| Summary: | 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.
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