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Hydrological Modelling of Small Scale Processes in a Wetland Habitat
O. M. JOHANSEN, J.B. JENSEN & M.L. PEDERSENAalborg University, Department of Civil Engineering - Water and Soil
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Objective of this study: • To simulate the detailed flow paths in Danish river valley
containing protected rich fens and natural springs. • Understanding and quantifying the hydrological processes
is an important step towards predicting the ecological responses in these habitats
Relevance: • A planned well field close to the habitat area initiated the
investigations
Focus in presentation:• The process of gaining knowledge on the hydrological
system
PhD student Ole Munch Johansen
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Location of the Lindenborg River system
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Hydro-geologicalsettings
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Methods
• Data collection programme
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Methods
• Data collection programme • Combining local and regional distributed hydrological
models
Observation wellSpringRegional modelRich fenDetailed model
Legend0.8 km2
235 km2
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Methods
• Data collection programme • Combining local and regional distributed groundwater
models• Using models and field measurements for hypothesis
testing
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Methods
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Spring
Supply for fish farmRich Fen
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Main results from stationary model simulations
springRich fen
River
Limestone aquifer
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Water level measurements
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Main results from stationary model simulations
• Flow through rich fen: 1.2 mm/day as average surface runoff-The flow is controlled by the vertical pressure gradient
• 80 % of the discharge to the river comes from natural springs (and does not flow through the rich fens or the river valley deposits)
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Recent and future work
25May 01Jun 08Jun 15Jun 22Jun 29Jun 06Jul 13Jul 20Jul 27Jul 03Aug 10Aug
4.85
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ModelObservations
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Thank you!