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《Journal of Yangtze River Scientific Research Institute》 2005-05
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Theoretical Study on Kaman Constant in Sediment-Laden Flow

HUANG Cai-an~1,GONG Min-fei~1,CHEN Zhi-Chang~2,QIAN Wen-kang~1(1.College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China;2.Department of River and Harbor Engineering,Nanjing Hydraulic Research Institute,Nanjing 210024,China)  
Velocity distribution in sediment-laden flow,especially its Karman constant,is one of the most important issues in fluvial hydraulics.The measured data show that the velocity distribution in sediment-laden flow still obeys the logarithmic distribution law,but the Karman constant is smaller than that of clear water in main flow(region,) and almost is same as that of clear water in near bed(region.) Based on the introduction of sedimentgrain shear stress,a unified velocity distribution model,which is suitable for both main flow region and near bed region,was derived from theoretical analysis.By use of this model,it is demonstrated that the Karman constant is varied in vertical distance from near(0.4) in near bed region to below(0.4) in main flow region.Also a theoretical expression for Karman constant in main flow region is given,which considers the Karman constant in main flow region to be associated with sediment concentration and sediment diameter in near bed region.The results from this equation of Karman constant agree with measured data.
【Fund】: 江苏省高校省级重点实验室开放课题(KJS01060)
【CateGory Index】: TV142
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