Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The objective was to evaluate the quality of water from basin collector streams in the geographicaldepartments of Federal, Federación, Feliciano and Diamante related to dams for crop irrigation under thehydrological situation of low water. Twelve stream environments were sampled including an inventory ofplant life. Water samples were taken for chemical-physical analysis and for carrying out two bioassays:Allium test and Lactuca sativa seed germination. Root length and germination index, variables recorded inboth bioassays, were analyzed using Dunnet’s test. Streams from Central North of the Entre Rios Provincepresented low sodium adsorption relation (RAS) values (<10) and electric conductivity (EC) lower than 750μS cm-1. In those streams from Diamante Department, EC ranged from 910 to 1170 μS cm-1. The Allium testas well as the toxicity bioassay of Lactuca sativa seed germination were negative. Chemical-physicalanalysis and bioassays indicated aptitude for irrigation and no toxicity in waters from Central North EntreRíos, while those from Diamante department streams though not presenting toxicity, they would not be aptfor crop irrigation during low water season due to high EC.

A synthesis of the development and implementation of the SIMHUNER and ARHIUNER simulation modelsis presented. The SIMHUNER is capable of mathematically simulating the catchment response and extendingflow series from daily rainfall and evaporation series. The model is based on a conceptual scheme that represents basin storage using three reservoirs. Mass transfer among reservoirs and into the atmosphere as well as the generation of different runoffs are regulated by functions and algorithms whose parameters are determined by the Rosenbrock optimization algorithm with restrictions. ARHIUNER allows the simulation ofreservoir operation. This requires observed or calculated flow series to obtain the relationship between reservoir capacity, irrigation demand and risk. Both models are complementary for a rational and sustainablewater resources planning in irrigated areas. The application of the models to the upper basin of theGualeguaychú river has permitted the validation of the model. It also showed the importance of long flowseries for the correct evaluation of risk in irrigated areas.

The natural grasslands are biomas that contribute to the biophysical sustainability of a territory. They possess the capacity to assist the demand of environmental wealths and services for satisfaction of basic necessities of the society. The expansion of the agriculture in the pampean region in the last three decades, it has replaced them mainly for the cultivation of soybean. In this work indicators were applied that valued the biophysical sustainability in the territory of two rural basins, as consequence of the decrease of the covering of the natural grasslands in the period 1976-2005. The applied indicators were good estimadores of the biophysical sustainability in the two plain basins. The substitution of the natural grasslands for the agricultural activity, it has increased the threat on the local sustainability, for the decrease of the offer of environmental services and the exposition to the risk of the natural ecosystems even present in the territory.

The fluvial morphology is conditioned by the litological variety of the Paleozoic bedrock, by the AndineTectonic influence and by the Quaternary evolution of the area. The fluvial network, with a 5 order, fits to thetheoretical Horton principles. The geometrical parameters suggest a quick rainfall response, the low value ofthe drainaje density is according to the physical basin features. Thus observed parameters may be found inother fluvial system of Sierra Pampeana, Cordoba.

The goal of this paper is to present, through an example, the potential use of MS Excel for carrying outprobabilistic water-related health risk analyses. It is applied to a case of accidental intake of sub-chronic orchronic pf water, due to recreational use of natural waters, using the nitrate content as the species dangerous for health. The paper describes complex nested functions in Excel, used to apply Monte Carlo in order to obtain the frequency distributions of the parameters related to the exposition as well as the risk. Results show that those complex functions are a good substitute of numerical operations done with commercial software explicitly designed for risk analyses. Without resignation of calculation precision, the lack of options and the graphical/analytical abilities of Excel are compensated by its ubiquity and low cost. That makes it a feasible option to decision makers at the municipal water resources management level for carrying out probabilistic health risk analyses, given the fact that the limited amount of funds does not allowpurchasing high-price software. 

