Abstract
A sediment transport modeling study was made to determine stream channel scour at the proposed Rancho SantaFe Road Bridge on San Marcos Creek in Carlsbad, California. The study was made to determine the potentialstream channel changes during future floods in order to provide the information necessary for bridge design. SanMarcos Creek at the bridge crossing is located downstream of Lake San Marcos. Since the lake detains nearly all thesediment transported in the stream, the channel bed at Rancho Santa Fe Road is susceptible to scour in the future. Todetermine the general scour, it is necessary to consider the flood hydrograph, channel geometry, and sedimentdelivery in the stream channel. The FLUVIAL-12 model was employed to simulate spatial and temporal variations inwater-surface elevation, sediment transport and channel geometry. Scour and fill of the streambed are coupled withwidth variation in the prediction of stream channel changes. Computations are based on finite differenceapproximations to energy and mass conservation that are representative of open channel flow.
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