Alicia M. Campo

cOMPORTAMienTO de LA VeGeTAciÓn de Un HUMedAL (MALLÍn) enTRe PeRÍOdOS HÚMedOS Y SecOS MediAnTe AnÁLiSiS HidROLÓGicO Y eSPecTRAL

En este estudio se analiza el comportamiento meteorologico y espectral de un humedal (mallin) localizado en la cuenca media del Rio Catan Lil, en la provincia de Neuquen, (Argentina), en una serie de diez anos que abarcan periodos hidrologicos secos-medios y humedos. Los mallines son importantes ecosistemas naturales que historicamente se han utilizado como recurso forrajero para la ganaderia extensiva en la Patagonia Argentina y que han sufrido, en la mayoria de los casos, intensos procesos de degradacion. . Para evaluar el comportamiento meteorologico, se caracterizaron los anos teniendo en cuenta la lluvia y la nieve caida, considerando valores totales mensuales, desde 1996/97 hasta 2005/06. El analisis espectral se realizo mediante el uso de imagenes satelitales de la serie Landsat Tm (path 232 row 087) de las series de anos mencionadas. Del analisis resulta que existe una relacion bastante directa entre anos secos o con adelantamiento de la fusion nival y la disminucion de la actividad fotosintetica de la vegetacion, respecto a periodos medios o humedos. Esto queda reflejado en los indices obtenidos mediante el proceso digital de las imagenes. La utilizacion de informacion satelital y su correlacion con informacion meteorologica es una buena herramienta para planificar el uso de estos recursos sin causar problemas que afecten la dinamica del mallin.

Urban drainage control applying rational method and geographic information technologies

The objective of this study is to develop a method of controlling urban drainages in the town of Ingeniero White motivated by the problems arising as a result of floods, water logging and the combination of southeasterly and high tides.A Rational Method was applied to control urban watersheds and used tools of Geographic Information Technology (GIT). A Geographic Information System was developed on the basis of 28 panchromatic aerial photographs of 2005. They were georeferenced with control points measured with Global Positioning Systems (basin: 6 km2). Flow rates of basins and sub-basins were calculated and it was verified that the existing open channels have a low slope with the presence of permanent water and generate stagnation of water favored by the presence of trash. It is proposed for the output of storm drains, the use of an existing channel to evacuate the flow. The solution proposed in this work is complemented by the placement of three pumping stations: one on a channel to drain rain water which will allow the drain of the excess water from the lower area where is located the Ingeniero White city and the two others that will drain the excess liquid from the port area.

Caracterización de estados de tiempo en el suroeste bonaerense, Argentina

This study analyzes weather conditions in the Southwest of the Buenos Aires Province, Argentine, considering analytical and synthetically methods complementarily. The study is centered in the city of Punta Alta where a meteorological station is located. The data information is from the year 2000. The general objective is to analyze and characterize the predominant weather conditions in the Southwest of Buenos Aires Province. Weather Charts provided by the National Meteorological Service were used. A classification of typical weather states in the area was made according to principal climatic elements: pressure, temperature and precipitations. This categorization allowed for the determining of average frequency of each type of weather.