SPATIAL DISTRIBUTION OF TRANSPORTED SEDIMENT IN CHANNELS WITH VEGETATION

Spatial distribution of transported sediment in channels with vegetation was investigated with attention focused on sediment sorting via field observation at the Kizu River. Results are summarized as follows.(1) Cross-sectional averaged bed elevation has not been changed in Kizu River. On the other hand, cross-sectional bed geometry has been changed dramatically because of the change of spatial distribution of transported sediment.(2) Sediment deposition near the boundary between vegetated area and non-vegetated area is much and the deposited sediment is overpass load.(3) Sediment deposition at the center of vegetated area is few and the deposited sediment is wash load.(4) Bed deformation in non-vegetated are caused principally by overpass load.(5) Downstream-fining of sediment size was observed in vegetated area located near main flow.