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035 _a.b10227945
099 9 _aAIT Thesis no. WA-83-5
100 1 _aLal, Narendra Kumar
245 1 0 _aEffect of overbank flow on subsidence of flood waves
260 _aBangkok :
_bAsian Institute of Technology,
_c1982
300 _a69 p.
490 1 _aThesis ;
_vno. WA-83-5
500 _aA thesis 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, 1982
520 _aSubsidence of flood peak discharge and flood wave celerity in channels with overbank areas considering f l ow velocity in overbank portions is investigated. Based on dimensional analysis the subsidence of peak flow along the channel and the flood wave celerity is expressed as a function of seven nondimensional parameters each raised to a certain exponent. These nondimensional parameters are related to the widths of the main channel and overbank areas, bankfull depth and conveyance, duration of flood hydrograph and its volume , peak inflow, bankfull discharge, bed slope, Manning' s n coefficients of main channel and overbank flow areas. The exponents of each nondimentional parameters in the subsidence function are evaluated based on the results of the numerical simulations using finite difference method of implicit scheme. The subsidence function developed is tested in the Chao Phraya river from the Chao Phraya dam to Singburi with two set of data of flood flow in 1978 and 1980. Good results are found in these tests. The wave speed function, developed is tested with data obtained from numerical simulations, good agreement of the results are found. However further study considering backwater effects in deriving t he subsidence function and testing these subsidence and wave speed functions in wide range of field data in other rivers are recommended.
650 0 _aFloods
700 0 _aTawatchai Tingsanchali,
_eChairperson
700 1 _aHoshi, Kiyoshi,
_eExamination Committee
700 0 _aSuphat Vongvisessomjai,
_eExamination Committee
710 2 _aThe Royal Danish Government.,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. WA-83-5
856 _3Full-Tex
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B21406
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