A model for predicting dredging requirement in the Westerschelde
Wang, Z.B.; Jeuken, M.-C.J.L.; Kornman, B.A. (2003). A model for predicting dredging requirement in the Westerschelde, in: Proceedings of the International Conference on Estuaries and Coasts 2003 (IRTCES), Zhejiang Institute of Hydraulics and Estuary, Hangzhou, China, November 9-11, 2003. pp. 430-435
A substantial annual dredging is required in the Westerschelde Estuary to maintain the shipping lane to the harbour of Antwerp. A key issue in considering a new enlargement of the navigation channel is the prediction of the required maintenance dredging as a function of the required depth of the navigation channel. Especially because the dredged sediments have to be disposed elsewhere in the estuary, this strongly influences both the morphology and the ecology of the estuary. This paper presents a new method for predicting the required maintenance dredging, based on the hybrid modelling approach of ESTMORF (Wang et al., 1998) and ASMITA (Stive et al., 1998). The model shows that not only the required channel depth but especially the associated surface area influences the amount of maintenance dredging. The model explains why a purely empirical method overestimates the dredging amount since the last enlargement of the navigation channel. First analysis and comparison with the field observations in the Westerschelde Estuary show that the model has the potential to become a predictive tool for dredging requirement, with a much better accuracy than the existing methods.
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