FN Archimer Export Format PT J TI The impact of internal waves on upper continental slopes: insights from the Mozambican margin (SW Indian Ocean) BT AF Miramontes, Elda Jouet, Gwenael Thereau, Estelle Bruno, Miguel Penven, Pierrick GUERIN, Charline LE ROY, Pascal Droz, Laurence Jorry, Stephan Hernández‐Molina, F. Javier Thiéblemont, Antoine Silva Jacinto, Ricardo Cattaneo, Antonio AS 1:1,2;2:2;3:2;4:3;5:4;6:2;7:1;8:7;9:2;10:5;11:5,6;12:2;13:2; FF 1:;2:PDG-REM-GM-LGS;3:PDG-REM-GM-LAD;4:;5:;6:PDG-REM-GM-CTDI;7:;8:;9:PDG-REM-GM-LGS;10:;11:;12:PDG-REM-GM-LGS;13:PDG-REM-GM-LAD; C1 UMR6538, CNRS‐UBO, IUEM, Laboratoire Géosciences Océan Plouzané 29280 ,France IFREMER, Unité Géosciences Marines Plouzané 29280 ,France CACYTMAR. Univ. Cádiz, Avda República Saharaui S/N Puerto Real 11510 Cádiz ,Spain UMR 6523 CNRS, IFREMER, IRD, UBO, Laboratoire d'Océanographie Physique et Spatiale Plouzané 29280, France Department of Earth Sciences, Royal Holloway University of London Egham Surrey TW20 0EX ,United Kingdom TOTAL, R&D Frontier Exploration program Avenue Larribau 64000 Pau ,France UMR6538, CNRS‐UBO, IUEM, Laboratoire Géosciences Océan Plouzané 29280 ,France C2 UBO, FRANCE IFREMER, FRANCE UNIV CADIZ, SPAIN IRD, FRANCE UNIV LONDON, UK TOTAL, FRANCE CNRS, FRANCE SI BREST SE PDG-REM-GM-LGS PDG-REM-GM-LAD PDG-REM-GM-CTDI UM LOPS LGO IN WOS Ifremer UPR WOS Cotutelle UMR copubli-france copubli-p187 copubli-europe copubli-univ-france IF 4.133 TC 32 UR https://archimer.ifremer.fr/doc/00605/71730/70205.pdf LA English DT Article CR PAMELA-MOZ04 BO Pourquoi pas ? DE ;contourite;sediment drift;bedform;sedimentary processes;tide;internal solitary waves;bottom currents AB Evidences of sedimentation affected by oceanic circulation, such as nepheloid layers and contourites are often observed along continental slopes. However, the oceanographic processes controlling sedimentation along continental margins remain poorly understood. Multibeam bathymetry and high‐resolution seismic reflection data revealed a contourite depositional system in the Mozambican upper continental slope composed of a contourite terrace (a surface with a gentle seaward slope dominated by erosion) and a plastered drift (a convex‐shape sedimentary deposit). A continuous alongslope channel and a field of sand dunes (mainly migrating upslope), formed during Holocene, were identified in the contourite terrace at the present seafloor. Seismic reflection data of the water column show internal waves and boluses propagating in the pycnocline near the upper slope. The channel and the dunes are probably the result of the interaction of the observed internal waves with the seafloor under two different conditions. The alongslope channel is located in a zone where intense barotropic tidal currents may arrest internal solitary waves, generating a hydraulic jump and focused erosion. On the other hand, upslope migrating dunes may be formed by bottom currents induced by internal solitary waves of elevation propagating landwards in the pycnocline. These small‐scale sedimentary features generated by internal waves are superimposed on large‐scale contouritic deposits, such as plastered drifts and contourite terraces, which are related to geostrophic currents. These findings provide new insights into the oceanographic processes that control sedimentation along continental margins that will help interpretation of palaeoceanographic conditions from the sedimentary record. PY 2020 PD MAY SO Earth Surface Processes And Landforms SN 0197-9337 PU Wiley VL 45 IS 6 UT 000511028800001 BP 1469 EP 1482 DI 10.1002/esp.4818 ID 71730 ER EF