Abstract
The delivery and yield of coarse sediment (sand and gravel) in the Santa Clara river have been studied through mathematical modelling of spatial and temporal variations of sediment characteristics for time-dependent fluvial process-response. The interactive effects on sediment yield due to sand and gravel mining, a major grade-control structure, and the dams in the drainage basin are integrated in the mathematical modelling. The simulation results are useful for identifying river reaches subject to potential erosion and deposition. They are also useful for obtaining mean annual yields at different river locations. The mean annual yield computed for the most seaward cross section is representative of the mean annual delivery to the coast. The study illustrates how scour and fill of the channel bed are accompanied by significant changes in channel width, which may contribute significantly to sediment storage. Thus sediment storage can be quantified by an erodible-boundary model, as opposed to an erodible-bed model.
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