Hydrological Modelling of Small Scale Processes in a
Wetland Habitat
O. M. JOHANSEN, J.B. JENSEN & M.L. PEDERSEN
Aalborg 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-geological
settings
Methods
•
Data collection programme
Methods
•
•
Data collection programme
Combining local and regional distributed hydrological models
0.8 km2
Legend
Observation well
Spring
Regional model
Rich fen
Detailed model
235 km2
Methods
•
•
•
Data collection programme
Combining local and regional distributed groundwater models
Using models and field measurements for hypothesis testing
Methods
Data collection
Hypothesis
testing
Hydrological
modelling
Spring
Supply for fish farm
Rich Fen
Main results from stationary model simulations
Limestone aquifer
River
spring
Rich fen
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
5.25
Model
Observations
5.2
5.15
5.1
5.05
5
4.95
4.9
4.85
25May 01Jun 08Jun 15Jun 22Jun 29Jun 06Jul 13Jul 20Jul 27Jul 03Aug 10Aug
Thank you!