Abstract
The potential for flood and sediment material is strongly affected by river meandering and changes in land use. Therefore the modelling pre-channelization and land use change are important with respect to prediction of flood, sediment yield and its on-site consequence. A combination of land use transformation maps and soil properties shows certain decision rules for the conservation of forest into arable or vice versa. The proposed model obtained from this study was used to simulate possible past and/or future pre-channelization and land use patterns. Consequently, the outcome of this simulation was employed to assess flood, sediment material and eroded soil risk under different scenarios. Pre-channelization and land use change in the Ishikari river basin were analyzed by comparing three scenarios. The results indicate that pre-channelization has a significant impact on flood peak discharge, but no significant effect on sediment yield. In contrast, land use change has no significant effect on flood and sediment yield for Ishikari river basin.
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