Copyright
J. H Parker.

1985 monitoring surveys at the central Long Island Sound disposal site : an assessment of impacts from disposal and Hurricane Gloria online

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SHELL = SHELL LAG DEPOSITS

-# = ESTIMATE OF EROSION BASED

ON EXPOSED WORM TUBES (CM)

NO VALUE INDICATES THE ABSENCE OF THESE FEATURES.



-0.41
SHELL

#
200S



Figure 3-18 A post-storm benthic "process" map showing the
distribution of erosional and depositional features
at STNH-N.






Figure 3-19 A REMOTS* image from 200N showing shell lag
deposits and an exposed polychaete tube indicative
of surface erosion. Scale = IX.



STNH-N



2.08
200N



2.21



25N



2.33 1.18 0.74 0.41 2.72 2.88

• • • • • •

200W 25W CTR 25E 200E 600E



1.30



25S



2.10



200S



Figure 3-2 The mapped distribution of post-storm redox
potential discontinuity (RPD) depths at STNH-N.



STNH-N



lll-l



200N



25N



ll-lll I lll-l I lll-l l->ll(2},ll

• # • • • •

200W 25W CTR 25E 200E 600E



KEY 25S

= AZOIC

1 = STAGE 1

l-^l : STAGE 1 GOING TO STAGE 2 '

II = STAGE 2 ^
11-^11 = STAGE 2 GOING TO STAGE 3 200S

III = STAGE 3

111-1 = STAGE 1 ONSTAGE 3
lll-ll = STAGE 2 ON STAGE 3



Figure 3-21 The mapped distribution of post-storm infaunal
successional stages at STNH-N.



STNH-N



8

200N



8

25N



8,6(2)



200W



26W



CTR



25E



200E



600E



KEY



# = ORGANISM-SEDIMENT INDEX VALUE FOUND
AT THAT STATION

(#) = REPLICATES SHOWING PRECEEDING VALUE



25S



200S



Figure 3-22 The mapped distribution of post-storm
Organism-Sediment Indices (OSI) at STNH-N.



METHANE

STNH - S •



600N



P*
RS



400N



RS
15.87 8.02 P*



200NW 200N 200NE



RS P* p*

RS 8.00 RS RS



P* RS



600W 400W 200W CTR 200E 400E 600E



RS
P* 10.50



200SW 200S 200SE



KEY



400S

* = DREDGED MATERIAL THICKNESS (CM)

P* = DREDGED MATERIAL THICKER THAN REMOTS
WINDOW PENETRATION.(>20CM)

RS = REDUCED SEDIMENT NEAR THE SEDIMENT -

WATER INTERFACE IN AT LEAST ONE 9

REPLICATE IMAGE. 600S

NO VALUE INDICATES THE ABSENCE OF THESE FEATURES.



Figure 3-23 A map showing the apparent distribution and
thickness of dredged material, averaged by station
at the STNH-S site in August 1985.



STNH-S



5. STMt

T ^ ftUCUST

L



■—I — I — h

e .4 .8 1.2 1.6 2.8 2.4 2.8 3.2 3.6



BOUNDARY ROUGHNESS (CN)



STHH-S
AUGUST 1985




8 123456789 18
HEAN RPD DEPTH (CM)



STNH-S
AUGUST 1985




81234S67ft9 18 11
ORCANISn-SEDIHENT INDEX



Figure 3-24 The frequency distributions of boundary roughness,
redox potential discontinuity (RPD) depths, and
Organism-Sediment Index (OSI) values for August
1985 at STNH-S.



3.89

STNH - S •

BOON



4.39



400N



1.39 3.77 7.06

# # •

200NW 200N 200NE



3.63 3 95 3.59 4.87 4.76 2.75

• •••••

400W 200W CTR 200E 400E 600E



1 74 ^-^^ 8.58

• • •

200SW 200S 200SE

3.83
400S

4.65
600S

Figure 3-25 The mapped average apparent redox potential
discontinuity (RPD) depth values at each station
in the August suirvey at STNH-S.



