Development and validation of a three-dimensional morphological model

Computer modeling of sediment transport patterns is generally recognized as a valuable tool for understanding and predicting morphological developments. In practice, state-of-the-art computer models are one- or two-dimensional (depth-averaged) and have a limited ability to model many of the important three-dimensional flow phenomena found in nature. This paper presents the implementation and validation of sediment transport formulations within the proven DELFT3D three-dimensional (hydrostatic, free surface) flow solver. The paper briefly discusses the operation of the DELFT3D-FLOW module, presents the key features of the formulations used to model both suspended and bedload transport of noncohesive sediment, and describes the implemented morphological updating scheme. The modeling of the three-dimensional effects of waves is also discussed. Following the details of the implementation, the results of a number of validation studies are presented. The model is shown to perform well in several theoretical, laboratory, and real-life situations.