Effect of vegetation on the mobility of riverbed material and the development of longitudinal grooves

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Sediment transport on the riverbed of the Metoba River, flowing in the urbanized area of Matsumoto City, is influenced by vegetation. On the vegetated (Phragmites japonica) riverbed conveyance of coarser gravel was dominant during flooding in the spring to summer rainy season, and resulted sediments were found in the fall to winter dry season as gravel-floored longitudinal grooves in the vegetated area. A flume experiment indicates that the mobility of coarser fraction of bedload becomes higher on a vegetation-covered bed than on a non-vegetated gravel/sand bed. Once a larger grain flowed down on a vegetated riverbed, a continuous path for both coarse and fine material was established forming a gravel ribbon, then it changed into a longitudinal groove later.
日本堆積学会の論文