STNH - S



1,111,111-1

#
600N



l(2),lll-l



400N



200NW



111-1(2), I
200N



200NE



l(2),lll-l



1(3}



1(3)



1(3)



lll-l(2),l



-1(2),



l(2),lll-l



600W



400W



200W



CTR



200E



400E



600E



1(3)



200SW



200S



200SE



KEY



= AZOIC

1 = STAGE 1

l-ai = STAGE 1 GOING TO STAGE 2

II: STAGE 2

ll^ll = STAGE 2 GOING TO STAGE 3

111 = STAGE 3

lll-l = STAGE 1 ON STAGE 3

111-11 = STAGE 2 ON STAGE 3



-l(2),l



400S



111-1,1(2)



600S



Figure 3-2 6 The mapped distribution of successional stages for
all replicates DIMENT NEAR THE SEDIMENT -

WATER INTERFACE IN AT LEAST ONE

REPLICATE IMAGE

MO VALUE INDICATES THE ABSENCE OF THESE FEATURES.



SOS



RS
MC



200S



Figure 3-63 A post-storm benthic "process" map showing the
distribution of erosional and depositional
features .




Figure 3-64 A post-storm REMOTS® image from station 200N
showing a smooth bottom colonized by a Stage I
assemblage. Scale = IX.



MQR



2.51



200N



1.83
SON



0.88 2.82 3.10 2.59 2.57 2.78

• • • • • • •

1000W 200W SOW CTR SOE 200E 1000E



3.92



SOS



2.80



200S



Figure 3-65 The mapped distribution of post-storm redox
potential discontinuity (RPD) depths (cm) at MQR.
A REMOTS® photo was not successfully obtained at
lOOOE.



MQR



200N



SON



I

1000W



200W



|->ll



50W



CTR



60E



lll-l



200E



1000E



KEY

= AZOIC

I = STAGE 1

HI = STAGE 1 GOING TO STAGE 2

II: STAGE 2

il-JIII = STAGE 2 GOING TO STAGE 3

111 = STAGE 3

111-1 = STAGE 1 ONSTAGE 3

lll-ll = STAGE 2 ON STAGE 3

IND = INDETERMINATE



SOS



200S



Figure 3-66 The mapped distribution of post-storm infaunal
successional stages at MQR. A REMOTS® photo was
not successfully obtained at lOOOE.



MQR



3

200N



4

50N



I'lOOOW



200W



SOW



CTR



50E



200E



1000E



KEY



50S



IND = INDETERMINATE ORGANISM-SEDIMENT
INDEX

# = ORGANISM-SEDIMENT INDEX VALUE FOUND
AT THAT STATION

(#) : REPLICATES SHOWING PRECEEDING VALUE



200S



Figure 3-67 The mapped distribution of post-storm
Organism-Sediment Indices (OSI) at MQR. A REMOTS®
photo was not successfully obtained at lOOOE.




Figure 3-68 A REMOTS* image from August, station 200W, showing
reduced sediment patches near the interface.



NORWALK



AUGUST 1985




.8 1.2 1.6 Z.e 2.4
BOUNDARY ROUGHNESS (CH)



AUGUST 1985




23456789
HEAH RPD DEPTH (CH>



NORUALK
AUGUST 1985



I ¥ PW¥ -¥




6123456789 le 11
ORGANISn-SEOIdENT INDEX



Figure 3-69 The frequency distribution of boundary
roughness, redox potential discontinuity (RPD)
depths, and Organism-Sediment Index (OSI) values
for August 1985 at Norwalk.



NORWALK
SITE



6.33



600N



6.44

#
400N



6.43



6.66



5.24



200NW



200N



200NE



3.44



600W



4.80
400W



3.26

200W



4.23



CTR



2.05



200E



6.51



400E



2.41



600E



6.32
200SW



4.98



200S



5.15



200SE



4.46



400S



2.14



600S



Figure 3-70 The mapped average apparent redox potential
discontinuity (RPD) depth values at each station
in the August survey at Norwalk.



