Abdelazim Negm

Hydrodynamic modeling of outlet stability case study Rosetta promontory in Nile delta

Abstract The hydrodynamic features of Rosetta promontory are simulated numerically to minimize the outlet siltation problems. Many coastal structures (i.e. revetments, groins) are used to solve the erosion of the shoreline and siltation in the outlet. However, the shoreline along the promontory is still unstable and these structures did not achieve the expected results to reduce the problem where the erosion problem is shifted down drift. In this research three potential solutions were investigated. The first solution is to apply a soft approach in term of re-establishment of natural hydrologic conditions such as providing additional water discharge processes through diverting Burullus drains to the end of the estuary to achieve the nature and stable condition for the promontory. The second proposed solution is to reach the equilibrium cross section of the outlet by dividing the Rosetta outlet into two parts by constructing two 500 m separated jetties. The third solution is to control the sedimentation in the outlet by constructing 450 m length jetty attached to the eastern bank of the estuary. Numerical Coastal Modeling System (CMS) was used after tuning the model parameters to check the feasibility of the different proposed solutions on the stability of outlet channel. The study shows that an additional discharge of 47 m3/s in the first scenario results in a stable outlet cross section suitable for navigation purposes but with limited effect on the erosion problem.

Egyptian Fishing Ports Challenges and Opportunities Case Study: Mediterranean Sea Ports

Fisheries are considered one of the important sources of national income in Egypt. The fishery operates vast tracts of more than 13 million acres and varies according to the nature of these sources, such as Mediterranean Sea, Red Sea, lakes and the Nile River. There are 21 Egyptian fishing ports and marinas located on both the Mediterranean coasts and lakes. Only five of these ports have minimum requirements of infrastructure and facilities for accommodating catches, fishing boats, and equipment. This study aims to present the current environmental, planning, and facilities issues for four of the existing artificial and natural Egyptian fishing ports that are located on the Mediterranean Sea in terms of challenges and opportunities. The data are collected from different sources such as the annual reports of the Egyptian General Authority for Fish Resources Development, discussion, and personal interviews with the main stakeholders, and through field survey and visual observation. The results show that the investigated fishing ports are suffering from degradation of catch rates, increase of pollution levels, master planning issues, sedimentation issues, and deterioration of the basic infrastructure as well as a great variance of available facilities. The results spotlight the current conditions of fishing ports in Egypt. In addition, the need for further research to investigate the possibility of improving the offered facilities and the port efficiency towards transfer of Egyptian fishing ports into sustainable and greener ports is presented.

Testing A Combination Of Hard And Soft Measures To Enhance The Stability Of Rosetta Outlet

This paper is an extension of the different tested alternatives of coastal protection measures aims to reach a stability condition around Rosetta promontory, Egypt. Rosetta inlet suffers from coastal problems represented in shoreline erosion, and siltation inside the inlet. Rosetta Promontory was created by sediment transported along the Nile River and delivered to the coast by the Rosetta branch. Following a long period of accretion, the promontory began to erode in the mid-1900’s, particularly, after building the Aswan high Dam in 1964 that detained the sediments and the water behind resulting in such problems. This study investigates different alternatives of hard and soft measures attempting to find an optimal solution for these problems (erosion, and accretion) to enhance the stability of the promontory. The simulation of the study area was carried out using a 2D dimensional model (Coastal modeling system). This model was calibrated and validated using different data collected from: Coastal Research Institute (CoRI), Coastal protection authority, Hydraulic Research Institute (HRI), and Nile Research Institute (NRI). The different scenarios have been simulated, and compared based on the morphological changes, wave characteristics, construction cost, and environmental effect.