| Title |
Examination of Radar Rainfall Accuracy of Busan Small Rain-radar for Urban Flash Flood Forecasting |
| Authors |
윤정수(Yoon, Jungsoo);황석환(Hwang, Seok-Hwan);강나래(Kang, Narae);김석현(Kim, Seokhyeon) |
| DOI |
https://doi.org/10.12652/Ksce.2025.45.6.0675 |
| Keywords |
소형 강우레이더; Solid State Power Amplifier(SSPA); 도심지 돌발홍수; 레이더 강우 정확도 Small rain-radar; SSPA(Solid State Power Amplifier); Urban flash flood; Accuracy of radar rainfall |
| Abstract |
Urban watersheds have hydrological characteristics such as shorter lag time and larger peak flow and runoff volume compared to natural watersheds because of the large impervious surface area. Stormwater drainage systems and pumping stations, therefore, are being operated to respond to the hydrological characteristics of urban watersheds. However, these structural responses are limited in responding to extreme rainfall exceeding the design rainfall due to cost limitations. Recently, Ministry of Environment(ME) introduced a small rain-radar (X-band dual-polarization radar) to resolve observation gaps and respond to urban flash floods. Small rain-radar is more suitable for flood forecasting in urban areas than large rain radar (S-band dual-polarization radar) because spatio-temporal resolution of the small rain-radar is more higher. Therefore, this study examined the radar rainfall accuracy for urban flash flood utilization of Busan small rain-radar using Solid State Power Amplifier(SSPA). To this end, 38 rainfall events were applied to the accuracy review of radar rainfall. The quality of radar polarimetric variables(reflectivity, differential reflectivity and specific differential phase) provided by the small rain-radar and the accuracy before and after bias correction of the variables were examined. As a result, the accuracy of radar rainfall estimated by the speccific differential phase(KDP) algorithm was the highest, and the accuracy of the Joint Polarization Experiment(JPOLE) algorithm was also improved after bias correction. |