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Study on the Flow Characteristics on the Boundary Layer and the Sediment Movement Under the Wind Waves

Author: MaLiJun
Tutor: HuXuYue
School: Changsha University of Science and Technology
Course: Port, Coastal and Offshore Engineering
Keywords: Near the bottom of the water flow characteristics Incipient Velocity Suspended sediment concentration distribution High concentrations in the near-bottom sediment layer Storms simulation
CLC: TV142
Type: Master's thesis
Year: 2011
Downloads: 43
Quote: 0
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Abstract

Storms role is one of the main motivating factors affect the Lake District sediment resuspension of sediment resuspension , transport and diffusion , deposition, likely to cause Lakes region of the port , waterway silting ; changing the illumination of the water , causing secondary pollution of the water body , triggering the environment of aquatic organisms change series of reactions , a major impact of the lake ecosystem . Wave tank simulation measured the East Dongting storms , study , explore the hydrodynamic mechanism of disturbance in Dongting Lake bottom fluid mud resuspension storms near-bottom water flow characteristics , analyzing fluid mud starters diffusion process , given the starting Criterion . Studies for the analysis of the space-time transformation of the elements of water and sediment in the Dongting Lake area , the bottom of the lake morphological evolution forecasting and environmental protection , lake remediation have certain theoretical significance and engineering reference value . Study found that the the instantaneous vertical winds and waves near-bottom water layer phase difference between velocity and longitudinal velocity , and the phase difference gradually increased with the distance to the end of increasing distance results with a slight wave theory ; near-bottom water layer phase difference constant π / 2, consistent with a slight wave theory ; slight wave theory resulting significant wave near - bottom velocity measured maximum bottom velocity is closer , show that the approximate calculation of the wind and waves maximum near-bottom flow rate with a slight wave theory ; the comparative experimental observations circumstances and Dou theoretical calculation the Incipient Velocity , found with instantaneous flow rate description of the near-bottom sediment starting conditions are not appropriate , effective flow rate for a long time instead . After analysis , the calculated flow rate values ??storms average wave elements slight wave theory to describe the sediments of the response , consistent with the experimental observation of the phenomenon , also with Dou formula calculated value is closer to actually use this method to distinguish sediment starting situation ; hanging qualitative shift perpendicular silt content in line with the exponential distribution form , gradually increasing since the bed -oriented ; presence of high concentrations of sediment layer the bottom of the water body , the upper limit may be suspended sediment concentration distribution of the turning point of the curve to define ; combined with the observed experimental data established high concentrations containing the relationship between the thickness of the layer of sand with each wave elements used to calculate the high concentration layer thickness ; known bed suspended sediment concentration , water vertical distribution of suspended sediment concentration by high concentrations of sandy The layer is divided into two parts .

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