%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Gallay, M.
%A Martinez, Jean-Michel
%A Allo, S.
%A Mora, A.
%A Cochonneau, Gérard
%A Gardel, A.
%A Doudou, Jean-Claude
%A Sarrazin, Max
%A Chow-Toun, F.
%A Laraque, Alain
%T Impact of land degradation from mining activities on the sediment fluxes in two large rivers of French Guiana
%D 2018
%L fdi:010075627
%G ENG
%J Land Degradation and Development
%@ 1085-3278
%K land degradation ; mining ; MODIS ; runoff ; sediment yields
%K GUYANE FRANCAISE ; MARONI COURS D'EAU ; OYAPOCK COURS D'EAU
%M ISI:000465580100009
%N 12
%P 4323-4336
%R 10.1002/ldr.3150
%U https://www.documentation.ird.fr/hor/fdi:010075627
%> https://www.documentation.ird.fr/intranet/publi/2019/05/010075627.pdf
%V 29
%W Horizon (IRD)
%X We analyzed two contrasting catchments located among the world's largest unspoiled tropical rainforests impacted by mining in the northeastern coastlands of South America. We used the following: (a) mining, agricultural, and urbanized areas to compare the land use evolution with suspended sediments and sediment yields; (b) field monthly river suspended sediments in the two catchments (2004-2015: n = 154); (c) MODIS remote sensing water color technique in the Maroni basin to complete (n = 387) and extend field suspended sediment sampling from 2000 to 2015; (d) hydroclimatic statistical analysis conditions and sediment concentrations to identify the long-term trends, the abrupt changes in time series and to analyze if the environmental and anthropogenic factors control sediment yield regional variations. No significant long-term changes were observed in precipitation or water discharge with the Mann-Kendall test. However, the mean suspended sediment concentration has increased significantly (239%) in the Maroni River with a breakpoint in 2009 and decreased (33%) in the Oyapock River (breakpoint in 2008). These differences are explained by the larger percentage of deforestation because of mining activities in the Maroni (0.37%) than in the Oyapock (0.06%) catchment. In the Maroni River, the increasing sediment yield trend (2000-2015) coincide significantly (r2 = 0.97; p < 0.0001) with the increase of 400% of mining areas, whereas no significant relationship with the runoff was found. In the Oyapock River, the runoff explains the sediment yield decreasing trend (r2 = 0.82; p < 0.0001) and no relationship with the land use change was found.
%$ 038 ; 064 ; 062 ; 126 ; 021