Author(s): P. Novak

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Abstract: Channel morphology is the result of the interaction -within geologicalconstraints -of streamflow and sediment properties.The prediction of thegeometry of rivers,particularly of their cross-section(shape,width,depth)and slope expressed as a function of sediment size and discharge has been weliresearched and reported in numerous publications. The two approaches tochannel stability -the critical tractive force theory,usually associatedwith coarser sediments,and the regime concept often originally associatedwith finer sediments -have been discussed by many researchers and studiedboth in laboratory and field conditions(see e.g.Ackers,1983): Theinclusion of the variability of the flow into this relationship is usually(ifat all)approached through the concept of dominant discharge representing thewhole spectrum of variable flows by a single value.Although a great advanceon the linking of the channel geometry with a single arbitrary and constantdischarge,the concept of dominant discharge aTone cannot account for the ful1effect of flow variability. This thesis is being discussed against thebackground of some experimental and field work,theoretical studies andmathematical modelling carried out in the Department of Civil Engineering atthe University of Newcastle upon Tyne under the author's direction.

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Year: 1991