GEOMORPHOLOGY AND MORPHOSTRUCTURE OF THE JACUMÃ MAP, PARAÍBA STATE, NORTHEASTERN REGION OF BRAZIL

Abstract

The present work deals with the morphostructural and morphological examination of the region encompassed by Jacumã topographic chart (SB-25-Y-C-III-3-NE), located in the State of Paraíba. The techniques used in this study consisted of the elaboration and analysis of the hypsometric, the declivity, and the slopes orientation charts; as well as the analysis of the roughness and disposition of the relief, the topographic chart of Jacumã (1:25.000), previously vectored, were used for the elaboration of the above products. The results obtained from the analysis of the products showed that in the central portion of the area there is a strong structural control on the right bank tributaries of the Guruji river, where they have a marked altimetric unevenness, high steep slopes, and deep fluvial cuts and they are more numerous and enlarged than the left bank tributaries. At the end of the course of the river Guruji, there is a steep slant of approximately 90°, where its direction changes abruptly from W-E to S-N. Another anomalous point observed in the area was a large incision of the tributaries of the whatershed of Graú river, in the southern portion of the studied area, where the morphology of the relief changes abruptly from tabular to hilly and its flow is steeply slanted in its low course, changing its direction from W-E to NNW-SSE.