FN Archimer Export Format
PT J
TI Simulating sediment supply from the Congo watershed over the last 155 ka
BT 
AF MOLLIEX, Stephane
   KETTNER, Albert J.
   LAURENT, Dimitri
   DROZ, Laurence
   MARSSET, Tania
   LARAQUE, Alain
   RABINEAU, Marina
   N'KAYA, Guy D. Moukandi
AS 1:1;2:2;3:3;4:6;5:3;6:4;7:6;8:5;
FF 1:;2:;3:PDG-REM-GM-LGS;4:;5:PDG-REM-GM-LGS;6:;7:;8:;
C1 Univ Bretagne Occidentale, CNRS, IUEM, Lab Geosci Ocean,Labex Mer,UMR 6538, F-29280 Plouzane, France.
   Univ Colorado, Inst Arctic & Alpine Res, CSDMS, Dartmouth Flood Observ, Boulder, CO 80309 USA.
   IFREMER, UR Geosci Marines, BP 70, F-29280 Plouzane, France.
   OMP, F-31400 Toulouse, France.
   Univ Marien Ngouabi, LMEI CUSI ENSP, BP 69, Brazzaville, Rep Congo.
C2 UBO, FRANCE
   UNIV COLORADO, USA
   IFREMER, FRANCE
   OBSERV MIDI PYRENEES, FRANCE
   UNIV MARIEN NGOUABI, REP CONGO
   CNRS, FRANCE
SI BREST
SE PDG-REM-GM-LGS
UM LGO
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 3.803
TC 9
UR https://archimer.ifremer.fr/doc/00467/57897/95009.pdf
LA English
DT Article
CR GUINESS 2
   GUINESS I
   REPREZAI_LEG2
   ZAIANGO1
   ZAIANGO2
BO Le Suroît
   L'Atalante
DE ;Glacial/interglacial;Sediment supply modeling;HydroTrend;Vegetation dynamics;Equatorial Africa;Congo watershed;Weathering;Hydrology
AB The Congo River is the world's second largest river in terms of drainage area and water discharge. Monitored for decades, a large dataset is available, onshore for both the hydrology and sediment load, and offshore by many paleo-environmental proxies compiled at the Late-Quaternary time-scale. These numerous data allow for accurate calibration of numerical modeling. In this study, we aim to numerically quantify the evolution of sediment supply leaving the tropical Congo watershed during the last 155 ka and to decipher the forcing parameters that control this sediment supply over glacial/interglacial stages. For this, a modified version of the model HydroTrend, that besides morphologic, climatic, hydrologic, lithologic, land cover and anthropogenic factors now also considers sediment deposition on the floodplain, is used. In addition, a method to quantify the impact of natural vegetation changes is developed. Simulations match well the present-day observed data. They indicate that a significant portion of suspended sediments is trapped on the floodplain. Long-term simulations indicate that environmental changes between glacial and interglacial stages account for a 30% maximum variation of sediment supply. Climatic changes - precipitation and temperature, account for a maximum decrease in sediment supply of 20% during cold periods while conversely, induced land cover changes (loss of forest during colder and dryer stages) lead to enhanced sediment supply up to 30%. Over a longer period, the average sediment supply remained almost constant during glacial and interglacial periods, while peaks may have occurred during a warming period, just before forests had time to recover the catchment, i.e. during post-glacial periods. These moderate changes in sediment export, despite major changes in climate and vegetation cover, can be explained by the efficiency of sediment trapping of large tropical catchments that buffer fluvial fluxes towards the ocean. 
PY 2019
PD JAN
SO Quaternary Science Reviews
SN 0277-3791
PU Pergamon-elsevier Science Ltd
VL 203
UT 000454965400003
BP 38
EP 55
DI 10.1016/j.quascirev.2018.11.001
ID 57897
ER

EF