Análise morfotectônica e morfoestrutural no controle de erosões hídricas lineares na região de Marília (SP)

• Ano de defesa: 2014
• Autor(a) principal: Morinaga, Márcia Sayuri [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Erosion; Erosão; Solos - Deformação; Geologia estrutural; Geomorfologia; Marilia (SP)
• Link de acesso: http://hdl.handle.net/11449/113982

The west of the state of São Paulo is known by its strong agricultural vocation and by the erosion problems. The natural conditions and the occupation dynamic were propitious to the emergence of this kind of environmental degradation in the soil, resulting in loss of usable area, siltation of water bodies and demands on infrastructure. Linear hydraulic erosion, such as ravines and gullies, have as forming factors the climate, soil, land slope and the use. Many authors relate the rock structural conditions as one of the conditions of the emergence and development of this kind of erosion. To enlarge the knowledge about this subject, the present work aimed an analysis of the brittle and ductile geologic deformations and its relations to the accelerated linear hydraulic erosion in the region of Marília (SP), through the interpretation of remote sensing images. The study area comprises the latitudes 22°00’S and 22°15’S and the longitudes 49°45’W and 50°15’W and has one of its main characteristics the presence of the Marília Plateau, a plateau with festooned slopes which stands out in the landscape, composed by the carbonate sandstone from the Marília Formation (Bauru Group). Structural lineaments, joint traces and structural highs and lows where, therefore, mapped. The two first linear features were analyzed in relation to its frequencies and directions; whereas the dome and depressive structures were related to its topographic positioning. To enlarge the knowledge of the study area, it was performed physiographic analysis and of weathering alteration covers by satellite image interpretation, field works and bibliographic queries. Finally, these information were related to the development of the linear erosions, features that were identified from aerial photographs and proved in field. Among the results, it was observed that the structure frequencies of brittle deformation did not present correlation with the development of the...