Avaliação dos processos sedimentológicos na bacia do rio Jacarecica, em Maceió-AL

Abstract

Over the years with the change of use and land cover Jacarecica River Basin located in Maceió in Alagoas state, has gone through several transformations significantly increasing its urbanized area, mainly in the upper and middle basin. The accelerated erosion caused by increased urbanization and the effects of climate variability are the main causes of increased sediment production in many river basins in Brazil. The growing urban sprawl in recent decades in the city of Maceió has several benefits for the economic sector, generating employment and income. However, with the advancement of disorderly urbanization occur numerous problems related to increased sediment production in local and regional scales due mainly to soil sealing. Aiming to analyze the seasonal sediment yield in spatiotemporal scale, Field campaigns were conducted during the dry and rainy from June to December 2010 for the measurement of parameters of hydrosedimentological Jacarecica River Basin. The results obtained in the field will serve as a comparison and calibration of data obtained from the sedimentological model rainfall-runoff-erosion KINEROS2 coupled to a GIS data used for simulating runoff and sediment yield. The results show that the months with precipitation above the climatological average (January, February and June) had higher values of sediment yield at the outlet of the basin, in the order of about 6.57, 1.34 and 120 t ha-¹ months -1 respectively. Land use also directly influenced the production of sediments in the basin, since the model responded well to the variation in coverage of the basin and urbanized areas with exposed soils had their plans with the highest sediment yield, while areas with higher vegetation cover produced less sediment throughout the year 2010.