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Using ROMS to Model the Distribution of Hypoxic Water in
Narragansett Bay, RI USA
Deanna Bergondo and Chris KincaidUniversity of Rhode Island
Narragansett, RI 02852 [email protected]
University of Rhode Island
Narragansett Bay•Three drowned river valleys: West Passage, East Passage and Sekonnet River
•Five major rivers: Tauton, Blackstone, Pawtuxet, Woonasquatucket, and Moshassuck
•Mean salinity of 29-31ppt
•Tends to be moderately stratified in summer, though some areas can be highly stratified and at some times there can be strong mixing
Narragansett Bay
x
x
xx
x
x
x
Bullock Reach - July 2001
•High surface DO values
•Decrease in bottom DO values
•Bottom DO below 3 mg/L on 7/18
•Increased variability in Bottom DO beginning 7/21
Bullock Reach - August 2002
•High surface DO values
•Decrease in bottom DO values
•Bottom DO below 3 mg/L on 7/31
•Bottom DO recovers 8/6
Moderate to High QLow Tidal Range Low to Moderate Wind from the North
Low to Moderate QHigh Tidal Range Moderate Wind
High Tidal Range Strong Wind
Wind
Wind
Wind
Hypoxia in Narragansett Bay
Narragansett Bay
Pollution, rain created a toxic bathtub in Greenwich Bay Remedies will be neither easy nor cheap, environmentalists say.
Sunday, August 24, 2003 BY NEIL SHEA and DANIEL BARBARISI
Journal Staff Writers
Photo by Tom Ardito Narragansett Bay Estaury Program
http://www.savebay.org/index_next.asp
Greenwich Bay Fish Kill
Greenwich Bay Fish Kill
Photo by Tom ArditoNarragansett Bay Estaury Program
-10
-5
0
5
10
8/1 8/6 8/11 8/16 8/21 8/26 8/31
N-S
Com
pone
nt (
m/s
)
Wind To North Wind To South
-10
-5
0
5
10
8/1 8/6 8/11 8/16 8/21 8/26 8/31
E-W
Com
pone
nt (
m/s
)
Wind To East Wind to West
0.0
0.5
1.0
1.5
2.0
2.5
3.0
8/1 8/6 8/11 8/16 8/21 8/26 8/31
Pre
cipi
tati
on (
cm)
0
10
20
30
40
Riv
er F
low
(m
3 /s)
Precipitation
Flow
Hypoxia in Narragansett Bay 2003
0.0
0.2
0.4
0.6
0.8
1.0
1.2
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1.6
1.8
7/1 7/11 7/21 7/31 8/10 8/20 8/30 9/9 9/19 9/29
Tida
l Ran
ge (m
) .
Region of Stratification: Hypoxia
Region of De-Stratification
Hypoxia in Narragansett Bay 2003
Bergondo, Kester, Stoffel, and Woods, Marine Chemistry, In Press
Model Domain
Grid: 0.5 km x: 118 y: 70 z: 10
Flow Through Providence River Transect
Dep
th (
m)
Distance across channel (km)
Dep
th (
m)
Wind from North
Flow Through Providence River Transect
Distance across channel (km)
Wind from South
Dep
th (
m)
Dep
th (
m)
West
West East
East
Tracking Hypoxic Water6 m/s from SW 6 m/s from NE
East Passage
West Passage
0%
20%
40%
60%
80%
100%
0 50 100 150River Flow (m3/s)
Par
ticle
s
No Wind
Providence River
0%
20%
40%
60%
80%
100%
0 50 100 150
River Flow (m3/s)P
artic
les
3 m/s from South
Providence River
0%
20%
40%
60%
80%
100%
0 50 100 150River Flow (m3/s)
Par
ticle
s
3 m/s from West
Providence River
Tracking Hypoxic Water
ADCP DataUnder what conditions is water flushed from the Providence River into the Upper Bay and Greenwich Bay?
Future Work
•Create higher resolution grid for the Upper Bay and Providence River
•Incorporate data assimilation to the model
•Apply the Fasham based biological model to Narragansett Bay - compare with the results of the Kremer and Nixon ecological model and field data
•Use model to simulate nitrogen-reduction experiments taking place in the Bay
North Prudence Transect
ADCP Data from Providence River
Tracking Hypoxic Water