Mapeamento de precisão da dinâmica costeira de curta duração em áreas de alta taxa de erosão no Nordeste do Brasil

Abstract

This work presented the techniques used in precision mapping of short-lived intra-annual coastal dynamics as a strategic tool for the study of intense coastal processes operating seasonally (erosion, sediment transport, sedimentary balance and supply) at a section of the Northern Coast of Rio Grande do Norte State. Therefore, the planialtimetric sampling points of Coastlines (CL) and beach surfaces collected in field (quarterly) were inserted in a georeferenced digital database, which were generated and represented the CL models and Digital Elevation Models (DEM), as well as their temporal variations. The mappings were done in the planimetric and planialtimetric components, being generated the following thematic maps: CL intra-annual maps, CL variation diagrams, maps of areas and volumes of erosion/accretion, DEM and sedimentary balance flowchart. The analysis of thematic maps allowed the identification and measurement of variations of the CL and the areas and volumes of erosion/ accretion, volume calculation and orientation of sediment transport in CL and beaches areas, in addition to the analysis of sediment balance and supply. Thus, the use of appropriate techniques for mapping enabled better understanding and analysis of short-lived seasonal coastal dynamics