טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentBelinsky Michael
SubjectCharacteristics of Advection and Diffusion of Particulate
in a Water Column of lakes
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Professor Hillel Rubin


Abstract

In the framework of this research, lab experiments were conducted in order to characterize the distributions of concentrations of suspended solid particles (SSP) in water columns of lakes and reservoirs. The experiments were conducted at an experimental facility representing a reduced model of the water column of lakes and reservoirs. Special attention was paid in this research to the issue of determining the boundary conditions characterizing the bottom of the water column. The lab experiments have indicated that from a number of possibilities of defining the boundary conditions, only the condition of constant concentration (Cs = constant) at the bottom of the water column could be sustained. It is very likely that in many “real world” cases, this condition really takes place in lakes whose bottom represents an infinite source of SSP.

Results of all experiments showed that the SSP, supplied into the lake’s water column, create a nepheloid layer near the bottom. If near the bottom there is SSP that forms an integral part of the water column bottom, then near the bottom the SSP concentration obtains its equilibrium value, and the nepheloid layer is of maximal thickness. The thickness of the nepheloid layer might be smaller or larger according to the decrease or increase of the turbulence intensity, respectively. Therefore, the experiments have indicated that Shields diagram values regarding flow in channels can be useful also for the evaluation of turbulent movements of water and the development of SSP distribution in lakes and large water reservoirs.