Dredged Material Placement to Support Sustainable Shoreline Management in the Nile Delta, 2015:

Created at:2021-09-07

Prepared by:Hydraulics Research Institute

The Hydraulic Research Institute "HRI" in collaboration with Coastal Research Institute,"CoRI" and Shore Protection Authority "SPA" has been commissioned to carry out a hydrodynamic and morphological study to maintain the erosion problems in the desired location inside the study area. The main objective of the study is to investigate the impact of dumping the dredged material from the approach navigation channel of Damietta harbour into the active nearshore zone of the study area. A two dimensional hydrodynamic and morphological numerical model (2DH) was developed using Delft3D software package developed by Deltares, The Netherlands, and this package is licensed to HRI. The model was used to compute and predict the morphological changes processes. The model was calibrated based on the field measurements data conducted in 2010 and 2012. Nine model scenarios were carried out to simulate the study area with the dumping processes of the dredged material at different locations with different quantities.The results of the model simulations show the followings: • From the shoreline stability point of view, the nourishment by dumping the dredged material at the shoreline gives better results than the dumping process at the contour depth of -3m. • No significant impact take place inside the approach channel of Damietta harbour due to the dumping process behind the eastern breakwater of Damietta harbor. • Increasing in the rate of dumping at the shoreline or increasing the quantities of the dumped material, will increase the age ofthe stability of the shoreline at the vicinity of the dumping area. • The results of dumping all quantities of the dredged material in the selected location to be act as a sand engine has a small effect in reducing the erosion problem or in the rehabilitation of the shoreline at the vicinity of Ezbit-Elborg comparing with the dumping process directly at the shoreline of this area. Improving the results of using sand engine method could be obtained but needs more investigation.