I: Modeling Flow Through Macrophytes

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• I Modeling Flow Through Macrophytes
• Macrophyte biomass changes markedly over time,
  can have significant impact on flow
  rate/residence time
• Knowing true flow important for
• Population community dynamics
• Fates and movements of nutrients chemicals
• Predicting effects of varying lake levels,
  anthropogenic changes

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Approach

• Modify existing hydrodynamic model (SI3D) to
  incorporate macrophytes
• Check results against experimental data -
  velocities, drag, etc.
• Use modified model to investigate how presence of
  macrophytes changes water residence time
• range of embayment size/geometry
• range of macrophyte abundance and locations
  within embayment

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Nepf and Vivoni (2000) Channel flow over plastic
plants
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Part II Incorporating Plankton Behavior
To what extent does migration affect washout?
Can it allow plankton to remain "indefinitely"?
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Normal migration Reverse migration No
migration

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MODELING APPROACH

• Combing hydrodynamic model with agent-based model
  for plankton behavior
• Investigate plausible migration behaviors under
  different flow regimes
• (Future) Model real embayment geometry, and
  compare with field data
• Diurnal and depth-specific sampling of
  zooplankton
• Dye experiments

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• Integration I BioEE 760 Readings in
  Biocomplexity Fall '02
• Targeted at project students
• Theme analysis of large-scale patterns, where
  experimental manipulations to test hypotheses are
  not feasible
• Untangling Ecological Complexity The
  Macroecological Approach, by Brian Maurer
• Recent papers on, e.g.,
• Scaling analyses of large-scale data sets (BBS,
  Gentry)
• Agent-based and spatial models for complex
  systems
• Food web analysis

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Integration II "How can we analyze our data?"

• Weekly discussion group for project members
• Start Fall '03, continue if other PIs rotate in
  as "host".
• We will
• Brainstorm on individual collaborative analyses
  and modeling
• Read papers with direct relevance to potential
  data analyses and modeling
• Present and discuss progress on analyses
• Respect data ownership. Any analyses will require
  explicit approval from the data generators, and
  will give them the option to participate in the
  analysis (and then coauthor any resulting
  publications).