The effect of section numbers of slope to estimating concentra- tion time

• Main Authors: Yang-Zeng Wang, 王陽岑
• Other Authors: Hung-Pin Huang
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/48474826670828123994

碩士 === 國立臺灣大學 === 農業工程學系 === 82 === In order to study affection of basin main channel section numbers to calculation concentration time, this study, first of all, using second-order curve function simulated dimension- less coordinate of channel longitudinal profile types, then using four types of curve calculated by Rziha, Kirpich and California formulas to compare the differenty of concentration time values, the result show that: 1. Concerned with the regression result of small streams, the longitudinal profile types of dimensionless coordinate agree with symmetric second- order curve in Taiwan area. 2. Using the three formulas calculating, the ｔc* value and E value are increasing while the b value decreasing, and they are increasing while the section numbers doing. 3. Because the curves are symmetric and the same beginning and ending points, producing to the average slopes of all of the curves equal to 1 in different section numbers. So there are not relative between section numbers and the average slopes, and producing to the section numbers of small streams have not obvious effect to estimating result in Taiwan area.