The Stable Width Study On Gravel River

It's very important problem to determine the river width in the channel regulation works.Because of having quite difficult,few studied in depth the width of the high gradient gravel river.The passage combines fluid test and the measured data of gravel river at home and aboard,in the maximum sediment discharge rate and channel morphology two ways, sduties systematically the stable width of the high gradient gravel river according to some of knowledge,just Mechanistic of riverbed evolution,Fluvial dynamics,Hydraulics and so on,and applies the research to the Shima river channel regulation works.In order to studying in depth,we lay out 37 groups test.It's necessary to control strictly test accurcy,and measuring method and result.Analysing preliminary the river width diversification with time extention and deformation feature of riverbed,it provides the data basis to study stable river-width.Combining 37 groups of fluid test data and 88 groups of the measured data of gravel river at home and aboard,the passage sduties the river-width of the high gradient gravel river. The study shows the river-width of the high gradient gravel river adjusts mainly with discharge,riverbed material and gradient.In 3 factors,the dischage affects most,the riverbed material followed,and the gradient least.Having read and analysed research before of using sand discharge rate to calculate river width,we find out their shortage.According to the law of water-sediment movement, it establish the mathematical model that utilizes the most sand discharge rate to solve river width.With the latest research of bed resistance,use Einstein amended equation (2007),Meyer-peter equation and Ackers equation to caculate the river width when the sand discharge rate is the most.With the calculation result of two methods of the most sand discharge rate and channel morphology,it layouts 4 Fengjie County Shima river regulation width plans that is 80m,60m,40m and 30m respectively,and conducts sysematic study about them. The rerearch shows 40m plan is the best according to comparison with the depth and width of scour,the least discharge of passing through the whole cross-section,flow water and vecocity.The Shima river width of equilibrium of sediment transportation is bewteen 40 m and 60 m.It is consistent with calculation result.