Effect of urbanization on runoff characteristics of the On-Cheon Stream watershed in Pusan, Korea

✍ Scribed by In Shik Kang; Jun Il Park; Vijay P. Singh

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 290 KB
• Volume: 12
• Category: Article
• ISSN: 0885-6087
• DOI: 10.1002/(sici)1099-1085(199802)12:2<351::aid-hyp569>3.0.co;2-o

✦ Synopsis

This study investigated the eect of urbanization on runo from the On-Cheon Stream watershed in Pusan, Korea. This watershed has been experiencing considerable urbanization since the 1960s. There are two gauging stations in the watershed. For one of the stations there are recent ¯ow data and for the other ¯ow data were observed in the past. A linear reservoir model was chosen and runo was analysed for several ¯ood events. The linear reservoir model has been found to generate ¯ood hydrographs accurately for both gauging stations, and its applicability to the study area has also been established. Using two methods of computing eective rainfall or rainfall excess f-index and constant percentage method), the results of runo analyses were investigated. The f-index method yielded better results than the constant percentage method. A comparison of hydrographs observed in the past with the simulation results at the Ie-Sup bridge site revealed that the peak discharge increased and the mean lag time of the study area decreased owing to urbanization over the past two decades. It is also possible to evaluate the eect of urbanization quantitatively.