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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An?lise dos fatores respons?veis pela alta salinidade do aq??fero fissural da microbacia do Riacho do Feij?o - Pedro Avelino/RN

Medeiros, Jailsa da Silva 19 May 2006 (has links)
Made available in DSpace on 2014-12-17T15:19:59Z (GMT). No. of bitstreams: 1 JailsaSM.pdf: 722262 bytes, checksum: b5daa60e103a373c84c164786328442f (MD5) Previous issue date: 2006-05-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The fissures aquifer northeast semi-arid Brazilian, present high text frequently of leave, with of low a h?dric availability. The research has as objective main to analyze the components that inside influence in the salinity of the waterbearing fissures of an evaluation physicist-chemistry of the water, leading in consideration the physical interventions of the environment. One used techniques of interpretation of image of Landsat satellite -1999 and delimitation of the micro basin through the topographical map SUDENE. One identified waters of the NaCl type with Ca++ and Mg++ in secondary concentrations. The analyzed wells (15), had presented an average salinity of 5.147 mg/L of STD and a well only supplies drinking waters with 319 mg/L of STD. The recharge of the aquifer one if carries through for infiltration in the open fracture of ortognaisse it migmatization. The type and directions of the fracture do not control the STD. Relations between salinity and out let do not exist. The quality of the well of low salinity is identical the superficial waters (aquifer dam and alluvial). The studies of the meteoric erosion processes had evidenced that in the transformations of the rock in ground, the Ca++ and Na+ are taken for superficial waters. The treatment of the data chemical showed that the grade of Na+, Ca++, Mg++ and Cl-are controlled for the evaporation process, from only water that would have the qualities of superficial waters or the well of low salinity. Already the HCO3-grade is controlled for the precipitation of the dolomite. The STD of this aquifer one would be consequence of the high tax of evaporation of dams constructed in regions of plain topography. You leave them precipitated in deep argillaceous ones dry dams are led for the aquifer in first rains. The research suggests some recommendations for the use and exploitation of the water salinity in piscicultura, carcinicultura, culture of the grass-salt (Atriplex sp), among others / Os aq??feros fissurais do Nordeste semi-?rido Brasileiro, apresentam freq?entemente elevado teor de sais, al?m de uma baixa disponibilidade h?drica. A pesquisa tem como objetivo principal analisar os componentes que influenciam na salinidade dos aq??feros fissurais dentro de uma avalia??o f?sico-qu?mico da ?gua, levando em considera??o as interven??es f?sicas do ambiente. Utilizou-se t?cnicas de interpreta??o de imagem de sat?lite Landsat -1999 e delimita??o da microbacia atrav?s da carta topogr?fica de Lajes SUDENE. Identificou-se ?guas do tipo NaCl com Ca++ e Mg++ em concentra??es secund?rias. Os po?os analisados (15), apresentaram uma salinidade m?dia de 5.062 mg/L de STD e somente um po?o fornece ?gua pot?vel com 319 mg/L de STD. A recarga do aq??fero se realiza pela infiltra??o nas fraturas abertas do ortognaisse migmatizado. O tipo e dire??es das fraturas n?o controlam a concentra??o de STD. N?o existe rela??o entre STD e vaz?o. A qualidade do po?o de baixa salinidade ? id?ntica as ?guas superficiais (a?ude e aq??fero aluvionar). Os estudos dos processos de intemperismo evidenciaram que nas transforma??es da rocha em solo, o Ca++ e Na+ s?o levados para as ?guas superficiais. O tratamento dos dados qu?mico mostrou que os teores de Na+, Ca++, Mg++ e Cl-s?o controlados pelo processo de evapora??o, a partir de uma ?gua ?nica que teria as qualidades das ?guas superficiais ou do po?o de baixa salinidade. J? os teores de HCO3 s?o controlados pela precipita??o da dolomita. A salinidade deste aq??fero seria conseq??ncia da alta taxa de evapora??o dos a?udes constru?dos em regi?es de topografia plana. Os sais precipitados nos fundos argilosos dos a?udes secos s?o levados para o aq??fero nas primeiras chuvas. A pesquisa sugere algumas recomenda??es para a utiliza??o e aproveitamento da ?gua salinizada em piscicultura, carcinicultura, cultivo da erva-sal (Atriplex sp), entre outras

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