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Lecture8 - Cell-Automata Modeling of Ecohydrological...

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Cell-Automata Modeling of Ecohydrological Dynamics in Coastal Areas Ecohydrology CWR5140C Fall 2009
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Outline of Lecture Look at Sternberg et al. 2007 and Teh et al. 2008 papers. Focus on spatial and temporal dynamics of the couple mangrove-hammock competition for space under water and salinity stressors. Mangrove: salt tolerant, can't compete with hammocks when freshwater is present. Hammock: salt-intolerant, but can't compete with mangroves when flooding occurs
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Water Balance Salinity Balance
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Water Uptake (Transpiration) (1) Hammock: transpiration decreases fast as salinity increases (2) Mangrove: transpiration increases (slightly) as salinity increases Vegetation uptakes water from its cell and four neighboring cells (one single layer in the vertical direction
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Water Table Salinity Balance Dilution from seaward drainage (-) Infiltration from above (-) Infiltration from below (+) Dilution from seaward drainage (-)
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Model Simulations Model domain is 100 x 100 cells, 1 m 2 in area Topography based on transect data in coastal Everglades in South Florida Forcing by rainfall and tidal data (NWS), spatially distributed through random fields Initial distribution of mangrove and hammocks randomly in each cell Running 2-year average of salinity used to decide if cell switches vegetation type (5 ppt)
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Typical complex topography used in the model simulation. Vertical and horizontal axes are in
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