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035 _a.b10427004
099 9 _aAIT Thesis no. WA-92-31
100 0 _aThana Boonyasirikul
245 1 0 _aMathematical modelling of flow circulation and water quality in the Rajjaprabha Reservoir, Thailand
260 _aBangkok :
_bAsian Institute of Technology,
_c1992
300 _a76, A-9, B-2 leaves
490 1 _aThesis ;
_vno. WA-92-31
500 _aA thesis report submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1992
520 _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.
650 0 _aWater quality
_xMathematical models
650 0 _aRajjaprabha Reservoir
650 0 _aHydraulics
_xMathematical models
700 0 _aTawatchai Tingsanchali,
_eChairperson
700 0 _aSuphat Vongvisessomjai,
_eExamination Committee
700 1 _aTanaka, Hitoshi,
_eExamination Committee
710 2 _aNor Consult International A.S.,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. WA-92-31
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B17300
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