Analysis on Peak Flows of Various Return Periods at Gauging Stations-Kaoping River Basin

• Main Authors: Huang Yurng-Pirng, 黃傭評
• Other Authors: 王裕民
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/80782383020502808595

碩士 === 國立屏東科技大學 === 土木工程系碩士班 === 91 === The study utilizes frequency analysis and unit hydrograph to estimate peak flows of various return periods in the Kaoping river basin. The frequency analysis includes Two-parameter lognormal distribution, Three-parameter lognormal distribution, Pearson type Ⅲ distribution, Log-Pearson type Ⅲ distribution and Gumbel Extreme value typeⅠdistribution. The unit hydrograph includes SCS Dimensionless Hydrograph and Triangle Unit Hydrograph, and accompanies with the semi-log regression analysis. At last, by rational synthesis, the variations between frequency analysis and unit hydrograph are combined for estimating peak flows of return period with good accuracy in the Kaoping river basin. The frequency analysis utilized in the study is annual maximum record of five gauging stations in the basin. The records were all passed through some statistical tests. These tests include student test and extraordinary test. The Least Square (SE) method is used for the test of goodness of fit for five selected distributions. The results show that the best fitted distribution at gauging stations of Kaoping Bridge and Tachin Bridge is Log-Pearson type Ⅲdistribution, and Yuemei, Santimem, Launung is Gumbel Extreme value typeⅠdistribution. An example of 100 year return period, after rational synthesis, the discharge of Yueme, Launung, Santimem, Tachin Bridge and Kaoping Bridge is 6,370CMS, 7,360 CMS, 4,980 CMS, 5,820 CMS and 21,900 CMS respectively. According to the flood hydrograph calculated by the SCS Dimensionless Hydrograph, it shows that the arrival time of peak flow is earlier at those gauging stations, when comparing with previous study in the Water Resources Agency.