Runoff Analysis of an Urban Drainage System Using Radar Rainfall: A Case Study of the Guro-Gu Town Drainage System, Seoul, Korea

• 발행기관: 한국방재학회
• 저자명: Narae Kang Yonsoo Kim Hui Seung Noh Hung Soo Kim
• 간행물 정보: 『Journal of Disaster Management』Journal of Disaster Management Vol.1 No.4, 19~27쪽, 전체 9쪽
• 주제분류: 공학 > 기타공학
• 파일형태: PDF
• 발행일자: 2016.10.31

영문 초록

Rainfall has recently begun to show different properties in space and time. In particular, although localized heavy rainfall is frequent, rain gauges on the ground can only observe rainfall at one point. In other words, ground-based rain gauges have limitations in spatial and temporal resolution for measuring rainfall. As a result, there is a need to utilize radar rainfall measurements that can consider the spatial distribution of the change in rainfall based on the direction of the storm. In this study, we tried to apply radar rainfall for a runoff simulation of an urban drainage system. The study area was Guro-gu, Seoul City, Korea, and we divided the study area into sub-basins based on the rain gauge network of the AWS (Automatic Weather Station). Then, the radar rainfall data were adjusted using the rainfall data of the rain gauge stations, and the areal rainfall amounts were obtained. The runoffs were simulated using the XP-SWMM model in the sub-basins of an urban drainage system. As a result, the adjusted radar rainfalls underestimated the ground-based measurement data by 60 to 95%. Therefore, differences in runoffs simulated by the adjusted radar and the gauge rainfall amounts are found. The peak runoff time from the radar rainfall occurred earlier than that from the gauge rainfall. This result is due to the fact that the radar rainfall can reflect the spatial variability of the rainfall in time by taking into consideration the movement of a storm.

목차

INTRODUCTION

RADAR RAINFALL ADJUSTMENT TECHNIQUE AND VERIFICATION METHOD

THE CASE STUDY

CONCLUSION

키워드

Radar Rainfall Rain Gauge Urban Drainage System Spatial Variability