TESTING OF THE NEW SANTOSS TRANSPORT FORMULA IN THE DELFT3D MORPHOLOGICAL MODELING SYSTEM

Recently, the SANTOSS practical sand transport model was developed. This paper describes the implementation and testing of this formula in the Delft3D morphological modeling system. This is done based on a compressive set of hydrodynamic and sand transport data from two large-scale Delta Flume experiments. It is shown that the measured net transport is a delicate balance between offshore-directed suspended load due to undertow and onshore-directed near-bed transport due to wave asymmetry and skewness effects. The Delft3D model is able to reproduce the importance of the current-related suspended load for the high-wave cases (leading to offshore breaker bar migration), as well as the onshore net transport for the lower-wave case (onshore bar migration). The mismatch between measured and calculated near-bed transport is most apparent near the breaker bar.