A relação da declividade com variáveis limnológicas em microbacias hidrográficas. Estudo de caso: município de Restinga Sêca - RS

Abstract

The development degree of a society depends mainly on the available natural resources for its development, in second level to the technology and the culture. The soil and the hydrics resources are very important natural resources for the humanity from where is extracted the sustenance of the societies, the quality and the amount of the natural resources are very relative, it depends on natural factors and the technology used for it exploration. In that way, it s very important to take in consideration the soil preservation and of the hydrics resources since they are a great indicator of the society life quality. In the last decades, we observing that the capitalist market are concerned with the amount and the quality of his products and put away linked subjects to productive systems sustainability and just worried in obtaining fast profit. Due to concern with the quality of the hydrics resources linked with the type and the way of the earth use, this work has as central objective to verify if you varied of the water bodies depend on the relief and in the ways of the earth use, appraised for remote sensing and field work from where were extracted information as: amount of sediments, electric conductivity, potential of hydrogen and temperature of the water bodies. It was observed that the areas of the hydrographic basins possess great relationship with all the limnological variables. In the hydrographic basins the potential of hydrogen is more related with the area size and the amount of forests contained in it. The total of sediments in suspension mainly depends on the size of the hydrographic basin area, but there are other factors that influence in the percentage of sediments in suspension as the largest steepness than 47% and the steepness among 12% to 47% with the presence of fields. The electric conductivity verified in the hydrographic basins studied possesses a strong relationship with the steepness classes among 12% to 47%, with the total area hydrographic basin, with fields, pastures and exposed soil.