Projet de Renforcement de la Capacité de Transport Maritime entre Djibouti et Tadjourah Rapport de l’étude préparatoire NATURAL CONDITIONS SURVEY PACKAGE-B PREPARATORY SURVEY ON REINFORCEMENT OF MARITIME TRANSPORT AT GOLF OF TADJOURAH FINAL REPORT DJIBOUTI AND TADJOURAH PORTS REPUBLIC OF DJIBOUTI Prepared for : JICA STUDY TEAM In joint venture 1 Issue for approval O. VICAIRE J. GASSANI 12/10/2018 Rev Description Prepared Checked Approuved Date : Tableofcontents 1 Overview ................................................................................................................................................ 5 Intervention date ................................................................................................................................................ 5 Description .......................................................................................................................................................... 5 2 Materials ................................................................................................................................................ 6 Satellite receivers................................................................................................................................................ 6 Mono Beam and Sub Bottom.............................................................................................................................. 6 ADCP.................................................................................................................................................................... 6 Topographic station ............................................................................................................................................ 6 Wind survey station and software ...................................................................................................................... 6 3 Data collection of existing wind data and Tide Data.............................................................................. 6 4 Data collection of Wave survey by acoustic Doppler current profiler (ADCP) ....................................... 7 5 Bathymetric and Sub Bottom survey ..................................................................................................... 9 5.1 On board safety ...................................................................................................................................... 9 5.2 Global mission schedule ......................................................................................................................... 9 6 SURVEY STAFF ...................................................................................................................................... 11 7 TECHNICAL RESOURCES ....................................................................................................................... 12 7.1 Devices ................................................................................................................................................. 12 7.1.1 Vessel ............................................................................................................................................... 13 7.1.2 Positioning and navigation ............................................................................................................... 14 7.1.3 Single beam echosounder ................................................................................................................ 17 7.1.4 Sub bottom profiler .......................................................................................................................... 18 8 METHODOLOGY ................................................................................................................................... 24 8.1 Geodetic parameters ............................................................................................................................ 24 8.1.1 Horizontal Datum ............................................................................................................................. 24 8.1.2 Vertical reference ............................................................................................................................. 25 8.2 Offsets .................................................................................................................................................. 26 8.3 Survey areas ......................................................................................................................................... 27 8.3.1 Djibouti port ..................................................................................................................................... 27 8.3.2 Tadjourah port ................................................................................................................................. 28 8.4 Intended lines ....................................................................................................................................... 29 8.4.1 Djibouti port ..................................................................................................................................... 29 8.4.2 Tadjourah port ................................................................................................................................. 30 8.5 Geodetic point for GNSS base station .................................................................................................. 31 8.5.1 Djibouti port ..................................................................................................................................... 31 8.5.2 Tadjourah port ................................................................................................................................. 32 8.6 System verification ............................................................................................................................... 33 8.6.1 Control of positioning system .......................................................................................................... 33 8.6.2 Echosounder calibration .................................................................................................................. 33 8.6.3 RTK tide verification ......................................................................................................................... 34 8.7 Real surveyed lines ............................................................................................................................... 35 8.7.1 Djibouti port ..................................................................................................................................... 35 8.7.2 Tadjourah port ................................................................................................................................. 36 8.8 Real surveyed lines............................................................................................................................... 37 8.8.1 Djibouti port ..................................................................................................................................... 37 8.8.2 Tadjourah port ................................................................................................................................. 37 9 DATA PROCESSING AND MAPPING ...................................................................................................... 38 9.1 Data processing .................................................................................................................................... 38 9.2 Mapping ............................................................................................................................................... 41 9.2.1 Submarine morphology .................................................................................................................... 41 9.2.2 Examples of SBP lines ....................................................................................................................... 43 9.2.3 Conclusion for Djibouti area............................................................................................................. 45 9.2.4 Correlation Subottom Geotechnical ................................................................................................ 47 9.3 Tadjourah area ..................................................................................................................................... 53 9.3.1 Submarine morphology .................................................................................................................... 53 9.3.2 Examples of SBP lines ....................................................................................................................... 54 9.3.3 Conclusion for Tadjourah area ......................................................................................................... 57 9.3.4 Correlation Sub Bottom (SBP) geotechnical: .................................................................................... 58 10. Topographic survey ................................................................................................................................. 60 10 APPENDIX ............................................................................................................................................. 61 10.1 Appendix A – Product Test Record ......................................................................................................