| MODELING UNSTEADY TURBIDITY CURRENTS IN A STEEP NARROW RESERVOIR |
| |
| 作者姓名： | Shaohua Marko HSU Associate Professor Dr. |
| |
| 作者单位： | Shaohua Marko HSU，Associate Professor，Dr. Department of Hydraulic Engineering，Feng Chia University，Taichung 407，Taiwan，China Wei-Sheng YU Environment Section，Agricultural Engineering Research Center，Chungli，Taiwan，China Tzu-Ming LIU Graduate stu |
| |
| 摘 要： | 1.IN~DUCTIONTurbiditycurrentisoneclassofflowsnameddensitycurrentorgravitycurrent(therHunterRouse(Yih(1980)),whichdePictstheintmsionofheaVyfluidintoalighterone.Usually,thedensitydifferencebetWeentWonuidisrelativelysmallandmixingacrosstheimerfaceoccurs.ThedrivingforceofdensitycurrentsisnotdensitydifferenceitselfbutthedifferenceinspeCmcweights.Turbiditycurrentisnamedwhenthedensitydifferenceisespeciallycausedbysuspendedfinesedimentparticles.Sincesediment-ladenflowcaninteraCtwiththelowerbou…
|
MODELING UNSTEADY TURBIDITY CURRENTS IN A STEEP NARROW RESERVOIR |
| |
| Shaohua Marko HSU,Associate Professor,Dr..MODELING UNSTEADY TURBIDITY CURRENTS IN A STEEP NARROW RESERVOIR[J].International Journal of Sediment Research,1997(3). |
| |
| Authors: | Shaohua Marko HSU Associate Professor Dr |
| |
| Institution: | Shaohua Marko HSU,Associate Professor,Dr. Department of Hydraulic Engineering,Feng Chia University,Taichung 407,Taiwan,China Wei-Sheng YU Environment Section,Agricultural Engineering Research Center,Chungli,Taiwan,China Tzu-Ming LIU Graduate stu |
| |
| Abstract: | Plunging turbidity currents can occur under certain conditions when sediment suspension-laden inflow enters a reservoir. This current submerges into the lower portion of the stratified water body and moves downstream. Clear and turbid Water mix across the interface of upper and lower portions. In cases with steep slopes, clear water is entrained by turbulent eddy down to the turbid portion and therefore the discharge of turdity current increases and concentration diluted. Turbidity current is highly unsteady in flood period. In this article, a one-dimensional unsteady model is developed. Three governing equations, including water continuity, suspended sediment continuity, and momentum equation for sediment-laden flow, are solved by MacCormack scheme. Supplemental equations of ambient-water entrainment, bed-material entrainment in two continuity equations and experimental values of friction coefficient in momentum equation are used in solving the thickness of current, layer-averaged velocity, and layer-averaged concentration at different time and locations. With simplified downstream conditions and a flood hydrograph with constant concentration as upstream conditions, numerical experiments were performed to investigate phenomena difficult to be observed in laboratory and in field. |
| |
| Keywords: | Turbidity current Sediment flushing Unsteady flow Numerical modeling |
| 本文献已被 CNKI 等数据库收录！ |
