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035 _a.b10209505
099 9 _aAIT Thesis no. WA-93-11
100 0 _aLuong Thi Duy Hieu
245 1 0 _aDispersion coefficient for unsteady salinity intrusion in estuaries
260 _aBangkok :
_bAsian Institute of Technology,
_c1993
300 _a135 leaves :
_bill.
490 1 _aThesis ;
_vno. WA-93-11
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1993
500 _aA thesis submitted in partial fulfillment ofthe requirements for the Degree ofMaster of Engineering.
520 _aIn the past dispersion coefficient in the Mekong estuarine system has been firstly assumed to be constant and later on expressed as a function of existing salinity and its gradient along the estuary. In this study some hydrodynamic characteristics are investigated and found to be additional factors describingdispersion coefficient. In the otherword, the salinity gradientplays the mostimportant role in the mixing process between sea and river water; it has the main effect on the behavior of the dispersion coefficient. Turbulence which characterized by velocity is also involved in the dispersion process. Itis found from this study thatdispersion coefficientin Mekongestuarine system can beexpressed as a function in space and in time of parameters such as: salinity concentration, salinity concentration gradient, hydraulic radius, flow velocity. From the computational results, the variation of dispersion coefficient along every branch in the Mekong estuarine system is also specified. That is a very convenienttool forthe estimation ofdispersioncoefficientwhen solving the Advective-Dispersion equation to predict the salinity intrusion in the Mekong estuarine system.
650 0 _aSaltwater encroachment
700 0 _aSuphat Vongvisessomjai,
_eChairperson
700 1 _aGupta, Ashim Das,
_eExamination Committee
700 1 _aTanaka, Hitoshi,
_eExamination committee
700 0 _aSutat Weesakul,
_eExamination committee
710 2 _aThe Government of Denmark,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. WA-93-11
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B16381
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