Major troubles, as well as their mechanisms, due to flows which contain much sediment are introduced in the beginning.
It is suggested, then, that the primary target of disaster prevention on alluvial cones and fans and water resources development schemes should be to decrease the sediment concentration of the flow.
For this purpose, it is proposed that the dehydration method at the fan-head combined with the fan-segment-shift method on the mid-fan and conventional channel works might be effective and feasible.
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