Abstract
During floods, suspended wash load hardly deposit on a rough bed in fluvial-fan rivers but it often deposit near vegetated areas. When there is an isolated vegetated area, wash load deposit behind the vegetation. During the, period with small discharge after flood, the sand-deposited area is exposed to the invasion of vegetation and the vegetated zone becomes longer. Then, the next flood deposit sand further behind the vegetated area to prolong it. When the vegetated zone becomes long enough, the flow accelerate behind it and no longer the deposition occurs. Such an interaction among flood flow, river morphology and vegetation is the most important key to form the habitat in rivers.
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