APPLICATION OF TWO DIMENSIONAL FLOOD ANALYSIS TO THE DYNAMIC OF WAFER AND SEDIMENT IN THE KUSHIRO MIRE

Abstract

River channelization and agricultural development have been gradually shrinking the Kushiro Mire that is the largest wetland in Japan, mainly by supplying suspended sediment. The objective of this study is to develop and apply the two-dimensional flood model for wetland based on the shallow water theory, including fine suspended sediment transport process. The model was adapted to the part of Kushiro Mire where the Kuchoro River flows.For both the spatial distribution of the inundated area and the suspended sediment concentration, the results simulated by the model showed the good agreement with the distributed maps obtained from the spectral mixture analysis using TM LANDSAT image. However, the digital elevation model used in this study probably has so low accuracy that the fluctuation of water level during flood was not simulated at the inside area located away from the river bank except for the peak value and timing of flood peak.