san diego · san diego ploo pt. loma sboo islas coronados 9 m i l e b an k s i l v e r s t r a nd c...
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Oceanside Littoral C
ell
ESCONDIDO CREEK
SAN DIEGO RIVER
OTAY RIVER
LOS PENASQUITOS CREEK
TIJUANA RIVER
LUSARDI CREEK
RIO TIJUANA
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0 10 205 Kilometers
Mexico
La Jolla
San Diego
Pt. LomaPLOO
SBOO
Islas Coronados
9 Mile Bank
Silver Strand Cell
Mission Bay Subcell
La JollaCanyon
Loma Sea Valley
Coronado Canyon
Tijuana River
Mission Bay
SDBay
Figure 1. Map of marine shelf of San Diego County. Bathymetric units are meters. Locations of littoral cells, submarine canyons, outfalls (PLOO and SBOO), rivers, and Kelp Forests (shaded areas close to shore) are indicated.
0 6 123 Kilometers
LA-5
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E21
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E19
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E26
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E23
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Figure 2. Map of benthic monitoring stations offshore of Pt. Loma. Bathymetric units are meters. The location of the LA-5 dredge disposal site is also indicated.
0 6 123 Kilometers
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Figure 3. Map of megabenthic trawling stations offshore of Pt. Loma. Bathymetric units are meters. The location of the LA-5 dredge disposal site is also indicated.
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Figure 4. Map of bioaccumulation study sites offshore of Pt. Loma. Bathymetric units are meters. The location of the LA-5 dredge disposal site is also indicated.
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LA-4
LA-5SEDsAll EventsPHImedian
1.700000 - 2.200000
2.200001 - 2.700000
2.700001 - 3.200000
3.200001 - 3.700000
3.700001 - 4.200000
Figure 5. Mean of median grain sizes (PHI) for PLOO sediment stations. Note, PHI increases with decreasing grain size.
Figure 6. Satellite imagery of Pt. Loma during the period that the outfall was ruptured in 1992. Note the spatial distribution of waters emanating from Mission and San Diego Bays, and the current reversal of plume. False color represents surface temperatures. Warmer temperatures are indicated by red.
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LA-4
LA-5
sdbackscatterValue
High : 248.447449
Low : 99.524330
Figure 7. Spatial distribution of backscatter on the shelf off San Diego. Data are from a studyby Gardner et al. (1998).
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B8
E19
E7
E1
B12B9E26
E25E23
E20
E14
E17E11
E8E5
E2
B13
B10E21
E15
E9
E3
Stress: 0.02
Figure 8. MDS plot of sediment composition. Data used for analysis are from sediment samples from 2001 and include median value of PHI, standard deviation of PHI (c.f., sorting), % coarse, % sand, and % fines. Data were square-root transformed.
Mean Grain Size (microns)
100 1000
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I23I18I10 I4
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I27 I22I14
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I6I3
I29
I21I13I8I2
I28
I20I7
I1
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B12
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E5E8E11E14E17
E20E23E25E26
B8 B11
E1E7
E19B10
E3
E9E15E21 B13
Figure 9. Concentrations of total organic carbon (TOC) plotted as a function of mean grain size (1000 microns=1mm) for the benthic monitoring stations of the PLOO and SBOO.
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LA-4
LA-5
0 9 184.5 Kilometers
Figure 10. Map showing locations of benthic monitoring stations associated with the Pt. Loma (circles) and South Bay (stars) monitoring program.
B11
B8
E19E7
E1
B12B9
E26E25E23 E20
E14
E17E11
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E2
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E21E15E9
E3
Stress: 0.01
Figure 11. Plot of MDS results for analysis of organics in sediments. Data are from 2001.
Figure 12. Map indicating sediment transport in the Silver Strand Littoral Cell (from Inman, 1976). Zones of sediment accretion and erosion are indicated. Bathymetric units are feet.
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0 4 82 Kilometers
SEDsAll EventsCu
7.000000 - 8.000000
8.000001 - 9.000000
9.000001 - 10.000000
10.000001 - 12.000000
12.000001 - 15.000000
Figure 13. Concentrations of copper in sediment samples (ppm). Data are from 2001.
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0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09
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Figure 14. Relationship of total organic carbon and total nitrogen from samples collected as part of the Pt. Loma and South Bay Ocean outfalls. South Bay stations are ‘I’ stations and Pt. Loma stations are ‘B’ and ‘E’. Values are means of 2001 data.
Figure 15. Backscatter image showing spatial distribution of dredge disposal mounds (outlined in red). Dark circle with concentric lighter circle is the LA-5 dredge disposal site. The Pt. Loma Ocean Outfall is clearly visible. Survey from Gardner et al., 1998).
Figure 16. Map of San Diego indicating locations where mussels were outplanted in cages on moorings near the surface and bottom (see text for description of sites). The open circle indicates the site within the mouth of San Diego Bay where the mooring was lost. The red circle indicates the location of the ‘hot spot’ where concentrations of some contaminants were elevated (see text).
Figure 17. Results of MDS analysis. Analytes used in the analysis included organics, heavy metals, and PCB’s in mussel tissue. A site near the Scripps pier was used as a reference site. All samples at all depths, except for the reference spot and the bottom sample near the mouth of the San Diego Bay (indicated by red circle in Fig. 15 and by “PL2_8m” in this figure), clustered closely together. A stress level of zero indicates that the results are unambiguous.
Scripps
PL1_3mPL1_8mPL2_3m
PL2_8m
PL3_8mPL3_12m
Stress: <0.001