The Bras David drainage basin (surface area: 19 km2; average annual precipitation: 8.5 m3/s) is located at the heart of the primary forest of Guadeloupe’s National Park. It is oriented toward the Atlantic so trade-winds deliver rainfall to the watershed. It is composed of relatively loose andesitic and pyroclastic soils that are about 1 Ma old and on which very thick halloysite-rich ferralitic soils have formed. The altitude of the watershed varies from 250 to 750 m.
The parameters monitored in the watershed of Bras David include:
• Precipitations and atmospheric deposits,
• River flowrate
• Concentration of materials in suspension,
• Chemical composition of the river: pH, conductivity, dissolved major elements, dissolved and particulate organic carbon,
• Chemical composition of solutions in saprolite.
English page translated by M2 ILTS, Université Paris Diderot and Systran