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mia9

Dataset card Data Studio Files
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Jan-87
Jan-89
Jan-91
Jan-93
Jan-95
Jan-97
Jan-99
Jan-01
Jan-03
Jan-05
Jan-07
Jan-09
Jan-11
Jan-13
Zcusum (sd)
pH units
pH Lab pH Lab CT Zcusum
-10
-5
0
5
10
15
20
25
30
35
Jan-79
Jan-81
Jan-83
Jan-85
Jan-87
Jan-89
Jan-91
Jan-93
Jan-95
Jan-97
Jan-99
Jan-01
Jan-03
Jan-05
Jan-07
Jan-09
Jan-11
Jan-13
Zcusum (sd)
Na CT Zcusum Cl CT Zcusum C a Mg K Na NH4 NO3 C l SO4 pH Lab
Average 0.251 0.143 0.098 1.078 0.159 0.811 1.868 1.178 5.182
Median 0.147 0.080 0.045 0.610 0.082 0.592 1.050 0.880 5.080
St.Dev. 0.493 0.218 0.203 1.489 0.221 0.866 2.581 1.110 0.522
Minimum 0.009 0.006 0.003 0.048 0.004 0.009 0.090 0.069 3.950
Maximum 9.795 2.656 3.570 15.910 2.200 11.970 26.890 15.420 7.360
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Bay waters
Our flow calculations with available data for rain, canal discharge, groundwater and
overland flows from DERM, NOAA, SFWMD, USGS and DBHYDRO datasets, render a
total average of monthly freshwater flow to Biscayne Bay south of Rickenbacker
Causeway of 150 million cubic meters per month. Canal discharge to the bay is the
largest contributor to freshwater budget with 66 million cubic meters per month
(MMm3
/m) or 44% of the total flow, while rain, groundwater and overland flow supply 61
(40%), 15 (10%) and 8 (6%) MMm3 per month respectively. Average monthly loss due
to evapotranspiration is 79 MMm3
, or 53% of the total input (Fig 2.7).
Figure 2.7: Average flow contributions (million m3
/month) to Biscayne Bay south of
Rickenbacker Causeway.
Main canals draining into Central and South Biscayne Bay from just south of
Rickenbacker Causeway to Manatee Bay, include Coral Gables Waterway (C-3),
Snapper Creek (C-2), Cutler Drain (C-100), ), Black Creek (C-1), Princeton Canal (C102), Military Canal, Mowry Canal (C-103), Card Sound (S20) and the Aerojet Canal (C111). Additionally, some water from the Miami River, draining into the southern North
Biscayne Bay flows south under Rickenbacker Causeway and into North-Central BB.
Finally, there are some plugged canals and mosquito ditches which despite not
emptying directly into Biscayne Bay, affect groundwater contribution to the bay by
modifying the local groundwater level (i.e. North Canal and Florida City Canal south of
Mowry Canal). Previous exchange dynamics studies (Wang et al. 2003; Nuttle et al.
2000) rendered average water residence times in the order of 1 month for the bay,
ranging from practically zero close to inlets and the Safety Valve to 3-4 months in the
southern extreme at Manatee Bay and Barnes Sound.
726
790
101
177
Rain
Canal Q
Overland
Groundwater
25
Although Biscayne Bay waters are in general oligotrophic, water composition is
not uniform across the bay (Fig. 2.8). North Bay, the most affected by urban
development, is the highest in DIN, TP, CHLa, SiO2 and Turbidity, while oceanic waters
on the reef-track display the lowest nutrient concentrations. Central Bay, impacted by
urban and industrial development, shows values which are intermediate for all variables.
Finally, South Biscayne Bay, with moderate urban development, extensive agricultural
development and surrounded by wetlands, has the lowest TP, CHLa, SiO2 and the
highest salinity range, TN and TOC concentrations.
Figure 2.8: Box-plots of WQ biogeochemical variables in different sectors of Biscayne
Bay.
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