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0ffice 0perating acoustic air gun AMDRIL amplifier array beach bottom loss Bristol Channel cargo Channel coastal conducted continental shelf core cost Crown Estate Commissioners deposits depth developed direct P-wave discharge electrodes environment environmental feet Figure fisheries formation factor Geological geophysical gravel dredger harbor hopper horizontal geophone Hoveringham Hydraulics Hydrographic Hydrographic Department hydrophone industry Laboratory License marine sediments material measurements mining MMTC Model navigation normally North Sea obtained offshore operations P-wave percent porosity port problems production properties pump records Reflection Coefficient Research resistivity sample sampler sand and gravel sea dredged aggregates sea dredgers sea dredging sea floor seabed seawater sediment shear-wave velocity shell ship shipboard signal South Coast Suction Dredger surveys tape Technology Thames Estuary time-distance tion tons treatment plant unconsolidated United Kingdom vertical geophone vessel voltage wave