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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. - PowerPoint PPT Presentation
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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
Phase V Loads
Phase IV.3 Loads
Phase V Loads
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
Sub-Grid-Scale SAV Model
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
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
CBP criteria for SAV survival is optical depth less than 1.6 to 2
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
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.
Old Attenuation Model
New Attenuation Model
Old Attenuation Model
New Attenuation Model
Old Attenuation Model
New Attenuation Model
Estuarine Phosphorus Model
• Initial coding of PIP in water quality model
• PIP assumed to be completely inert
• Behaves as TSS
Sa n d-si ze
Ex ch . P
R efrac to r y P
Silt /C lay-siz e
E xch . P
R efr acto ry P
R esu sp en d ed
E xch . P
R efr acto ry P
D iss ol ved
P h o sp h ate
R efr acto ryP artic u late
O rg an icP h os p h or u s
L a b ilePa rticu late
Or g an icPh o sp h o ru s
D isso lv edO rg an ic
P h o sp h or u s
Sediments
T w oZ o o pl an kto n
G ro u p s
T h r ee A lg alG ro u p s
m in er aliz atio n
h yd ro lysis
p re da tio n
resp ir atio n
min
eral
izat
ion u
pta
ke
Se ttlin g a nd res u sp en sio n
P articulate Ino rganic P
E xtern al L o ad in g
D O P Up take ?
Sa n d-si ze
Ex ch . P
R efrac to r y P
Silt /C lay-siz e
E xch . P
R efr acto ry P
R esu sp en d ed
E xch . P
R efr acto ry P
D iss ol ved
P h o sp h ate
R efr acto ryP artic u late
O rg an icP h os p h or u s
R efr acto ryP artic u late
O rg an icP h os p h or u s
L a b ilePa rticu late
Or g an icPh o sp h o ru s
L a b ilePa rticu late
Or g an icPh o sp h o ru s
D isso lv edO rg an ic
P h o sp h or u s
Sediments
T w oZ o o pl an kto n
G ro u p s
T h r ee A lg alG ro u p s
T h r ee A lg alG ro u p s
m in er aliz atio n
h yd ro lysis
p re da tio n
resp ir atio n
min
eral
izat
ion u
pta
ke
Se ttlin g a nd res u sp en sio n
P articulate Ino rganic P
E xtern al L o ad in g
D O P Up take ?
70% of Choptank PP is PIP
47% of Potomac PP is PIP
58% of Susquehanna PP is PIP
62% of Patuxent PP is PIP
With PIP
No PIP
With PIP
No PIP
