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Now showing items 11-20 of 54
Tracer hydrology in a hydrometric data-limited and complex tropical mountainous region: the case of the Central American Isthmus
(European Geosciences Union, 2019)
Numerous socio-economic activities are dependent on the seasonal rainfall and groundwater recharge cycle across the Central American Isthmus. Demographic growth and unregulated land use changes resulted in extensive surface ...
Actitud hacia la Ciencia y la Enseñanza de la Ciencia en maestros de Segundo Ciclo: Región Norte
(Universidad Nacional (Costa Rica), 1998)
El problema de la enseñanza de ciencias ha sido preocupación en diferentes niveles del sistema educativo y en diferentes instituciones relacionadas con este. Estudios realizados a nivel universitario demuestran bajos ...
Evaluating watershed health in Costa Rican national parks and protected areas
(Springer Science and Business Media Deutschland GmbH, 2020-08-11)
Although the biodiversity of Costa Rican national parks, forests, and wetlands has been extensively surveyed, there has not
been a watershed assessment that refects their baseline water quality. Undoubtedly, the infux of ...
Headwaters drive streamflow and lowland tracer export in a large-scale humid tropical catchment
(John Wiley and Sons Ltd, 2020)
Headwaters are generally assumed to contribute the majority of water to downstream users, but
how much water, of what quality and where it is generated are rarely known in the humid tropics.
Here, using monthly monitoring ...
Groundwater flow modeling using iMOD for Barva and Colima aquifers in the Central Valley of Costa Rica: validation of a conceptual model using tracer data
(Universidad Nacional de Salta, 2018)
A stationary numerical model of groundwater flow was developed using iMOD to better understand the recharge processes within Barva and Colima aquifers (BCS), located in the northwestern region of the Central Valley of Costa ...
Residual nitrite in processed meat products in Costa Rica: Method validation, long-term survey and intake estimations
(Elsevier Ltd, 2021-05-12)
Ingestion of high amounts of nitrite due processed meat consumption could produce negative effects in human health. Here, we investigate long-term residual sodium nitrite content in processed meat products in Costa Rica ...
End member and Bayesian mixing models consistently indicate near-surface flowpath dominance in a pristine humid tropical rainforest
(John Wiley & Sons Ltd, 2021)
The impacts of forest conversion on runoff generation in the tropics have received much
interest, but scientific progress is still hampered by challenging fieldwork conditions and
limited knowledge about runoff mechanisms. ...
A preliminary isotope-based evapotranspiration partitioningapproach for tropical Costa Rica
(John Wiley and Sons Ltd, 2021-07)
Spatially and seasonally distributed information on transpiration (T) fluxes is limited in the tropics. Here, we applied a coupled isotope mass balance model to separate water fluxes of T and evapotranspiration (ET) from ...
Modelling non-stationary water ages in a tropical rainforest: A preliminary spatially distributed assessment
(John Wiley and Sons Ltd, 2020)
Pristine tropical forests play a critical role in regional and global climate systems. For a
better understanding of the eco-hydrology of tropical “evergreen” vegetation, it is
essential to know the partitioning of water ...
Evaluación de la variación de la concentración de los aldehídos en el agua de lluvia y aire en la Reserva Biológica Los Cusingos
(Universidad Nacional (Costa Rica), 2020)
Se determinó la concentración de siete aldehídos en muestras de aire y agua de lluvia en la Reserva Biológica Los Cusingos, ubicada en Quizarrá de Pérez Zeledón. Se realizaron tres muestreos, comprendidos entre junio y ...