35 research outputs found
Saltwater intrusion in Denmark
Get PDFThe studies investigating saltwater intrusion in Denmark have been reviewed to identify the
main characteristics and features that have an impact on coastal aquifers interacting with the
sea. Traditionally, in regions with wet climate, saltwater intrusion is not appointed as a frequent
problem and it is more commonly linked to areas affected by water scarcity. Nevertheless, multiple
factors that can induce the salinization of coastal aquifers have been found for Denmark
such as the presence of coastal drained lowlands with the water table below the sea level or
karstic features and buried valleys in carbonate and detrital systems respectively that can act
as preferential flow paths for saline water. Eustatic changes have been also played an important
role in the salinization of aquifers, in deep aquifers saline ancient connate water can be identified
and in small islands, a delicate equilibrium of freshwater lenses is generated over saline
water. As the water supply in this country depends almost exclusively on groundwater, saltwater
intrusion can jeopardize fresh groundwater resources in coastal areas. An overview of the cases
already studied, questions about the magnitude of these issues and the future perspectives
with climate changes are discussed to put into context what is already known and what are the
next challenges.Se han revisado los estudios que han investigado la intrusión marina en Dinamarca para identificar
las principales características que afectan a los acuíferos costeros en su interacción con el
mar. Tradicionalmente, en regiones con clima húmedo, la intrusión marina no es considerada
como un problema frecuente ya que se suele asociar con áreas afectadas por la escasez de
agua. Sin embargo, se han identificado múltiples factores que pueden generar la salinización de
acuíferos costeros en Dinamarca como la presencia de tierras bajas drenadas a lo largo de la
costa con niveles freáticos por debajo del nivel del mar o el flujo preferente a través de morfologías
kársticas o paleovalles en acuíferos carbonatados o detríticos respectivamente. Los cambios
eustáticos han jugado también un papel importante en la salinización de acuíferos, en
acuíferos profundos se pueden llegar a identificar aguas connatas antiguas y en islas de reducido
tamaño, se establece un delicado equilibrio con lentes de agua dulce sobre aguas salinas.
Debido a que este país depende casi exclusivamente de las aguas subterráneas para el abastecimiento
de la población, la intrusión marina podría poner en riesgo los recursos subterráneos
de agua dulce en las zonas costeras. La revisión de casos estudiados plantea una serie de
cuestiones acerca de la magnitud de los problemas existentes y las perspectivas futuras considerando
cambios climáticos. Con esta revisión se ha puesto en contexto el estado actual de
conocimiento acerca de la intrusión marina en el país y se han identificado los desafíos que
podría ser necesario acometer en el futuroNext-Generation EU funding: Programa Maria Zambrano Senior MZSA0
Deep saltwater in Chalk of North-West Europe: origin, interface characteristics and development over geological time
Get PDFHydrologiske konsekvenser af historiske og fremtidige klimatiske ændringer i Vestjylland
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Climate change: Sources of uncertainty in precipitation and temperature projections for Denmark
Get PDFGlobal Climate Models (GCMs) are the main tools used to assess the impacts of climate change. Due to their coarse resolution, with cells of c. 100 km × 100 km, GCMs are dynamically downscaled using Regional Climate Models (RCMs) that better incorporate the local physical features and simulate the climate of a smaller region, e.g. a country. However, RCMs tend to have systematic biases when compared with local observations, such as deviations from day-to-day measurements, and from the mean and extreme events. As a result, confidence in the model projections decreases. One way to address this is to correct the RCM output using statistical methods that relate the simulations with the observations, producing bias-corrected (BC) projections.
Here, we present the first assessment of a previously published method to bias-correct 21 RCM projections of daily temperature and precipitation for Denmark. We assess the projected changes and sources of uncertainty. The study provides an initial assessment of the bias correction procedure applied to this set of model outputs to adjust projections of annual temperature, precipitation and potential evapotranspiration (PET). This method is expected to provide a foundation for further analysis of climate change impacts in Denmark.
 
Precipitation, recharge, evapotranspiration, latent heat flux, sensible heat flux, ground heat flux, net radiation and soil moisture estimates in the period 2010-2015 at an agricultural field site in the western part of Denmark
No full textThe dataset includes all major terms of the water and energy balance at an agricultural field site in the western part of Denmark. Precipitation, recharge, evapotranspiration, latent heat flux, sensible heat flux, ground heat flux and net radiation is given as daily sums, while soil moisture content is given as daily moving average. Soil moisture content is measured by three different methods: 1) a point capacitance sensor (5 sensors at three depths) and a capacitance sensor network (30 sensors at three depths), 2) Time Domain Reflectometry (TDR) and 3) a cosmic-ray neutron sensor (CRNS). All measurements were collected in the period 2010-2015. The procedures of the measurements, including, measurement height and depths, is described in Denager et al, 2020
Regional differences in climate change impacts on groundwater and stream discharge in Denmark
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