Effect of thickness of planar nozzles on erosion depth of levee soils subjected to plunging water  

作　　者：Chung Rak Song Jinwon Kim James Tyler Kidd Alexander Cheng David Admiraal 

机构地区：[1]Department of Civil Engineering,University of Nebraska-Lincoln,NE 68583,USA [2]Samsung Engineering Ltd,Seoul,Republic of Korea [3]Quality Control Engineer,Cooper Tire,Tupelo,MS 38677,USA [4]Dean of School of Engineering,University of Mississippi,Brevard 227,University,MS 38677,USA

出　　处：《International Journal of Sediment Research》2018年第3期243-249,共7页国际泥沙研究（英文版）

基　　金：Financial support provided by the Department of Homeland Security-sponsored Southeast Region Research Initiative(SERRI)at the Department of Energy's Oak Ridge National Laboratory,USA

摘　　要：In this study, the effect of the thickness of a planar jet on the erosion depth when the jet impinges on a surface composed of cohesive soil was analytically and numerically evaluated. The results showed that the erosion depth was practically independent of the nozzle thickness for erosion depths shallower than the potential core length （i.e. the region of the jet in which the central flow velocity is the same as the nozzle velocity）. The relation between nozzle thickness and erosion depth was non-linear with con- tinuously variable slope for erosion depths deeper than the potential core length. Finally, the relation was approximately linear when the erosion depth converged to the equilibrium erosion depth. The findings of this study indicate that direct and fast prediction of the erosion depth in the field is possible using the data from a small scale soil erosion test with similar flow velocities.In this study, the effect of the thickness of a planar jet on the erosion depth when the jet impinges on a surface composed of cohesive soil was analytically and numerically evaluated. The results showed that the erosion depth was practically independent of the nozzle thickness for erosion depths shallower than the potential core length （i.e. the region of the jet in which the central flow velocity is the same as the nozzle velocity）. The relation between nozzle thickness and erosion depth was non-linear with con- tinuously variable slope for erosion depths deeper than the potential core length. Finally, the relation was approximately linear when the erosion depth converged to the equilibrium erosion depth. The findings of this study indicate that direct and fast prediction of the erosion depth in the field is possible using the data from a small scale soil erosion test with similar flow velocities.

关 键 词：Nozzle thickness Levee erosion Erosion depth Plunging water Planar nozzle 

分 类 号：P333.2[天文地球—水文科学] S157[水利工程—水文学及水资源]