NORWALK
SITE



-1(3)



600N



111-1(3)
400N



lll-l


l(2),lll-l





#


200NW


200N



200NE



l(2),lll-l



600W



1,111-1(2)



400W



1,111-1(2)



200W



1,111-1(2)


l(2),lll-l


1(3)


111-1(3)


#





#





CTR


200E


400E


600E



lll-l



1(3)



200SW



KEY



= AZOIC

1 = STAGE 1

l-ai = STAGE 1 GOING TO STAGE 2

II = STAGE 2

11-5111 = STAGE 2 GOING TO STAGE 3

III = STAGE 3

111-1 = STAGE 1 ON STAGE 3
111-11 = STAGE 2 ON STAGE 3



200S



l(2),lll-l

#

400S



1(3)

#
600S



200SE



Figure 3-71 The mapped distribution of successional stages for
all replicates in the August survey at Norwalk.



NORWALK
SITE



11(3)



600N



11(3)



400N



11


11,7(2)








200NW


200N



11



200NE



11,4,7



11,7,8



11,5,8



11(2), 7



7(2), 3



6,7(2)



11,8,7



600W



400W



200W



CTR



200E



400E



600E



11



7(3)



200SW



200S



200SE



KEY



# = ORGANISM-SEDIMENT INDEX VALUE FOUND
AT THAT STATION

(#) = REPLICATES SHOWING PRECEEDING VALUE



7(2), 10



400S



7,4,2



600S



Figure 3-72 The mapped distribution of Organism- Sediment
Indices (OSI) for all replicates in the August
survey at Norwalk.



NEW HAVEN 74



HEM HAUEN 74
AUGUST 1985




8 1.21.6 2.6 2.4 2.8 3.2 3.6

BOUNDARY ROUGHNESS (CH)



NEM HAUEN 74
AUGUST 1985




1 23456789 IB
HEAH RPD DEPTH (CH)



NEW HAUEH 74
AUGUST 1985




123 4567 89 19 11
ORCANISn-SEDIHENT INDEX



Figure 3-73 The frequency distribution of boundary roughness,
redox potential discontinuity (RPD) depths, and
Organism-Sediment Index (OSI) values for August,
1985 at NH-74.



NEW HAVEN 74 •"



SITE



600N



3.70



400N



3.24 3.13 4.43

• # •

200NW 200N 200NE



2.69 3.20 88 4.34 4.43 5.01 3.25

• • • • • • •

600W 400W 200W CTR 200E 400E 600E



6.51



6.37 5.08

• # •

200SW 200S 200SE



3.76



400S



3.74
600S

Figure 3-74 The mapped average apparent redox potential
discontinuity (RPD) depth values (cm) at each
station in the August survey at NH-74.



NEW HAVEN 74
SITE



1,111-1(2)
600N



1,111-1(2)
400N



200NW



1,111-1(2)



200N



lll-l

m

200NE



1,111-1
600W



1(3}
400W



1(3)

200W



111-1(3)



CTR



1(3)



200E



,11-1(2)



400E



1,111-1(2)



600E



lll-l



l(2),lll-l



200$W



KEY



= AZOIC

1 = STAGE 1

m - STAGE 1 GOING TO STAGE 2

II = STAGE 2

ll->lll = STAGE 2 GOING TO STAGE 3

III = STAGE 3

111-1 = STAGE 1 ONSTAGE 3
111-11 = STAGE 2 ON STAGE 3



200S



1,111-1(2)



400S



1,111-1(2)



600S



200SE



Figure 3-75 The mapped distribution of successional stages for
all replicates in the August survey at NH-74.



