Research On The Velocity Distribution Of Sediment-Laden Flow Of U Channel

Most of Irrigated areas in the north of China are arid region, and water shortage is veryserious, many of irrigation water are river runoff. Because of the sediment concentration ofriver flow is higher, so the use of turbid water resources becomes very important. Pastmethods are building settling basin in main canal, but because the sediment is overmuch andclearing silt is very difficult, so it is very needed to develop a new method, and that isregulating and controling sediment reasonably, using muddy water delivery technology anddelivering water to files in irrigation channels. Transporting and regulating sediment inirrigated areas relate to many aspects, and one of them is the velocity distribution andsediment delivery characteristics of sediment-laden flow in main canal,branch canal, lateralcanal and sublateral canal,which is very important. In the mode of water-saving irrigation,lateral canal and sublateral canal always are U Channel, so it is very significant andmeaningful to research on the velocity distribution of sediment-laden flow of U Channel.In this paper, by studying and analyzing the test materials indoor, we want to found thevelocity distribution law of sediment-carrying flow of U Channel and deal with canalsediment effectively, providing the scientific basis for mud treatment in engineering. Themainly research work and results are as follows:(1) On the basis of understanding the questions of silt of canal system in main irrigationareas in the Yellow River basin in China, mastering the basic characteristic of sediment-ladenflow of several major irrigation canal in Shanxi;(2) Through the field survey and data analysis of laboratory experiments, preliminaryunderstood the basic characteristics of sediment-carrying movement of U Channel, andascertained the basic law of velocity distribution of sediment-laden flow, and descript theeffects of change of sediment concentration on vertical and lateral velocity distribution inU-Channel scientifically and quantified, thus theoretically perfect velocity distribution ofsediment-laden flow.(3) Preliminary structured the motion of numerical simulation model of the velocitydistribution of sediment-laden flow of U Channel and simulated the characteristics ofsediment-laden flow quantified in different flow-sediment conditions and Hydraulic geometry condition, providing necessary support for developing and completing the technology ofmuddy lose move and adjustment of water and sediment.