Maria da Graça Barros Sartori

CONSIDERAÇÕES SOBRE A VENTILAÇÃO NAS CIDADES E SUA IMPORTÂNCIA NO PLANEJAMENTO URBANO

Aeration in towns influences the urban climate. It is connected to geoecological and geourban factors which change the resulting air movement of Regional Circulation. In the aeration of cities at local and urban levels, modifying elements connect to topography and the ones resulting from urbanization, are important. Cities, due to their structure, surface characteristics and heat islands, exert rnechanical and thermal influences in the airstream, generating a specific circulation which is proportional do its size. Studies undertaken in the city of Santa Maria-RS stress the site influence and urban structure an air movement. The knowledge of such self-circulation is an important factor to be taken into account in urban planning decisions.

A CIRCULAÇÃO ATMOSFÉRICA REGIONAL E OS PRINCIPAIS TIPOS DE SUCESSÃO DO TEMPO NO INVERNO DO RIO GRANDE DO SUL, BRASIL

RESUMO o mecanismo de atuação dos sistemas atmosféricos extratropicais e intenropicais no Rio Grande do Sul, Brasil, durante o inverno, reflete as condições de abastecimento de ar polar nas latitudes subantárticas, o equilíbrio de forças entre os centros de ação, a eficiência das frontogêneses e as trajetórias das frentes polares. Desses fatores de natureza dinâmica, surgem combinações de tipos de tempo que podem ser agrupadas em três modelos de sucessão típicas do inverno sul-riograndense, obtidos através da técnica de analise rítmica e da interpretação de cartas sinóticas e de imagens de satélite meteorológico.

UM BRASIL DE MONTANHAS

The new classification of the Brazilian relief into three macrocompartments,which is presented by ROSS (1996) and adopted by everyElementary School and Vestibular Preparatory Geography textbook authors ofSanta Maria, led scholars of the named course to mistaken affirmations oncethese textbooks claimed that there are not mountains in Brazil. This work waselaborated with the objective of clarifying, once and for all, the controversythat such claim has brought up, giving conceptual explanation, which wasbuilt on literature revision of national and international renownedgeomorphologists, which reinforced the arguments of the authors. That way,the literature revision together with the geological and geomorphologicalanalysis make it possible to affirm that there are mountains of several originsand altitudes in Brazil.