NEW HAVEN 74
SITE



7,8,9
600N



5,11(2)

400N



10



200NW



4,9,11
200N



1 1



200NE



5,10



4,6,7



2,3,(2)



11(3)



6,7,(2) 7(2),8



600W



400W



200W



CTR



200E



400E



11



7(2),11



200SW



200S



200SE



KEY



# = ORGANISM-SEDIMENT INDEX VALUE FOUND
AT THAT STATION

(#) = REPLICATES SHOWING PRECEEDING VALUE



6,11(2)
400S



7,9,10



600S



Figure 3-76 The mapped distribution of Organism- Sediment
Indices (OSI) for all replicates in the August
survey at NH-74.



NEW HAVEN 83



NEU HAUEN 83
AUCUSl 1965




BOUNDARY ROUGHNESS (CM)



NEM HAUEN 83
AUGUST 1985




123456789
MEAN RPD DEPTH <CM)



NH-83
AUGUST 1985




123436789 IB 11
ORCANlSM-SEDinENT INDEX



Figure 3-77 The frequency distribution of boundary roughness,
redox potential discontinuity (RPD) depths, and
Organism-Sediment Index (OSI) values for the August
survey at NH-83.



NEW HAVEN 83 '•



SITE



2.67


2.50


3.10











600W


400W


200W



2.12



600N



2.17



400N



2.70 3.78

# •

200NW 200NE



, g.| 3.89 2.51

• • •

CTR 200E 400E



4.26 2.69

# •



200SW 200S 200SE



1.93



400S



3.99
600S



Figure 3-78 The mapped average apparent redox potential
discontinuity (RPD) depth values (cm) for all
replicates in the August survey at NH-83.



NEW HAVEN 83 '•'

SITE



= AZOIC



600N



l,h>ll



400N



200NW 200NE



l-l I 1,111-1 1,111-1



l,|->ll I

• • • • • •

600W 400W 200W CTR 200E 400E



I I '"-'

• • •

200SW 200S 200SE

KEY



I

1= STAGE 1 400S



1-5(1 = STAGE 1 GOING TO STAGE 2

II = STAGE 2

11-^11 = STAGE 2 GOING TO STAGE 3

III = STAGE 3 MiH
lll-l = STAGE 1 ONSTAGE 3
lll-ll : STAGE 2 ON STAGE 3
IND = INDETERMINATE



600S



Figure 3-79 The mapped distribution of infaunal successional
stages for all replicates in the August survey at
NH-83.



NEW HAVEN 83
SITE



6,4,10



600N



7,3,4



400N



11



200NW



200NE



3,4,8



7,5,3



11,6,4



5,3



11,7,10



4,6,9



600W



400W



200W



CTR



200E



400E



7,5



2aosw



200S



200SE



KEY



IND = INDETERMINATE ORGANISM-SEDIMENT
INDEX

* = ORGANISM-SEDIMENT INDEX VALUE FOUND
AT THAT STATION

(») = REPLICATES SHOWING PRECEEDING VALUE



3,5,4

#

400S



7,11(2)7,1



600S



Figure 3-80 The mapped distribution of Organism-Sediment Index
(OSI) values for all replicates in the August
survey at NH-83.



SE-CLIS




SE-CLIS
AUGUST 1985



H h



.8


12 16 2 8 2.^2


.8 3


2


3


e


BOUNDARY ROUGHNESS


(CM)










SE-CLIS












AUGUST 1985











I



lib.



1 23456789 U
MEAN RPD DEPTH (CM>



SE-CLIS
AUGUST 1985



u



23456789 len

organism-seoihent index



Figure 3-81 The frequency distribution of boundary roughness,
redox potential discontinuity (RPD) depths, and
Organism-Sediment Index (OSI) values for the August
survey at CLIS-SE.






£•



LJJ


7.42



N/300W


6.73



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CLIS TRANSECT



T-2



2-l,MC,SHELL
28'



T-3



2-1, SHELL
30"



T-4



2-l,MC,SHELL
35"



T-6



3 -2, MC, SHELL
46'



T-7



KEY

BF = BEDFORM

MC = MUD CLAST
SHELL = SHELL LAG DEPOSITS

-+ = ESTIMATE OF EROSION

BASED ON EXPOSED WORM
TUBES. (<cm)

RS = REDUCED SEDIMENT
NEAR THE WATER-
INTERFACE IN AT
LEAST ONE REPLICATE
IMAGE
S/M = SAND OVER MUD



4-3, MC
48'

T-9

>4,MC
53"



T-10

>4,MC,SHELL
64'



NO VALUE INDICATES AN ABSENCE
OF THESE FEATURES.