The agricultural land use and the degree of vegetal cover are important parameters to consider the potentiality of runoff and erosion in a basin and, in addition, to evaluate the development of crops, production, etc. In this work the variation of the land use and the vegetal cover throughout a year (April of 2005 until March of 2006) in a cattle agricultural river basin of the center of the Buenos Aires province, Argentina, is evaluated. This annual cycle, while modifications of productive structure of the zone do not take place, can be valid for many years. In order to obtain the desired objective, techniques of digital processing of satellite images and GIS are used. Thus the land use is determined by means of nonsupervised classification of the images. Then, to each use a percentage of cover is assigned according to field measurements and to the phenologic state, in the case of crops. 12 land use categories throughout the year are obtained, to which lagoons, rock outcrops and forest are added. The results show minor degrees of cover in winter, with a minimum of 66 % in September, and then grow until to reach a maximum of 92 % in February and March, in the apogee of the cultures of soybean and maize.

As a part of the activities of the Study “Provision of the Hydrometheorologic network and Flow Forescasting System of Yaciretá”, this paper presents the analysis of precipitation stations in the zone of influence. Of a19 stations with available data, 4 only possess a longitude of approximately 65 years of data: they are the stations Cerro Azul, Encarnación, Villarrica y Montecarlo. On the other hand, a group of stations with a longitude of approximately 30 years series and the 10 years the rest. The analysis from the precipitations to annual level and monthly level their realized. For the calculation of the precipitations monthly the stations were grouped in North Zone, Central Zone and South Zone. Analyzing the seasonal variation from the precipitations to annual and monthly level you concludes that the stations possess a homogeneous hydrological regimen since so much the annual cycles as the precipitate magnitude they are similar. 

En los últimos tiempos el tema de los archivos ha cobrado creciente importancia. Seguramente esta mayor visibilidad de una problemática hasta hace poco casi  totalmente ignorada por las políticas públicas se relaciona con el llamado auge de memorias y con el lugar relevante adquirido por el pasado reciente. La relación entre pasado reciente y archivo es sumamente estrecha, en tanto este último constituye una pieza clave tanto para la reconstrucción de lo sucedido y la parcial  reparación del daño, como para fundar las condiciones de posibilidad de los procesos judiciales a los responsables del terrorismo de Estado. Sin embargo, no parece que la “cuestión archivos” sea solamente motorizada por los requerimientos del pasado reciente, sino que ese inicial impulso ha derivado en un abordaje más general de la problemática. Quizás por ello la revista La Biblioteca, órgano oficial de la Biblioteca Nacional, haya decidido dedicar su primer número de esta nueva época al tema de los archivos: “El archivo como enigma de la historia” es el título de un número enteramente dedicado a la temática y sus cuestiones anejas, en el que colaboran destacados intelectuales como Oscar Terán, Horacio Tarcus, Nicolás Casullo, Eduardo Grüner, Patrice Vermeren, Susana Romanos y Horacio González, entre muchos otros. Y es que la nueva visibilidad del archivo precisa ser acompañada de debates y reflexiones que partan del reconocimiento de la crítica situación de la que se parte hoy día. Desde Políticas de la memoria, tal como lo hicimos en números anteriores, queremos continuar aportando a este necesario debate. Por ello el  presente dossier “En torno al archivo” reúne tres intervenciones que indagan la problemática desde distintos ángulos.

El artículo se propone reflexionar sobre el interés de los archivos particulares en una doble vertiente: como fuentes históricas y como documentos sujetos a prácticas y políticas archivísticas específicas. A partir de la experiencia del CeDInCI con la recuperación y catalogación de archivos particulares de dirigentes, militantes y escritores de las izquierdas argentinas, se señalan las dificultades referidas a la patrimonialización y accesibilidad de los documentos de archivo de las izquierdas, así como se sugieren algunas líneas de investigación y se describen los fondos actualmente accesibles en el CeDInCI.

El dilema de la política acerca del sujeto universal de la revolución y del cambio social se mantiene en la forma de una pregunta nunca resuelta satisfactoriamente porlas diversas organizaciones y expresiones de la izquierda vernácula: ¿liberación de las mujeres y los hombres o liberación de la “humanidad”? Este interrogante no es nuevo ni responde solamente a la complejización de la categoría “sujeto” propia de las filosofías más actuales; fue planteado por algunas mujeres al interior del anarquismo local de fines del siglo XIX. Respondiendo a la convocatoria masculina comprometida con la emancipación de la mujer, las anarquistas sostienen un  diálogo en el que se evidencia la construcción de un sujeto de la política ineludiblemente generizado. Los términos de ese debate continúan siendo inquietantemente actuales.