JE5 : EROSAT – ERosion from geOchemistry and remote Sensing of lAndslides in the Tropics
As a major agent of erosion and sediment supply to rivers, mass wasting are one of the most efficient physical processes shaping the Earth’s surface and is thus critical to landscape evolution. They promote the percolation of surface runoff in highly fragmented rock debris thereby creating favorable conditions for chemical weathering that is a major atmospheric carbon dioxide sink. EROSAT project aims to evaluate the role of slope instability in sediment and solute fluxes from watersheds, and to study their impact on the critical zone in tropical islands of Guadeloupe, where erosion and weathering rates are among the highest on Earth. By a combining an innovative multidisciplinary approach based on ObsEra data, geochemical analysis and multi-scale remote-sensing, EROSAT will lead to an analytical scaling between mass wasting and sediment/solute load in the river. Ultimately, EROSAT will deliver a quantitative modeling of the sediment and solute transport driven by mass wasting.