The Parameter Identification of The Triangular Unit Hydrograph at upstream of Da-Jia River.

• Main Authors: Jie-Shu Yang, 楊婕姝
• Other Authors: Teh-Sing Zhang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/t354v7

碩士 === 中原大學 === 土木工程研究所 === 93 === This research decide to use to triangular unit hydrograph that estimated easily and have lower condition to investigate the rainfall hydrograph. The shape parameter m in base time and peak flow is estimated by anglicizing form foreign investigations, not applied to Taiwan. Therefore, this study investigated the suitable range of m value and parameters of recession curve for Taiwan area. The simulated site in this study is watershed of upstream of Da-Jia River, this research investigate the suitable range of the factor of triangular unit hydrograph. Therefore, based on hydrological date of the four typhoons recently, this research developed the program to estimate the m value of each subarea. On the other hand, based on rainfall-runoff model of early six typhoons, this study proved the suitable m value of each subarea. This study that considers the change of base flow makes form rainfall in order to investigate the recession segment. On the other hand, this research also according to the ratio factor between infiltration capacity and base flow to estimated the coefficient of recession. Based on data from four typhoons, this research estimated the better m value in each subarea. According to measurement data form Sung-mao station, Chi-chia-wan station, Nan-hu station and Ho-huan-chi station, the m value in this study estimate is 5.16, 5.51, 6.02 and 4.82 respectively. Based on data from six typhoons on early stages, this research have the better simulation result in the trend of hydrograph, peak flow and time of peak flow.The rate factor between infiltration capacity and base flow is between 0.008~0.012. As coefficient of recession k value of the recession segment is 1.01, the simulation result in this study is approximately closed to practical measurement.