Influence of different structural modulation scenarios on morphology change within tidal inlets (Case study: Bardawil Lagoon, Egypt)

Abstract

This paper was specially written to complement the first part series published by (Nassar et al., 2019), to investigate the impact of anthropogenic changes around tidal entrances on sedimentary mass stocks in response to the successive pressures of decision-makers due to the sensitivity of the issue. The CMS package was therefore used to model coastal processes at the Bardawil Lagoon Western inlet1 and to forecast sediment-logical stocks each year such that the accumulation of sediments within the inlet can be mitigated by impeding the navigation of this inlet and by allowing water movement between sea and lake. The CMS package is based on a finite-volume approach. A CMS-Flow and CMS-Wave two steering modules have been introduced. In this analysis, unorthodox structural scenarios inside the tidal inlets were evaluated: extension of the jetties, flow-diverted wall (FDW), current deflector wall (CDW), sediment trap (ST), radial channels (RC) and lateral wide channel (LWC). Following the current posture of inlet 1, the use of CDW, ST or RC was considered to be reasonable compensation for the current dredging operation. This is mostly attributed to a lower infilling pace as well as the fewer dredging at year-end. Whereas the benefits generated from maintenance dredging can be perceived to be slightly costly, the long-term benefits of that expenditure can justify it.