SPATIOTEMPORAL CHARACTARISTIC ANALYSIS OF X-BAND MP RADAR RAINFALL IN A SMALL URBAN WATERSHED FOCUSED ON THE MOVEMENT OF RAINFALL AREA

Abstract

 This paper presents the analyses of the spatiotemporal characteristics, by comparison of X-band MP radar data with 1-minute ground observation rainfall data, and of the movement of rainfall area by means of advection model analysis, in the upper basin of Kanda river in Tokyo. These analyses established a relationship between the movement of the rainfall area and the spatiotemporal characteristics. In cases like a rainfall caused by a typhoon, where the rainfall area moved with a clear direction, the meshed area of X-band MP radar data containing higher correlation with the ground observation rainfall data described spatiotemporal movement associated with the movement of the rainfall area. In contrast, in cases of atmospheric instability, the meshed area of X-band MP radar did not show a specific spaciotemporal trend and the meshes surrounding the observation station showed a higher correlation instead of the overlapping mesh.