Space analysis on the cachoeira ii-PE reservoir margins with vegetation indices

This study aimed to analyze the changes on the banks of the Cachoeira II reservoir, located in Serra Talhada-PE, by vegetation indices obtained with remote sensing. Two images of Landsat 5 TM and another image of Landsat 8 OLI / TIRS were used to analyze the changes. These images were used to estimate the Normalized Difference Vegetation Index (NDVI), Vegetation Adjustment Index (SAVI) and Foliar Area Index (LAI). Thereafter, a coverage types classification was performed and a statistical analysis. In addition, the monthly precipitations of the years 2000 and 2017 were obtained, which helped to interpret the changes. The reduction of the water surface area during the evaluation period caused by the drought from 2012 to 2016 was verified. Moreover, it was observed the lack of maintenance of the protected area of riparian vegetation across reservoir area, which can cause deleterious effects in the long term. The irrigated perimeter region maintained its activities over the same period, even with the droughts that affected the region during this evaluation period. Therefore, the use of remote sensing can assist in the monitoring and planning of conservation actions. Moreover, it is necessary to adopt conservation practices on the banks of the Cachoeira II reservoir so that there are no problems of contamination and silting