The paper presents a two dimensional coupled one dimensional numerical model to simulate inundation and sediment deposition over the paddy field considering the effect of channel network. The results show that the roads in the research area have significant influence to flood propagation and sedimentation; Main suspended load deposition happened near the inflow point and along the flow direction, the maximum deposition thickness on the ground surface is over 50 cm. And the sedimentation mode, that is the main deposition area and deposition thickness in the channels is similar to that on ground. The capacity of channel network and crop harvest may be seriously affected by the deposited sediment.
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