Application of unit stream power theory to stable meandering and braided reaches of Sefidroud River

摘要

It is important to understand how channel geometry relates to discharge, and to be able to predict how the channel will adjust for a given discharge. This is significant both in a theoretical way, especially in relating channel geometry to given discharges in semi-arid and arid areas, and also in a practical way, for instance in river training and for a variety of instream and external uses. This needs to be able to predict channel geometry led to the development of the concept of regime, which was initially developed with respect to irrigation canals. This concept has since been applied to natural rivers, with the idea of "dominant discharge" being used to represent what discharge the channel is in regime for. Empirical regime equations for stable gravel-bed Sefidroud River were obtained based on data from 32 cross-sections. The stage discharge-rating curve for each cross-section was computed using one-dimensional ISIS hydraulic model. Morphological and sedimentological data were also obtained from field survey to determine stable width and depth from non-dimensional unit stream power theory for braided reaches of Sefidroud River.