2:00 PM - 2:15 PM
[AHW34-13] Effect of spatial resolution of rainfall on runoff modeling in urbanized basins: A case study of the Tsurumi river basin, Japan
Keywords:Hydrology, Weather radar, Spatial distribution of rainfall, Hydrological model, Urbanized basin, Runoff
The Ministry of Land, Infrastructure, Transport and Tourism (MLIT) established an X-band polarimetric radar network (XRAIN), which uses an operational data processing system developed by the National Research Institute for Earth Science and Disaster Resilience (NIED). XRAIN is composed of X-band MP (multi-parameter) radars, and has spatial and temporal resolutions of 250-m and 1-min, respectively. This product is one of the best high-resolution radar rainfall systems in the world, considered as an input to the Hydrologic Engineering Center’s Hydrologic Modeling System (HEC-HMS) model to simulate runoff. The model was set up for the Tsurumi river basin (≈117 km2) and it is located close to the Yokohama city of Japan. In this study, we selected some extreme rainfall events to simulate runoff separately. Different spatial resolution of rainfall data were generated from XRAIN radar rainfall for each event and applied into the model. Simulated runoff of each event was analyzed and compared each other separately and few remarks are drawn on using different spatial resolution of rainfall to the hydrological model for small urbanized basin.