Ana Lúcia Denardin da Rosa

Superfície potenciométrica e possíveis fontes de contaminação do aquífero parecis no município de Vilhena - RO,BR

The control and preservation of groundwater quality are the main tasks to be performed during environmental planning of this resource. Thus, the present study aims to determine the lines of groundwater flow in the municipality of Vilhena, Amazon Region. This town gets its water supply from the Parecis Aquifer. Potencial sources of contamination were identified including gas stations, municipal cemetery, contaminated supply wells and inactive dumps. Through the potentiometric surface map was determined a vulnerability of the well number 27 which is the responsibility of the Autonomous Service for Water and Sewage, which is located in an area of ​​convergence of flows, and thus can receive contaminant loads coming from the municipal cemetery and two inactive dumps. Thus, the study of the potentiometric surface of the Parecis Aquifer is a valuable tool for spatialization of Geographical Information System that allows, by observing the generated map, locate the best spots for installation of new supply wells, gas stations, providing subsidies for management process, land use and control the exploitation of groundwater at the municipal level.

Influência do Uso e Ocupação do Solo no Escoamento Superficial na Cidade de Ji-Paraná-RO, Amazônia Ocidental (Influence of Land Use and Occupation in Runoff in the City of Ji-Paraná-RO, Western Amazon)

No municipio de Ji-Parana/RO, a ocupacao urbana ocorreu de forma desordenada as margens dos rios Urupa e Machado, tornando parte da area urbana suscetivel a inundacoes. O presente estudo teve como objetivo a caracterizacao do uso recente do solo em seis bacias hidrograficas que integram o perimetro urbano de Ji-Parana, a partir da utilizacao do processamento digital de imagens (PDI), sendo verificado que todas elas possuem mais de 20% de sua area impermeabilizada. Tambem foi verificada a influencia da urbanizacao das bacias no escoamento superficial, com base nos dados provenientes da analise de chuvas intensas, sendo mensurado o tempo de concentracao (tc) pelo metodo de George Ribeiro, Kirpich e Kirpich Modificado; o coeficiente de escoamento superficial (C) pelos metodos de Horner e Fantoli; e as vazoes maximas de projeto (Q) pelo metodo racional; cujos resultados nao diferiram estatisticamente. A B S T R A C T Urban occupation in the city of Ji-Parana/RO occurred on the banks of Urupa river and Machado river in a disorderly manner, making part of the urban area susceptible to floods. This study aimed to characterize the current land use in six watersheds that comprise the urban perimeter of Ji-Parana using the digital image processing (DIP). It was found that all of them have more than 20% of its area impermeable. The influence of urbanization of watersheds in the runoff was observed based on data from the analysis of heavy rainfalls, and the time of concentration (tc) was measured by the method of George Ribeiro, Kirpich and Kirpich Modified; the runoff coefficient (C) by the methods of Horner and Fantoli; and the project peak flows (Q) by the rational method; the results were not statistically different. Keywords: Watershed, Digital Image Processing, Heavy rainfall, Concentration Time, Peak Flow.