Figure 3-85



A grain-size and benthic "process" map of the
post-storm CLIS Transect. Major modal grain-size
in phi units are indicated for each station.




Figure 3-86 A-B



Two post-storm REMOTS® images from stations T-3 and
T-6 respectively, showing shell lag deposits and
mud clasts indicative of bottom disturbance. Scale
= IX.





Figure 3-86B Scale = IX,



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27 SEPT.1985



13:15 EDST




0.3-



0.2-



0.1-



0.0-




14:15 EDST



0.0 0.1 0.2 0.3
Cycles per second



Figure 3-91 Spectral plot of near-bottom pressure at New London
Disposal Area, 27 September 1985.



0.3-



0.2-



0.1-



0.0-



16:15 EDST
27 SEPT. 1985






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0.3



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27 SEPT. 1985





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Figure 3-91 Continued,




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New Haven Harbor



, 2-14), Shell lag
•— 30'

2-l<j), Shell lag



9cm (rippled)




70'



80



CLIS REF
Negligible effect



Figure 4-1



Observed grain-size (in phi units) along REMOTS®
transect extending from New Haven Harbor entrance
to the CLIS-REFERENCE site.




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APPENDIX
Captions to Plates



FVP

1. An aggregation of foraging hermit crabs. This activity caused
erosion of fine surface sediments leaving only the coarser
sediment components.

2. A partially buried whelk moving through the sediment-water
interface. Note valve of the razor clam, a common prey
species of the whelk.

3. A juvenile rock crab with shelter excavated under a shell
fragment. All individuals were observed in softshell
condition. Note molt (exuviae) at shelter entrance.

4. A vertical burrow of the rock crab with exuviae at entrance.

5. The individual rock crab removed from the burrow in the
previous photograph.

6. Recent burrowing activity by a rock crab distributed anoxic
sediments on the surface outside the shelter entrance.

7. Juvenile 4-spot flounder were observed foraging normally on
the dredged material site.

8. A hermit crab leaving tracks on the sediment surface at the
periphery of the site.

9. An association of starfish and sand shrimp (bottom of
photograph, partially buried) . The shrimp would winnow
through sediments disturbed by the tube feet of the starfish.

CS-1

10. Hydroids fouling a clump of saltmarsh peat material.

11. Hydroid colony attached to a partially buried peat clump.

12. A winter flounder on the current sheltered side of a peat
clump.

13. Mud snails attracted to the mucous trail left by a whelk on
the surface of the dredged material.

CS-2

14. Remains of the molted exoskelton of a spider crab.



15. A juvenile windowpane flounder (approx. 6 cm length) on the
dredged material surface.



STNH-North

16. Mud snail tracks and polychaete fecal casts are typical
surface features.

17. The result of venting of sediments by mud snails burrowing
below the sediment-water interface.

18 . A razor clam with both valves still attached indicating recent
mortality.

19. Surficial sediments reworked by the foraging activities of
starfish and dense aggregations of hermit crabs.

20. Hydroids attached to shell hash material on and just under
the surface.



STNH-South

21. A burrowing anemone with tentacles extended. This species was
only observed at the STNH-South site during survey dives.

22. Close-up photograph of a snail burrow and degrading
polychaetes fecal casts.

23. A larger burrow, possibly excavated by a juvenile rock crab.

24. A juvenile cunner taking shelter near a hydroid colony.

25. Close-up of a hydroid colony.





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Online LibraryJ. H Parker1985 monitoring surveys at the central Long Island Sound disposal site : an assessment of impacts from disposal and Hurricane Gloria → online text (page 7 of 7)