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Betydelse av datakvalitet vid modellering av grundvatten: The Importance of Data Quality in Groundwater Modelling
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2015 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Groundwater modelling can be applied within many fields, such as aid for geotechnical

examinations and contaminant transport. In many cases however, groundwater modelling

is not used due to the need of large data quantities. A sensitivity analysis has been

conducted for hydraulic conductivity, groundwater recharge and data resolution in time

and space, to examine what parameters affects the result most. A reference case was

calibrated to form the basis of the analysis.

The reference case was formed by a ground model scanned with laser from a plane, probes

for the level dividing friction soil and clay, a base model composed by interpretations and

probes for base level and 19 groundwater pipes. These data were then scaled down where

geological and hydrological data were changed in different experiments. It was clear that

the amount of information points was not as important as the placement of them. For both

types of data it was important to spread out probe points and make sure that peaks in the

topography were included.

The results generally showed that recharge areas on a higher altitude are the most

important recharge areas. These areas have no other water supply unless further boundary

conditions apply. A change in the hydraulic conductivity in the friction earth gave a larger

difference in model results than when an equally large change in hydraulic conductivity

was applied in the clay layer. The largest difference in the model result occurred when

the same change was applied for both layers at the same time. The reason the hydraulic

conductivity in the friction soil layer matters so much is because it is the layer through

which water travels. A change in the clay

’s hydraulic conductivity does not pose an

obstacle in the same way it does in the friction soil.

A change in the hydraulic conductivity gave a smaller change in model results than an

equal percentage change in groundwater recharge. Since higher uncertainties are

associated with hydraulic conductivity an extended sensitivity analysis was performed for

this parameter. This analysis showed that a change in hydraulic conductivity gives rise to

larger differences in model results than for a change in groundwater recharge within their

reasonable uncertainty ranges.

Place, publisher, year, edition, pages
UPTEC W, ISSN 1401-5765 ; 15030
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-260204OAI: oai:DiVA.org:uu-260204DiVA: diva2:846653
External cooperation
Tyréns AB
Educational program
Master Programme in Environmental and Water Engineering
Available from: 2015-09-01 Created: 2015-08-17 Last updated: 2015-09-01Bibliographically approved

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