25 research outputs found

    Criterios ambientales para la selecci贸n de un Sistema de Informaci贸n Geogr谩fica en la evaluaci贸n de impacto ambiental de infraestructuras lineales

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    Geographic Information Systems can be consider as one of the most powerful tools for the Environmental Impact Assessment in the long distance railways and highways infrastructures. The evaluation process begin with the analysis of the activity and the physical and ecological geography. One of the most common bottlenecks is the use of environmental criteria for the discrimination of different evaluation proposals. A methodotogical approach is presented with seven diverse environmental criteria involved. The use of this multilevel methodology can help to physical planner sand decision makers in the selection of the best environmental proposal.Los Sistemas de Informaci贸n Geogr谩fica (SIG) son una herramienta muy poderosa para la evaluaci贸n de los impactos ambientales de grandes infraestructuras lineales. El proceso de evaluaci贸n comienza con el an谩lisis de la actividad y de los factores f铆sicos y ecol贸gicos del medio. En la mayor铆a de los m茅todos, la selecci贸n de los criterios ambientales usados para la discriminaci贸n de alternativas se convierte en el cuello de botella del proceso de evaluaci贸n. En este art铆culo se presenta una metodolog铆a de trabajo en la que se proponen varios criterios medioambientales para la selecci贸n de alternativas de trazado de infraestructuras lineales. El uso de esta metodolog铆a multinivel puede ayudar a los profesionales involucrados en la planificaci贸n del medio f铆sico en la toma de decisiones para la selecci贸n de la mejor alternativa de trazado de infraestructuras lineales

    Impacto ambiental del proyecto de regeneraci贸n de la playa de Denia, Alicante (Espa帽a)

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    This paper show the main results of the Environmental Impact Assessment of the coastal regeneration project in Denia (Alicante).Two alternatives were evaluated. The first one implies the deposit of 3.8 millions m3 of sand along the shoreline. Meanwhile the second one involves the construction of three new docks and also the contribution of 0.9 millions of m3 of sands. All environmental features were evaluated in the sand marine deposit and in Denia shoreline. The second option, new docks plus sand contribution, appears to be more adequate from the environmental point of view.Se presentan los resultados del estudio de impacto Ambientaldel proyecto de regeneraci贸n de costas de las playas de la Almadraba les Deveses en el t茅rmino municipal de Denia, Alicante.Se contemplan dos alternativas de actuaci贸n. La primera supone la regeneraci贸n mediante el vertido de arena a la playa y la segunda combinan el vertido de arenas con la construcci贸n de espigones. Se analizan las principales variables ambientales tanto de las zonas de extracci贸n de arenas como de la playa receptora y se procede a la evaluaci贸n ambiental de las alternativas. La segunda opci贸n (construcci贸n de espigones y vertido de arenas) se revela como la m谩s adecuada desde el punto de vista ambiental

    Oferta y valor nutritivo de alimentos y productos alimenticios para vegetarianos en diet茅ticas de Salta capital

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    Los Objetivos del presente trabajo fueron:Identificar alimentos y productos para vegetarianos que se expenden en la Ciudad de Salta. Valorar el rotulado nutricional. Analizar el valor nutritivo de dichos productos

    Effects on run-off water quantity and quality of urban organic wastes applied in a degraded semi-arid ecosystem

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    Biosolids and composted municipal solid wastes were surface-applied (0 and 80 Mg ha-1) to a degraded soil in a semi-arid environment to determine their effects on the quantity and quality of run-off water. Three and 4 years after application, a simulated rainfall was performed (intensity=942.5 ml min-1 and kinetic energy=3.92 J m-2) on 0.078 m2 plots using a portable rainfall simulator. The run-off from the different treatment plots was collected and analysed. The type of treatment was highly related to infiltration, run-off and sediment production. The biosolid-treated plots showed the minimum value of total run-off, maximum time to the beginning of run-off and maximum run-off ratio (the relationship between total rainfall and run-off). The MSW-treated plots showed values intermediate between biosolid-treated plots and control plots. Soil losses were also closely related to treatment type. Control plots showed the maximum sediment yield, MSW-treated plots showed intermediate values, and biosolid plots the minimum values for washout. The concentrations of NH4-N and PO4-P in the run-off water were significantly higher in the treated plots than in control plots. The highest PO4-P value, 0.73 mg l-1, was obtained in the soil treated with biosolids; NO3-N concentration also increased significantly with respect to the control and MSW treatments. NH4-N concentrations of 15.6 and 15.0 mg l-1 were recorded in the soils treated with biosolids and MSW, respectively, values approximately five times higher than those obtained in run-off water from untreated soil. However, the concentrations of all these constituents were lower than threshold limits cited in water quality standards for agricultural use. With the exception of Cu, all trace metals analysed in the run-off water were below detection limits. 漏 2002 Elsevier Science B.V. All rights reserved

    A Neural Approach to Extended Logic Programs

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    A neural net based development of multi-adjoint logic programming is presented. Transformation rules carry programs into neural networks, where truth-values of rules relate to output of neurons, truth-values of facts represent input, and network functions are determined by a set of general operators; the output of the net being the values of propositional variables under its minimal model. Some experimental results are reported

    La evaluaci贸n de impacto ambiental en Europa

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    La evaluaci贸n de impacto ambiental constituye, en la actualidad, uno de los instrumentos m谩s eficaces de protecci贸n de la naturaleza. En esencia se trata de un trabajo t茅cnico (el Estudio de Impacto Ambiental) que mediante un procedimiento administrativo da lugar a una resoluci贸n vinculante (Declaraci贸n de Impacto Ambiental) para el promotor de la actividad a evaluar. Todo este mecanismo se articula como una ayuda para la toma de decisiones, por pacte del responsable de la administraci贸n, sobre las repercusiones ambientales de determinados proyectos en el medio que las acoge. Este instrumento se encuentra regulado por diferentes disposiciones legislativas de la Uni贸n Europea; que posteriormente son traspuestas a la normativa jur铆dica de cada Estado miembro. En este art铆culo, se realiza un an谩lisis cr铆tico sobre las diferentes disposiciones comunitarias, desde su origen en 1985 hasta la actualidad y su trasposici贸n a la normativa jur铆dica estatal
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