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Accueil du site → Doctorat → Argentine → Estudio integral de los recursos hídricos y las coberturas del suelo de la cuenca media y baja del Río Sauce Grande (Argentina)

Universidad Nacional del Sur (2020)

Estudio integral de los recursos hídricos y las coberturas del suelo de la cuenca media y baja del Río Sauce Grande (Argentina)

Brendel, Andrea Soledad

Titre : Estudio integral de los recursos hídricos y las coberturas del suelo de la cuenca media y baja del Río Sauce Grande (Argentina)

Auteur : Brendel, Andrea Soledad

Université de soutenance : Universidad Nacional del Sur

Grade : Doctor en Geografia 2020

Résumé partiel
Hydrographic basins are systems related to natural (such as geomorphology, climate, soil, water, vegetation), and anthropic factors (i.e., agricultural activities). The main objectives of this thesis were to evaluate the effect of rainfall variability on the primary water resources of the Sauce Grande river basin (SW of the province of Buenos Aires), as well as to analyze the Spatio-temporal behavior of its limnological parameters. Moreover, the dynamics of the flow of the Sauce Grande river and the local atmospheric circulation were studied. The purpose was to determine its origin and the effects of the sea breeze on this water body. First of all, the meteorological anomalies were analyzed considering the period 1960-2017. This information was obtained from three meteorological stations located in the north, the center, and the south of an influence area of the basin. The results indicated that the temperature increased (+0.5 °C in the north and + 0.8 °C in the south), while the wind speed decreased (-1 km/h in the south and -3,3 km/h in the north). The precipitation trend was spatially heterogeneous since it increased in the north and south (+42 mm and +16 mm, respectively), and decreased in the center (-6 mm). This parameter was studied based on the spatial and temporal variation of the water coverage of the two primary water resources of the Sauce Grande river basin : the Paso de Las Piedras dam and the Sauce Grande shallow lake during the period 1987-2017. The results evidenced that the water coverage and the precipitation have a positive and statistically significant linear agreement. The areal variation of the Sauce Grande shallow lake was explained by precipitation in 67 %, while in the Dique Paso de las Piedras dam in 55 %. The increase and reduction periods presented a relationship with the annual rainfall amount. As a consequence, morphometric parameters ranged widely, observing the most extensive changes in the area, the perimeter, and the maximum length.

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Page publiée le 17 janvier 2021