Cross-shore sediment transport
1 Introduction
In the last decade, several mathematical models for cross-shore sediment transport have been developed under the assumption that the instantaneous sediment transport is directly related to the instantaneous horizontal velocity just above the boundary layer. Although some models took beach slopes into account, most of the calibrated data were from flat-bed experiments, and most experiments were carried out on a rather small scale. Under the framework of the European Large Installation Plan, to achieve high quality and high resolution data on hydrodynamics and sediment transport dynamics on a natural 2DV beach under equilibrium, erosive and accretive conditions, a programme of detailed measurements of hydrodynamics and sediment transport in the surf zone has been carried out in DELFT HYDRAULICS' Delta Flume in the period from April to June 1993 (DELFT HYDRAULICS 1994). Hence a set of new data about beach evolution and acting velocity moments has become available. The objectives of the present study are: (1) to derive the measured cross-shore sediment transport rates from the profile measurements, (2) to predict cross-shore sediment transport rates from measured velocity moments by using several existing mathematical models, (3) to compare the results between measured and computed data and [ if (3) yields a poor comparison ] (4) to propose a modified model. This report is a summary of the work. The report includes profile analysis, the derivation of measured transport rates, the computations of cross-shore transport rates by three selected prediction models and the comparison between measured data and computed results as well as the calibration and verification of the proposed model.
