Investigation and Application of the Time of Concentration in Watershed

• Main Authors: Huang, Jaw-Chang, 黃兆章
• Other Authors: Chen Su-Chin
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/87164767619816495955

碩士 === 國立中興大學 === 水土保持學類 === 85 === The definition of the time of concentration is the travel time of a wave to move from the hydraulically most distant point in the watershed to the outlet in this research. The theory of the kinematic wave is used to bring out the fact that when the rainfall intensity is varied in time domain, we get the formula of the depth of the water wave and the traveling distance. Under different types of rainfall events simulation, the kinematic wave interprets the hydrologic phenomena with best effect. The hypothetical condition, applicable ranges and the parameters are compared and contrasted in the collection of the formulae of time of concentration from foreign and native countries. Most formulae of time of concentration consider the length and hillslope factors which suggest the importance in the process of deduction. The time of concentration from the comparison is long in the kinematic wave formula; they are short in the experimental formulae. Owing to the completely hydrologic theory of the kinematic wave, the observed rainfall and discharge data with the kinematic wave were simulated in the Lien-hua-chi experimental watershed; the formula of time of concentration in the forest watershed is available after the regression analysis in this research. If we want to set up the formula of time of concentration appropriate for the situation in Taiwan, we have to identify with more observed data.