Understanding the Behaviour of Gravity Currents in Tideless Estuaries and Considering the Impact of Sea Level Rise within the Nile Estuary

Mahgoub, Mohamed; Hinkelmann, Reinhard; Rocca, Michele La

doi:10.2112/jcoastres-d-14-00054.1

Cited by 3 publications

(1 citation statement)

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“…Although the dynamics of salt-wedge estuaries is well documented (Geyer and Ralston, 2011), there are hardly any studies available on the impact of SLR on the salt-wedge intrusion. This critical issue has been partially investigated in the Nile Estuary in Egypt (Mahgoub et al, 2014) and Rječina River Estuary in Croatia (Krvavica et al, 2016b). Both these studies showed that the tip of the salt-wedge may intrude further upstream under potential SLR.…”

Section: Introductionmentioning

confidence: 99%

Assessment of sea-level rise impacts on salt-wedge intrusion in idealized and Neretva River Estuary

Krvavica

Ružić

2020

Estuarine, Coastal and Shelf Science

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Understanding the response of estuaries to sea-level rise is crucial in developing a suitable mitigation and climate change adaptation strategy. This study investigates the impacts of rising sea levels on salinity intrusion in saltwedge estuaries. The sea-level rise impacts are assessed in idealized estuaries using simple expressions derived from a two-layer hydraulic theory, and in the Neretva River Estuary in Croatia using a two-layer time-dependent model. The assessment is based on three indicators -the salt-wedge intrusion length, the seawater volume, and the river inflows needed to restore the baseline intrusion. The potential SLR was found to increase all three considered indicators.Theoretical analysis in idealized estuaries suggests that shallower estuaries are more sensitive to SLR. Numerical results for the Neretva River Estuary showed that SLR may increase salt-wedge intrusion length, volume, and corrective river inflow. However, the results are highly non-linear because of the channel geometry, especially for lower river inflows. A theoretical assessment of channel bed slope impacts on limiting a potential intrusion is therefore additionally discussed. This findings emphasize the need to use several different indicators when assessing SLR impacts.

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Section: Introductionmentioning

confidence: 99%