Regional groundwater model of north-east Belgium

Gedeon, Matej; Wemaere, I.; Marivoet, J.

doi:10.1016/j.jhydrol.2006.11.006

Cited by 33 publications

(19 citation statements)

References 3 publications

(3 reference statements)

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“…Previous groundwater flow models that included the Kleine Nete basin used a variety of concepts to represent the geological units playing a role in the local hydrology of the study basin: Batelaan and De Smedt (2004) and Gedeon et al (2007) conceptualized all geological units above the Boom clay as one layer while Verbeiren et al (2006) used five layers according to the geological units listed in Table 1. In both cases satisfying calibration results were obtained.…”

Section: Groundwater System Modelingmentioning

confidence: 99%

Spatio-temporal impact of climate change on the groundwater system

Dams

Salvadore

Daele

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. Given the importance of groundwater for food production and drinking water supply, but also for the survival of groundwater dependent terrestrial ecosystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the groundwater system of a lowland catchment in Belgium. Our results show for the scenario period 2070-2101 compared with the reference period 1960-1991, a change in annual groundwater recharge between −20 % and +7 %. On average annual groundwater recharge decreases 7 %. In most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the groundwater level to decrease significantly from September to January. On average the groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10 %, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the groundwater system, close monitoring of groundwater and implementation of adaptive management measures are required to prevent ecological loss.

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Section: Groundwater System Modelingmentioning

confidence: 99%

Spatio-temporal impact of climate change on the groundwater system

Dams

Salvadore

Daele

et al. 2012

Hydrol. Earth Syst. Sci.

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“…Because a generic repository was investigated, a groundwater model for the entire Netherlands was set up. This contrasts with many groundwater flow studies for disposal of nuclear waste, such as the Forsmark site in Sweden (Hartley & Joyce, 2013), a site in northeast Belgium (Gedeon et al, 2007), the Olkiluoto site in Finland (Blessent et al, 2011), the Sellafield site in the UK (Blum et al, 2005) and Yucca Mountain in the USA (Bodvarsson et al, 1999), where site-specific studies could be performed.…”

Section: Introductionmentioning

confidence: 93%

Far-field transport modelling for a repository in the Boom Clay in the Netherlands

Valstar

Goorden

2016

Netherlands Journal of Geosciences

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A groundwater model was set up to study far-field transport for the potential of a radioactive waste repository the Boom Clay in the Netherlands.The existing national groundwater model, the Netherlands Hydrological Instrument, was extended in the vertical direction to include geological formation up to and beyond the Boom Clay. As the amount of hydrogeological data in the deeper subsurface is limited, simplifications in the model schematisation were necessary. Moreover, nationwide data about the tops and bottoms of many of the deeper geological formations and their members are lacking and required interpolation. Finally, values for hydrogeological parameters, such as porosity and hydraulic conductivity, are also lacking for the deeper formations. These values were estimated using relationships with depth and lithology. Moreover, no quantitative data about heterogeneity within the deeper geological formations or its members were available.In the Dutch research programme on the geological disposal of radioactive waste (OPERA), the post-closure safety of a generic repository is assessed in either Boom Clay or rock salt. Disposal of Dutch radioactive waste is not foreseen in the next decades and a choice of host rock has not been made. In the early, conceptual phase of the radioactive waste disposal process in the Netherlands no potential repository locations were selected and a groundwater flow model for the entire Netherlands was build. As a starting point a geological disposal facility is assumed to be present at a depth of at least 500 m within a Boom Clay formation of 100 m in order to be able to make an assessment of post-closure safety with this geological formation in a disposal concept. With these assumptions, a general idea of potential flow patterns has been obtained and broken down into pathline trajectories. These trajectories were calculated to achieve input for the potential transport of radioactive isotopes (radionuclides) from this waste in the Netherlands after the closure of a disposal facility in Boom Clay.The groundwater flow patterns in the deeper subsurface strongly resemble the larger scale flow patterns in the shallow subsurface, with flow from infiltration areas in the east and the south of the Netherlands towards to seepage areas of the polders in the west and the northern part of the country or towards the river valleys of the Rhine and IJssel. Groundwater flow velocities, however, are much lower in the deeper part of the model and consequently travel times are much larger. The conservative travel times from the pathlines range from a few 1000 years to more than 10,000,000 years depending on the location for the repository. Longer travel times are obtained for locations with a downward groundwater flow in the Boom Clay.Because of the simplifications in the model schematisation and the uncertainty in the model parameters, the present results should only be considered as a first indication. Moreover, the model could not be validated due to a lack of validation data. However, the ins...

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“…First, the recharge rate was adjusted to minimize the difference between the observed and calculated groundwater level contour maps and heads. When this was achieved, the hydraulic conductivity and the specific yield were adjusted to minimize the variance of the differences [40]. The final hydraulic conductivity and the specific yield are shown in Table 1.…”

Section: Model Calibration and Sensitivity Analysismentioning

confidence: 99%

Numerical Simulation of Groundwater Flow in a River Valley Basin in Jilin Urban Area, China

Qiu

Liang

Xiao

et al. 2015

Water

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Abstract:In order to evaluate the groundwater resources and aquifer system of the Jilin urban area (JUA), a groundwater numerical flow model was established by using the groundwater modeling system based on data from 190 boreholes. River stages were interpolated to control the groundwater flow field. The input parameters such as hydraulic conductivity and specific yield were based on data from 260 pumping test data. The model was calibrated by trial and error, simulated results were compared to the observed head and contour maps, which were generally in good agreement, and the root mean squared error was 0.66 m. Sensitivity analysis was carried out and recharge proved to be the most sensitive factor in this model. The water budget showed that the input was 2.07× 10

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Regional groundwater model of north-east Belgium

Cited by 33 publications

References 3 publications

Spatio-temporal impact of climate change on the groundwater system

Spatio-temporal impact of climate change on the groundwater system

Far-field transport modelling for a repository in the Boom Clay in the Netherlands

Numerical Simulation of Groundwater Flow in a River Valley Basin in Jilin Urban Area, China

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