Abstract
In recent years, the local heavy storms rise frequently and have caused flood disasters in urban areas in Japan. Due to unexpected and disorderly behavior of the local storms, their actual conditions are unknown from observation by rain-gauge networks on the ground. This research aims to verify the rainfall information by the X-band Multi-Parameter radar, and to clarify the temporal and spatial characteristics of the local storms based on the radar information for consideration of influence on the flood runoff of urban streams. After the accuracy verification of the radar rainfall data by comparing the radar and the ground rain-gauges, efficiency of the average rainfall over watershed based on the rain-gauges are inspected by the radar data in the watershed. From the viewpoint of the random field, the stochastic properties of the heavy storm distributions are evaluated with the variogram of radar data.
