The goal of this work is to show the main aspects of regressive erosion in the hydrographic basin that supplies the dam public Namorado, in S?o Jo?o do Cariri-PB. This article deals with the dynamic between morfogenesis and pedogenesis from the existing interaction between morfogenetics powers and the landscape. Therefore, the erosion becomes a quantifiable indicator, because in a hydrographic basin it is clearly indicated the lose of material caused by the mechanic of pluvial and fluvial processes. Based on the digital model of elevation, and on the geoprocessing of landscape data, it became clear that there is regressive erosion in the canals resulting from the high intensity rainfalls and the lack of vegetation coverage. Canals in areas with vegetation coverage show intense receding with intensification in some specific seasons because of rainfall, that shows the vulnerability of semi-arid environment. It is concluded that the periods of relative stability do not supply the system with pedogenesis enough to maintain the balance between erosion and soil formation.
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机译：这项工作的目的是显示在S？o Jo？o do Cariri-PB中为大坝Namorado大坝供水的水文盆地的回归侵蚀的主要方面。本文从形态发生力与景观之间的现有相互作用出发，探讨了成岩作用与成岩作用之间的动态关系。因此，侵蚀成为可量化的指标，因为在水文盆地中，清楚地表明了由冲积和河流冲刷过程引起的物质损失。基于数字高程模型和景观数据的地理处理，很明显，由于高强度降雨和缺乏植被覆盖，导致了运河中的回归侵蚀。由于降雨，在某些特定季节，植被覆盖地区的运河表现出强烈的后退和加剧的趋势，这表明半干旱环境的脆弱性。结论是，相对稳定的时期不能为系统提供足够的成岩作用以维持侵蚀和土壤形成之间的平衡。
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