Author(s): Tadashi Utami; Masaharu Awa; Manabu Sawada
Linked Author(s): Tadashi Utami
Keywords: Erial photograph; Flood flow; River-bed topography; Large-scalevortex; Sediment deposition
Abstract: Aerial photographs of 1998 flood flow in the Tone River was analyzed by the cross-correlation method to obtain velocity vectors distribution over the whole flow surface. The structure of large-scale vortices observed in the photographs were made clear by comparing the streamline patterns, and the map of the vorticity and the divergence calculated from the obtained data. On the other hand, the topographical map of the river bed shows characteristic configurations that the contour lines shows wavy patterns. In the conclusion, it was shown that these river-bed configurations are formed by the local sediment deposition due to large scale vortices.
Year: 2001