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Evaluation of water resources in a high-mountain basin in Serra da Estrela, central Portugal, using a semi-distributed hydrological model
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Orientador(es)
Resumo(s)
High-mountain basins provide a source of
valuable water resources. This paper presents hydrological
models for the evaluation of water resources in the highmountain Zeˆzere river basin in Serra da Estrela, Central
Portugal. Models are solved with VISUAL BALAN v2.0, a
code which performs daily water balances in the root zone,
the unsaturated zone and the aquifer and requires a small
number of parameters. A lumped hydrological model fails
to fit measured stream flows. Its limitations are overcome
by considering the dependence of the temperature and
precipitation data with elevation and the spatial variability
in hydrogeomorphological variables with nine sub-basins
of uniform parameters. Model parameters are calibrated by
fitting stream flow measurements in the Zeˆzere river.
Computed stream flows are highly sensitive to soil thickness, whereas computed groundwater recharge is most
sensitive to the interflow and percolation recession coefficients. Interflow is the main component of total runoff,
ranging from 41 to 55% of annual precipitation. High
interflows are favored by the steep relief of the basin, by
the presence of a high permeability soil overlying the
fractured low permeability granitic bedrock and by the
extensive subhorizontal fracturing at shallow depths. Mean
annual groundwater recharge ranges from 11 to 15% of
annual precipitation. It has a significant uncertainty due to
uncertainties in soil parameters. This methodology proves
to be useful to handle the research difficulties regarding a
complex mountain basin in a context of data scarcity.
Descrição
Palavras-chave
High-mountain hydrology Groundwater recharge Water balance Semi-distributed hydrological model Serra da Estrela Portugal
Contexto Educativo
Citação
Espinha Marques, J., Samper, J., Pisani, B., et al. (2011). Evaluation of water resources in a high-mountain basin in Serra da Estrela, central Portugal, using a semi-distributed hydrological model. Environmental Earth Sciences, 62(6), 1219–1234. https://doi.org/10.1007/s12665-010-0610-7.
Editora
Springer