Participant 2 DHI Water and Environment DHI

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Participant 2 DHI Water and Environment (DHI)
Erik Kock Rasmussen, biologist Role lead of the
dynamic hydrological/hydrodynamic/ecological
modelling Dr. Ole S. Petersen (engineer) Role
Hydrodynamic modelling Flemming Møhlenberg
(biologist) Role Link between dynamic modellers
and statistical analyses.
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MIKE - Model Structure

• Disharge
• Precipitation
• Evaporation

• Water levels
• Fluxes
• Wind
• Temperature

Hydrodynamic modelling

• Initial values
• Boundaries

• Point sources
• Diffuse sources

Advection-Dispersion modelling
Effects on

• Temperatur
• Salinity

Nutrient load
Ecological modelling
Water level, current, salinity Chlorophyll, subm.
Vegetation, nutrients, BOD, Oxygen,
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Ecological model, carbon cycle
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MIKE EU

• The simulated 12 components or the state
  variables of the model are
• Phytoplankton carbon (PC) (g/m3)
• Phytoplankton nitrogen (PN) (g/m3)
• Phytoplankton phosphorus (PP) (g/m3)
• Chlorophyll-a (CH) (g/m3)
• Zooplankton (ZC) (g/m3)
• Detritus carbon (DC) (g/m3)
• Detritus nitrogen (DN) (g/m3)
• Detritus phosphorus (DP) (g/m3)
• Inorganic nitrogen (IN) (g/m3)
• Inorganic phosphorus (IP) (g/m3)
• Dissolved oxygen (DO) (g/m3)
• Benthic vegetation carbon (BC) (g/m2)
• Add on Benthic vegetation split into macroalgae
  Rooted vegetation
• Add on Sediment N P module.

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MIKE 21, 3-D Finite Element Model System

• Hydrodynamic module
• (Water level, discharge velocity)
• Advection dispersion module
• (Transport of substances)
• Ecological Module
• (22 state variablesTN, TP, IN, PO4, Chl-a,
  Zooplankton, N and P in sediment, Rooted
  vegetation, Macroalgae)

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MIKE 21, 3-D Finite Element Model System

• Hydrodynamic module
• (Water level, discharge velocity)
• Advection dispersion module
• (Transport of substances)
• Ecological Module (ECO-lab )
• (22 state variablesTN, TP, IN, PO4, Chl-a,
  Zooplankton, N and P in sediment, Rooted
  vegetation, Macroalgae)

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Development of ECO-lab
ECO-lab released July 2003 for MIKE 21
3D ECO-lab template Eutrophication (EU) model
with 13 state variable Sep. 2003 P.Plankton,
Zoopl. NH4,NO4, PO4, DC,DN,DP, DO ECO-lab
template Mytilys e. population EU model 50
state variables, Oct. 2003 ECO-lab template EU
model with macroalgae rooted submerged
vegetation sediment N, P to be released summer
2004, 22 state variables ECO-lab for FM to be
released May-July 2004
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Eco-lab applications Ringkøbing Fjord Løgstør
Broad, Danish Straits
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Secchi depth Ringkøbing Fjord1992 (6-8 PSU),
2001 (10-14 PSU)
Phytoplankton dominate
Filtration by Mya areneria
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Secchi dept, PSU from 10-14 to 6-8
Mya a. can not reproduce below 13 PSU, SD decrease
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Shell fish (Mytilus e.) population model in
ECO-lab based on a 3-D model of Løgstør
BroadBoundary Data MIKE 11 1-2 weekly data on
water chemistry
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Measured Load in rivers channels for the
ecological model Table 3
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Boundary condition at the Sea for the Ecological
modelTable 4
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Forcing functions Ecological modelTable 5
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Calibration validation dataecological
modelTable 6