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Port design for the LNG terminal at Jorf Lasfar and Nador, Morocco


In view of the introduction of liquefied natural gas (LNG) in Morocco a feasibility study for a new LNG terminal is conducted. Two locations are examined: Jorf Lasfar at the Atlantic and Nador at the Mediterranean. Various aspects are dealt with: the wave analysis and workability, the port layout and occupation, design of the breakwaters and a global budget estimate. Additionally, the technical specifications for an appropriate bathymetrical survey and for geophysical site investigations are defined.

Wave Analysis
Offshore data are transformed to nearshore data by numerical simulations with SWAN to derive the normal and extreme wave climate inside and outside the harbour. The results are presented as wind and wave roses, wave height vs. wave period histograms and cumulative distributions. From the results, the workability of the LNG vessels is derived as well.

Port Layout
Apart from reducing the wave climate, the port layout should also consider required safety distances, an appropriate entrance channel, location of the jetty, ... Based on a typical time schedule of an LNG vessel, the occupation of the port is calculated. The latter is an important parameter with regard to the feasibility of the project.

Design of the Breakwaters
The main goal of this part is to screen different options in order to provide our client with a site specific and an economical beneficial solution based on comparison of different alternatives. The project area at Jorf Lasfar is characterised by a severe offshore wave climate, defined by an 11.5m offshore design wave and relatively high water depth. In order to determine the main characteristics IMDC uses the formulae and guidelines defined in the Overtopping Manual and the Rock Manual.  Preliminary design results for solutions with Tetrapodes, cubes, Accropodes and Xblocs are compared and 154t cubes are selected, resulting in the cross section of Figure 1. Volume estimates form the basic input for the bill of quantities and a preliminary cost estimate.

Technical specifications in-situ surveys
Technical and contractual specifications for the execution of appropriate bathymetric and geophysical surveys, i.e. high-resolution reflection seismic investigation are prepared. For both survey techniques contractual requirements of the equipment, survey spacing, data presentation and interpretation are described.

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