Efficient dredging strategy for channel maintenance of the Guadiana ebb-delta

Garel, Erwan

http://hdl.handle.net/10400.1/10786

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Authors

Garel, Erwan

Abstract(s)

A simplified version of the Inlet Reservoir Model is implemented at the Guadiana ebb delta to define efficient maintenance strategy of the entrance channel. The model is first applied typically to the outer shoal area, reproducing successfully the observed post-jetty volume evolution known from 16 bathymetric grids spanning 47 years. However, the volume of the outer shoal area is too large to be significantly impacted by small dredging-induced variations. Hence, the model is applied to a smaller dredged channel area. Observations indicate that this area reached an equilibrium volume, supporting the suitability of the model to simulate its volumetric evolution (similar to typical model applications). The calibrated model was then used to explore various dredged volume scenario considering a channel volume threshold for safe navigation. The efficiency of each scenario was evaluated based on a dredging performance rate representing the dredged volume normalized to the lifetime of the intervention (i.e., until another dredging is required). Results suggest that the best (cheapest) strategy would consist in dredging a volume of 100,000 m3 that would maintain navigability in the channel during 6 years.