02067nam a2200241   450000500170000000800410001703500150005810000180007324500540009126000520014530000130019749000260021050001440023650200580038052010420043865000540148070000310153470000520156570000450161771000400166281000580170285600650176020260818223440.0130598         th                  eng    a.b106557851 aKim, Ewe Beng10aSuperposition of tidal and flood waves in estuary  aBangkok :bAsian Institute of Technology,c1981  av, 40 p.1 aThesis ;vno. WA-80-7  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology  aThesis (M.Eng.) - Asian Institute of Technology, 1981  aDuring rainy season, the flood superposes the tides in the lower Chao Phraya basin. The basin is relatively flat to retain water for quite a long period. The duration of flood which will affect directly or indirectly  the social activities as well as business transactions of the areas should neither be overlooked nor neglected.  A mathematical model is developed in the present study using the finite difference approximation to simulate the superposition of the flood and tides in the lower Chao Phraya basin. It can be also used as a mean of forecasting flood.  At the same time, the reach of tidal effect is investigated to present the relations among the river discharge, water depth and velocity . They are strongly affected by the river discharge.  The transition flow before the berms are completely inundated is studied by applying the dam-break technique. The overflowing and returning of flow are also investigated using De Marchi and Honma equations. They cause the  variations of water surface elevation to quite an extent.10aUnsteady flow (Aerodynamics)xMathematical models1 aAbe, Tetsuo, eChairperson0 aSuphat Vongvisessomjai, eExamination Committee0 aPrida Thimakorn, eExamination Committee2 aLee Foundation, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. WA-80-7  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B21788