Abstract

TABAJARA, Luiz L. C. A. et al. Classification criterion sand management of a wave-dominated sandy coast with intensive urban occupation: the Imbé Case, RS, Brazil. RGCI [online]. 2013, vol.13, n.4, pp.409-431. ISSN 1646-8872.  https://doi.org/10.5894/rgci381.

The north coast of the state of Rio Grande do Sul (Brazil) has been suffering a continuing process of human occupation in the last decades due to the expansion of tourism and second-residences.The need of the municipality of Imbé (Rio Grande do Sul - RS) to elaborate the Plan of Dune Management led to the construction of a method for managing coastal assessment to priority sectors. The diagnosis is a first step to the planning of the whole coast of the municipality, which uses criteria of environmental analysis and human occupation, seeking the division into sectors. The identification of conflicts between urbanization and beach facilitates the choice of management techniques and control the different use of space, in order to solve the problems of erosion and the littoral degradation. Between december 2011 and march 2012 classical techniques of beach morphodynamic, morphology and ecology of the dunes were applied in the research area. Also, they were complemented with an data matrix elaborated from environmental and urbanization patterns (checklist) for setting rates vulnerabilities (IV%). Four sectors with similar characteristics were identified to facilitating the application of management techniques in a large spacial scale: South sector (a) - urbanized coast without dunes; South sector (b) - erosional coast due wave and washouts; Central sector - progradational and stable coast; North sector - gradual erosional coast. At the north of beach, the risk of erosion and degradation of foredunes grew up due to the expansion of urban and the construction of the road on APP (Area of Permanently Protection) dunes. Coincidently decreased the subaerial beaches and losses of stock sediment into the transgressive dunefield of Imara. As suggestions to control the erosion problem, the Plan of Dune Management of the Imbé beach proposes: Installing sand fences, scattering the dead vegetation, constructing foredunes and vegetation plantings, resizing the washouts, improving the beach access and signalizations in addition to environmental education.

Keywords : Foredunes Vulnerability; Morpho-Ecological Profiles; Dune Management.

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