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Phase V Watershed Model

Phase V Watershed Model. We have 1994-2000 flows, revised March 2006. Used to drive CH3D We have May 2006 Phase V loads for WQM. Revisions to Phase V loads are possible. Phase IV.3 Loads. Phase V Loads. Phase IV.3 Loads. Phase V Loads. Phase IV.3 Loads. Phase V Loads. Phase IV.3 Loads.

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Phase V Watershed Model

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  1. Phase V Watershed Model • We have 1994-2000 flows, revised March 2006. Used to drive CH3D • We have May 2006 Phase V loads for WQM. • Revisions to Phase V loads are possible

  2. Phase IV.3 Loads Phase V Loads

  3. Phase IV.3 Loads Phase V Loads

  4. Phase IV.3 Loads Phase V Loads

  5. Phase IV.3 Loads Phase V Loads

  6. Phase IV.3 Loads Phase V Loads

  7. Conclusions • Total nitrogen and phosphorus loads appear to go down • Tributaries are more sensitive than main bay. Changes largely in most upstream stations • Scatter is reduced for nitrogen and phosphorus • No consistent difference for solids • No fundamental change in calibration status

  8. Sub-Grid-Scale SAV Model

  9. For every model cell, we have the following area increments: • < 0.5 m • 0.5 m < d < 1 m • 1 m < d < 1.5 m • 1.5 m < d < 2 m Keeping track of these areas and the SAV within will allow us to compute SAV area and compare to CBP data base

  10. Status • We will complete detailed examination of SAV in four key segments, one for each species. • We will look at annual areas for total and ten largest segments • SAV is currently implemented for one species, Vallisneria, everywhere. We need to tune and incorporate two more species

  11. CBP criteria for SAV survival is optical depth less than 1.6 to 2

  12. Optical Model • Model developed by Charles Gallegos, SERC • Rigorous calculation of diffuse light attenuation based on inherent optical properties of color, total suspended solids, chlorophyll • Parameter set from this study and other CBP-sponsored efforts

  13. Optical Model • Parameter set varies seasonally and, potentially, in 78 CBPS • A good deal of judgment was involved in parameter assignment when observations were unavailable. • The calculation is enormously time-consuming. Chuck created a 2,000,000 element look-up table that is incorporated in our model.

  14. Old Attenuation Model New Attenuation Model

  15. Old Attenuation Model New Attenuation Model

  16. Old Attenuation Model New Attenuation Model

  17. Estuarine Phosphorus Model • Initial coding of PIP in water quality model • PIP assumed to be completely inert • Behaves as TSS

  18. 70% of Choptank PP is PIP 47% of Potomac PP is PIP

  19. 58% of Susquehanna PP is PIP 62% of Patuxent PP is PIP

  20. No PIP With PIP

  21. No PIP With PIP

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