03340nam a2200265   450000500170000000800410001703500150005810000240007324501040009726000520020130000240025349000270027750001510030450200580045552021420051365000390265565000260269465000360272070000420275670000510279870000450284971000560289481000590295085600650300920260818154604.0170698         th                  eng    a.b104270040 aThana Boonyasirikul10aMathematical modelling of flow circulation and water quality in the Rajjaprabha Reservoir, Thailand  aBangkok :bAsian Institute of Technology,c1992  a76, A-9, B-2 leaves1 aThesis ;vno. WA-92-31  aA thesis report submitted in partial fulfillment of the requirement for the degree of Master  of Engineering, School of Engineering and Technology  aThesis (M.Eng.) - Asian Institute of Technology, 1992  aA multi-layer 2-D depth average mathematical model is applied to simulate the  flow circulation and water quality condition in the Rajjaprabha reservoir in June, 1990.  The multi-layer approach is used by dividing the reservoir water body into three layers.  Each layer is fixed in space and the hydrodynamic condition is governed by the  two-dimensional depth average continuity, momentum and dispersion equations. Field  data is collected at 6 sampling points in the reservoir and are used as the initial condition  and for comparison with the computed results. The thickness of the top and middle layers  are set to be 10 meters each to represent the significant variation in the concentration  profile of the considered water quality parameter. The remaining depth is considered to  be the bottom layer. The computation of hydrodynamic condition between the adjacent  layers is connected by the interfacial shear stress for momentum transfer and by the  inte1face mass exchange for continuity while the interfacial vertical diffusion is the  linking term for the transfer of water quality between the adjacent layers. Due to very  small flow velocity during dry seasons, the computed flow condition from the  hydrodynamic model is found to have not much influence on the computed water quality  from the dispersion model. The considered water quality parameters are iron contents,  DO (Dissolved Oxygen) and BOD (Bio-organic Oxygen Demand). The computed  concentration is checked with the collected data to verify the model. The calibration of  relevant parameters is can'ied out by adjusting the hydraulic and dispersion parameters  so that satisfactory results of simulation are obtained. It is found that, due to very small  velocities in the reservoir, the model parameter such as ·Manning's n does not have  significant effects on the computed flow condition while for the dispersion model the  most important parameters that control the dispersion process are the prope1ties of  substance namely the settling velocity and the decay rate. Sensitivity analysis has been  carried out to determine the effect of model parameters.  0aWater qualityxMathematical models 0aRajjaprabha Reservoir 0aHydraulicsxMathematical models0 aTawatchai Tingsanchali, eChairperson0 aSuphat Vongvisessomjai,eExamination Committee1 aTanaka, Hitoshi, eExamination Committee2 aNor Consult International A.S., eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. WA-92-31  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B17300