dc.contributor.author | Krhoda, George O | |
dc.date.accessioned | 2013-08-12T06:38:22Z | |
dc.date.available | 2013-08-12T06:38:22Z | |
dc.date.issued | 1985 | |
dc.identifier.citation | Krhoda, George Okoye. Flow behaviour in model open-channel bends and implications for lateral migration in rivers. Diss. Theses (Dept. of Geography)/Simon Fraser University, 1985. | en |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/55616 | |
dc.description | Thesis submitted in partial fulfillment of the requirements for the Degree of Doctor in Philosophy | en |
dc.description.abstract | An investigation was conducted at he Burnabay mountain Experimental watershed at Simon Fraser
University to study flow behavior of single and consecutive model open- chanel bends with curverture
ratio combination of 1.0<rc/w<4.7. Detailed measurements of velocity, curent direction and bed
topography were colected from more than ten cros sections in each bend.
The total bend deflection angles varied betwen 75 and 180 degres. The results of data analysis are
presented in isovel paterns, vertical and longitudinal variation of velocity, shear stres and friction
coeficients.
The transverse secondary flow advection upstream of the bend becomes apreciable at 30 degres and
is maximizes at 60 degres. Betwen 80 and 120 degres, the transverse secondary flow decreases to its
former magnitude at he straight entrance; shear stres and boundary friction both decrease also. These
flow parameters are periodic every 30 to 60 degres of the bend. Hickin’s postulate on the shift of the
core of maximum velocity is verifed in single and upstream bends but he downstream bends are
influenced by inherited structure which delays the cros over and the location of the fuly developed
flow zone. Bends of rc/w>2.7 generate an ascilatory flow stracture with relatively higher amplitudes
than tighter bends | |
dc.description.abstract | | |
dc.language.iso | en | en |
dc.title | Flow behaviour in model open-channel bends and implications for lateral migration in rivers | en |
dc.type | Thesis | en |
local.publisher | Department of Geography and Environmental Studies | en |