Review of Stability Berm Alternatives for Environmentally Senstitive Areas, 2005

Stability berms are commonly constructed where roadway embankments cross soft or unstable ground conditions. Under certain circumstances, the construction of stability berms cause unfavorable environmental impacts, either directly or indirectly, through their effect on wetlands, endangered species habitat, stream channelization, longer culvert lengths, larger right-of-way purchases, and construction access limits. Due to an ever more restrictive regulatory environment, these impacts are problematic. The result is the loss of valuable natural resources to the public, lengthy permitting review processes for the department of transportation and permitting agencies, and the additional expenditures of time and money for all parties. The purpose of this project was to review existing stability berm alternatives for potential use in environmentally sensitive areas. The project also evaluates how stabilization technologies are made feasible, desirable, and cost-effective for transportation projects and determines which alternatives afford practical solutions for avoiding and minimizing impacts to environmentally sensitive areas. An online survey of engineers at state departments of transportation was also conducted to assess the frequency and cost effectiveness of the various stabilization technologies. Geotechnical engineers that responded to the survey overwhelmingly use geosynthetic reinforcement as a suitable and cost-effective solution for stabilizing embankments and cut slopes. Alternatively, chemical stabilization and installation of lime/cement columns is rarely a remediation measure employed by state departments of transportation.

Beach face and berm morphodynamics fronting a coastal lagoon

This study documents two different modes of berm development: (I) vertical growth at spring tides or following significant beach cut due to substantial swash overtopping, and (2) horizontal progradation at neap tides through the formation of a proto-berm located lower and further seaward of the principal berm. Concurrent high-frequency measurements of bed elevation and the associated wave runup distribution reveal the details of each of these berm growth modes. In mode I sediment is eroded from the inner surf and lower swash zone where swash interactions are prevalent. The net transport of this sediment is landward only, resulting in accretion onto the upper beach face and over the berm crest. The final outcome is a steepening of the beach face gradient, a change in the profile shape towards concave and rapid vertical and horizontal growth of the berm. In mode 2 sediment is eroded from the lower two-thirds of the active swash zone during the rising tide and is transported both landward and seaward. On the falling tide sediment is eroded from the inner surf and transported landward to backfill the zone eroded on the rising tide. The net result is relatively slow steepening of the beach face, a change of the profile shape towards convex, and horizontal progradation through the formation of a neap berm. The primary factor determining which mode of berm growth occurs is the presence or absence of swash overtopping at the time of sediment accumulation on the beach face. This depends on the current phase of the spring-neap tide cycle, the wave runup height (and indirectly offshore wave conditions) and the height of the pre-existing berm. A conceptual model for berm morphodynamics is presented, based on sediment transport shape functions measured during the two modes of berm growth. (c) 2006 Elsevier B.V. All rights reserved.

Educaci??n ambiental : cuestiones y propuestas

La presente obra recoge las ponencias y colaboraciones presentadas en el Symposium sobre Educaci??n Ambiental organizado por Cajamurcia en abril de 1995, colaboraciones que aglutinan diversos y complementarios enfoques sobre la educaci??n ambiental desde aspectos pol??tico-econ??micos hasta los propiamente did??ctico-pedag??gicos: cambio de actitudes, valores, desarrollo sostenible, cognitivismo sist??mico, participaci??n ciudadana, relaciones norte-sur, la Uni??n Europea, conservaci??n de la naturaleza, etc.

La agricultura biol??gica en la escuela

Se publica el trabajo realizado como m??todo de trabajo para las escuelas rurales asturianas. Trata de fundamentar te??ricamente y ampliar los conocimientos pr??cticos que los alumnos tienen sobre las distintas t??cnicas de explotaci??n de los cultivos de la zona. Se ofrecen los objetivos espec??ficos del proyecto, los contenido a estudiar, tipos de tierra, semilleros, t??cnicas de cultivo, influencia de la luna, elaboraci??n de men??s tomando como base los cultivos de la zona, etc. Luego se ofrecen actividades para los alumnos divididas en propuestas para cada uno de los ciclos, Inicial, Medio y Superior de EGB y otras para todos los ciclos. La metodolog??a se basa en los siguientes principios: actividad, inducci??n, globalizaci??n, creatividad, individualizaci??n, socializaci??n e inter??s. La evaluaci??n se divide en inicial mediante preguntas directas a los alumnos, continua a trav??s de observaci??n directa y final eminentemente pr??ctica, comprobando si se ponen en pr??ctica lo que se hab??a estudiado en el aula.

Ranking de 2010 en producci??n y productividad en investigaci??n de las universidades p??blicas espa??olas

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Los estudios de doctorado en Espa??a : de la Menci??n de Calidad a la Menci??n hacia la Excelencia

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Ranking de 2011 en producci??n y productividad en investigaci??n de las universidades p??blicas espa??olas

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Sexual sensation-seeking and worry about sexually transmitted diseases (STD) and human immunodeficiency virus (HIV) infection among Spanish adolescents. = B??squeda de sensaciones y preocupaci??n por las Enfermedades de Transmisi??n Sexual y VIH en adolescentes espa??oles

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Diferencias por sexo en los criterios y est??ndares de productividad cient??fica y docente en profesores funcionarios en Espa??a

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Influencia de variables sociodemogr??ficas sobre los estilos de afrontamiento, el estr??s social y la b??squeda de sensaciones sexuales en adolescentes

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Ranking de 2008 en productividad en investigaci??n de las universidades p??blicas espa??olas

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Ranking de 2009 en investigaci??n de las universidades p??blicas espa??olas

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Las Escuelas Doctorales : evoluci??n hist??rica, caracter??sticas y aspectos relevantes para su consolidaci??n en Espa??a

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Relaci??n de la productividad y eficiencia en investigaci??n con la financiaci??n de las comunidades aut??nomas espa??olas

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