<b>138.</b> MORPHOLOGY AND STRATIGRAPHY OF A DEGRADING DELTA

Hillen, M.M.; Geleynse, N.; Storms, J.E.A.; Walstra, D.J.R.; Stive, M.J.F.

doi:10.1142/9789814282475_0137

Cited by 2 publications

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“…The reduction in sediment supply often tips the balance between marine and fluvial processes, as reworking by waves changes the abandoned delta's morphology (Figure ). Despite the importance of marine reworking [ Roberts , ] in the preservation of deltaic stratigraphy [ Geleynse et al ., ], there have been few quantitative studies of reworking after abandonment [e.g., Hillen et al ., ]. Here we apply a process‐based model of plan‐view shoreline evolution to characterize the long‐term (centennial to millennial) plan‐view response of a delta to wave reworking after elimination of fluvial sediment load.…”

Section: Introductionmentioning

confidence: 99%

Wave reworking of abandoned deltas

Nienhuis

Ashton

Roos

et al. 2013

Geophys. Res. Lett.

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[1] River deltas and individual delta lobes frequently face reduction of sediment supply, either from the geologic process of river avulsion or, more recently, due to human activities such as river damming. Using a process-based shoreline evolution model, we investigate wave reworking of delta shorelines after fluvial input elimination. Model results suggest that littoral sediment transport can result in four characteristic modes of delta abandonment, ranging from diffusional smoothing of the delta (or delta lobe) to the development of recurved spits. A straightforward analysis of delta shape and wave characteristics provides a framework for predicting the mode of delta abandonment. The observed morphologies of historically abandoned delta lobes, including those of the Nile, Ebro, and Rhone rivers, fit within this framework. Our results provide quantitative insight into the potential evolution of active delta environments in light of future extreme reduction of fluvial sediment input. Citation: Nienhuis, J.

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Section: Introductionmentioning

confidence: 99%