REMOTE SENSING AND GIS BASED ANALYSIS OF GROUNDWATER DEPENDENT ECOSYSTEMS IN THE BRAZILIAN CERRADO

Código

XXIII-SBRH1118

Autores

Rafael Barbedo, Walter Collischonn

Tema

Ecohidrologia: avanços, perspectivas e desafios sobre as interações entre a água e os ecossistemas brasileiros

Resumo

Groundwater availability is one of the controls of vegetation distribution across regions with relatively long dry periods. In this study, a GIS based modelling of the terrain was made to delineate zones with high probability of hosting groundwater dependent ecosystems. The HAND algorithm was applied from the DEM in a region in the Brazilian savanna, and remote sensing analyses of the vegetation was analyzed to capture its behavior. NDVI, NDWI and energy balance ET estimation were analyzed against the HAND. It was observed that where the probability of GDE occurrence was greater, vegetation had a more heterogeneous response and larger indices of greenness, humidity, and ET rate. These groundwater sensitive zones can, therefore, have important roles in water balance components, and their inclusion in hydrologic and land surface models should be taken into account.