STUDY ON TOTAL SEDIMENT TRANSPORT BY FLOW

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＦｏｒｎａｔｕｒａｌｒｉｖｅｒｓｗｉｔｈｒｉｃｈｓｅｄｉｍｅｎｔ ,ｔｈｅｍｏｖｅ ｍｅｎｔｆｏｒｍｓｏｆｓｅｄｉｍｅｎｔｗｉｔｈｄｉｆｆｅｒｅｎｔｄｉａｍｅｔｅｒｓａｒｅｃｏｍｐｌｅｔｅｌｙｄｉｆｆｅｒｅｎｔｕｎｄｅｒｔｈｅａｃｔｉｏｎｏｆｆｌｏｗ .Ｇｅｎｅｒａｌｌｙｓｐｅａｋｉｎｇ ,ｔｈｅｒｅｍａｙａｐｐｅａｒｔｈｒｅｅｆｏｒｍｓｓｉｍｕｌｔａｎｅｏｕｓｌｙ ;ｓｕｓｐｅｎｄｅｄｌｏａｄ ,ｄｅｎｓｉｔｙｃｕｒｒｅｎｔａｎｄｂｅｄｌｏａｄ .Ｗｈｅｎａｄａｍｉｓｃｏｎｓｔ…

STUDY ON TOTAL SEDIMENT TRANSPORT BY FLOW

Total sediment transport under the action of flow includes generally three forms of sediment transport, suspended load, density current and bed load. How to realize simultaneously these three forms of sediment movement in an identical physical model was studied in this paper. For the suspended load, fall and pickup similarities were used to design sediment gradation, and similarities of sediment carrying capacity and scouring and depositing time were be insured. For the density current its occurrence condition should be similar, and similarities of sediment concentration and depositing time were insured. For the bed load, sediment gradation was designed by the similarity of incipient motion, and similarities of sediment discharge and scouring and depositing time were satisfied. And a physical model test was conducted.