NDLI: Proposal of a geo-environmental zoning method based on Ottobasin compartmentalization

Content Provider	Springer Nature Link
Author	Fontes, Silvana Brandão Pejon, Osni José
Copyright Year	2008
Abstract	This paper proposes a new geo-environmental zoning method based on the hydrographic basin compartmentalization and codification technique known as the Ottobasin Method [Pfafstetter in Classificação de Bacias Hidrográficas—Metodologia de Codificação Rio de Janeiro, RJ. Departamento Nacional de Obras de Saneamento (DNOS), p 19, 1989]. A study was carried out in the Pardo River Basin, São Paulo, Brazil. Ottobasins were characterized based on the rock substratum, unconsolidated materials, slope, drainage and landform. The percentage of each analyzed attribute was calculated and compared between the Ottobasins. A GIS-aided analysis was used to assess which Ottobasin should be subjected to further compartmentalization such that an acceptable level of homogeneity was reached. When an adequate level of compartmentalization is attained, the units are sufficiently homogeneous to allow for their use as geo-environmental units, ie as a tool for planning environmental protection/mitigation.L’article propose une nouvelle méthode de zonage géo-environnemental fondé sur la partition d’un bassin hydrographique et une technique de codification connue comme la méthode Ottobasin (Pfafstetter in Classificação de Bacias Hidrográficas—Metodologia de Codificação Rio de Janeiro, RJ. Departamento Nacional de Obras de Saneamento (DNOS), p 19, 1989). Une étude a été réalisée sur le bassin de la rivière Pardo (São Paulo, Brésil). Les unités définies sont caractérisées à partir de la nature du substratum, des formations superficielles, de la pente du terrain, des conditions de drainage et des caractéristiques géomorphologiques. Une quantification de ces paramètres est établie et des comparaisons entre les différentes unités identifiées sont réalisées. Une analyse basée sur un SIG est conduite pour identifier les unités qui doivent faire l’objet d’une nouvelle partition, afin d’atteindre un niveau comparable d’homogénéité entre les différentes unités résultantes. Lorsque cet objectif est atteint, les unités sont suffisamment homogènes pour pouvoir être considérées comme unités géo-environnementales, alors utilisables pour gérer les questions de planification environnementale et de définition des actions acceptables pour l’environnement.
Starting Page	555
Ending Page	563
Page Count	9
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	67
Issue Number	4
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-07-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zonage géo-environnemental Partition environnementale Méthode Ottobasin Cartographie géotechnique Nature Conservation Geoecology/Natural Processes Structural Foundations, Hydraulic Engineering Applied Geosciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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