as well as five types of spillway outlets ( =1.0~3.3cm), were performed to verify the results of the former models. The conclusions are summarized as follows：
1. As confirmed by the experiments, the hydrology continuity equation according to the Runge-Kutta method can be adopted to evaluate the minimum detention volume of the pond ( ) accurately. Moreover, equations (3-19) to (3-21), proposed in the simplified model, can be handily used to calculate the dimensionless inside detention pond volume ( ), outside detention pond volume ( ) and the minimum detention volume ( ).
2. The results of the series of flume experiments show that the extent of peak reduction becomes more significant as and decrease. In addition, the detention volume reduction ratio (δ) becomes smaller as decreases.
3. The regression equations (5-3a)、(5-3b) can be applied to obtain the relatively minimum detention volume ( ). Compared with the experimental results by Wu, it shows that stepped detention pond system is beneficial to detention volume reduction as the dimensionless outflow peak discharge ( ) is about 0.45.
|Appears in Collections:||土木工程學系所|
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