Hydrological Modelling of Small Scale Processes in a Wetland Habitat O. M. JOHANSEN, J.B. JENSEN &...
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Transcript of Hydrological Modelling of Small Scale Processes in a Wetland Habitat O. M. JOHANSEN, J.B. JENSEN &...
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
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
Location of the Lindenborg River system
Hydro-geologicalsettings
Methods
• Data collection programme
Methods
• Data collection programme • Combining local and regional distributed hydrological
models
Observation wellSpringRegional modelRich fenDetailed model
Legend0.8 km2
235 km2
Methods
• Data collection programme • Combining local and regional distributed groundwater
models• Using models and field measurements for hypothesis
testing
Methods
Spring
Supply for fish farm
Rich Fen
Main results from stationary model simulations
springRich fen
River
Limestone aquifer
Water level measurements
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)
Recent and future work
25May 01Jun 08Jun 15Jun 22Jun 29Jun 06Jul 13Jul 20Jul 27Jul 03Aug 10Aug
4.85
4.9
4.95
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5.05
5.1
5.15
5.2
5.25
ModelObservations
Thank you!