Examinando por Autor "Carol, Eleonora S."

Mostrando 1 - 4 de 4
  • Artículo
    Embargado
    Hydrochemical characterization of the water resources in the coastal environments of the outer Río de la Plata estuary, Argentina
    (2012) Carol, Eleonora S.; Kruse, Eduardo
    Hydrogeochemical processes affecting the chemical composition of groundwater and surface water in the coastal areas of the central and northern sectors of the outer Río de la Plata estuary in Argentina are evaluated. Results indicate hydrochemical differences between the three hydrological units analyzed. In shell ridges, groundwater is a low-salinity sodium bicarbonate type with a predominance of CO2(g)dissolution, carbonate dissolution and ion exchange. In the coastal plain, groundwater is a saline sodium chloride type and its chemical characteristics are related to the contribution of water from the estuary, the dissolution of gypsum and halite, and the oxidation of pyrite. Surface waters are a sodium chloride type and their composition shows the incidence of tidal water flowing into the continent. In this area a wetland occurs and it is regarded as a natural reserve that depends to a large extent on its hydrological characteristics. Knowledge of the processes regulating the hydrochemistry would constitute an essential tool in the management and preservation of the environmental characteristics of this system.
  • Parte de libro
    Embargado
    Interrelation between Coastal Processes Surface Water and Groundwater at the Outer Coastal Region of the Rio de la Plata Estuary, Argentina
    (2011) Pousa, Jorge; Kruse, Eduardo; Carol, Eleonora S.; Carretero, Silvina; Guaraglia, Dardo
    The outer coastal region of the Rio de la Plata estuary, Argentina, presents two adjacent, yet different environments: the Samborombon Bay wetland and a dune barrier system on the eastern sandy coastline of the Province of Buenos Aires. These environments have their own characteristics as regards the interrelation between coastal processes, surface water and groundwater. Though in a different degree, both environments have undergone salt water encroachment of the phreatic aquifer, coastal erosion and relative sea level rise processes due to natural and anthropic factors. Coastal areas have been exposed to a variety of hazards, such as salinization, severe storm surges, high frequency and degree of flooding and littoral erosion processes. Human activities, such as beach sand mining, dune fixation and destruction, construction of coastal structures and exploitation of aquifers without an adequate knowledge of the hydrology setting and a rational management program, have worsen these natural hazards. Uncontrolled anthropic action has induced environmental damage to the overall coastal dune barrier system and plains. The Samborombon Bay wetland and the beach dune system environments play an important role with respect to the social and economic development based on agriculture, cattle-raising, fishing and tourism. Results of investigations on saltwater contamination, sea level rise, storm surges, erosion processes and morphological changes recently performed in these two coastal environments are presented here. Future possible scenarios are briefly considered within the context of climate change. Potentially methods for measuring groundwater flux in the sandy environment are discussed as regards their applicability to the study area.
  • Artículo
    Embargado
    Physicochemical characterization of sediments from the coastal wetland of Samborombón Bay, Argentina
    (2012) Carol, Eleonora S.; Kruse, Eduardo; Tavani, Eduardo Luis
    An exhaustive physicochemical characterization of sediments collected in the southern part of the coastal wetland of Samborombón Bay, Buenos Aires province, Argentina, was carried out to determine if the nitrogen and the phosphorus found derive from the organic matter. Samples were extracted from different geological environments: coastal plain, sand sheets, intertidal plain and water courses. Aspects analyzed involved the identification of mineralogical species present in sediments, distribution of grain size and specific surface. Major components were quartz and feldspars, while in some samples traces of calcite, hematite or kaolinite were found. As a novel fact, it is important to highlight that the ignition of sediments for organic matter valuation by weight loss was made between 200 and 500°C. In this way, the thermal breakdown and the exclusion of the released hydration water were assured. Likewise, it was established that specific surface is an aspect conditioned by the hydrology of the system. Standard techniques were used for the chemical analysis of organic carbon, nitrogen and phosphorus. The most abundant element was organic carbon (0.279–2.840%w/w), with nitrogen (0.200–0.522%w/w) and phosphorus (0.028–0.185%w/w) following in descending order. The results obtained show a different source for each of the two macronutrients studied: organic matter for nitrogen and inorganic substances for phosphorus. Finally, it was determined by means of the C:N ratio that the organic matter is of marine origin.
  • Artículo
    Acceso Abierto
    Salinización de suelos en marismas
    (2015) Carol, Eleonora S.; Kruse, Eduardo; Cellone, Francisco A.
    En el sector sur de la Bahía de Samborombón (Buenos Aires, Argentina) se desarrolla una extensa marisma que forma un humedal intermareal. En ella se realizaron distintas obras de ingeniería con el fin de evitar el ingreso del flujo mareal y lograr una mayor extensión del área de pastoreo. El objetivo del trabajo es evaluar si la regulación de los flujos mareales ocasiona una modificación en el contenido de cloruros en los sedimentos superficiales, afectando la salinidad de los suelos del humedal. Se realizaron interpre- taciones de imágenes satelitales, relevamientos de campo, muestreos de sedimentos y mediciones de niveles y conductividad eléctrica del agua superficial y subterránea. Los resultados obtenidos permitieron reconocer cómo las obras de ingeniería (terraplenes de contención y caminos internos) alteran el comportamiento hidrológico natural y en consecuencia el contenido de cloruros en el sedimento. Problemas de salinización de suelos se reconocen en sectores donde el agua mareal se acumula y luego se evapora formando precipitados de halita. Las futuras obras deberán planificarse de forma tal de minimizar la alteración de los flujos de agua con el fin de lograr un manejo sustentable de los recursos naturales en el humedal.