Upload
dophuc
View
215
Download
1
Embed Size (px)
Citation preview
Karpov 81
0 5000 10000 15000 20000
Biota
Hardpan
Rock Gravel Matrix
Rock Sand Matrix
Sand
Sediment
Turf
Number of Positions
Rock Boulder RockSand 1
RockSand 2 RockSand 3 Sand
Biota
29%
0%
66%
5% 0%
Hardpan
8% 0%
40%
10%7%
35%
Rock Gravel Matrix
13%
13%
31%
18%4%
21%
Rock Sand Matrix
3% 0%
71%
26%
Sand
21%
4%
14%
11%22%
28%
Sediment
0%4% 4%14%
78%
Turf
58%
10%
7%
13%
9% 3%
Rock Boulder RockSand 1
RockSand 2 RockSand 3 Sand
Figure 15. Histogram comparison of ROV observed primary substrates determined from 33,605 dGPS
positions to “RoxAnn” seabed classification. Pie charts represent the percentage of ROV modified
primary substrate type to each “RoxAnn” substrate classification.
Karpov 82
Figure 16. All ROV transects and SCUBA transects performed at PGER with transect code number superimposed over
grayscale sidescan sonar mosaic image. Darker gray indicates stronger sonar return and harder substrate.
Karpov 83
25
0 10 20 30 40 50 Meters
N
2 m bathymetry contours
Modified Primary Substrate
Rock
RockSand1
RockSand2
RockSand3
Sand
Video segment with prominentrock feature classified
as high relief rock substrate
Distance betweenobserved feature and
mapped feature is 63 meters
Direction ofROV movement
Large Rock
Figure 17. Displacement error observed between ROV positions and sidescan sonar image. Colored bars represent the ROV usable substrate segments classified by modified primary substrate type. Red bar represents the potential displacement (63 m) from an object (large rock) that can be identified from both information sources.
Karpov 84
0 100 200 300 400 Meters
25
29
37
30
36
38
31
PGER Boundary
2 m bathymetry contours
Bathymetry
10m
20m
30m
40m
50m
Relief (meters)
< 1
1 - 3
> 3
Modified Primary Substrate
Rock
RockSand1
RockSand2
RockSand3
Boulder
Sand
Sand Grain Texture
fine
medium
coarse
Substrate Classification
boulder
boulder field
coarse matrix
coarse sediment
fine matrix
fine sediment
rock outcrop
sediment ripples
unknown reef
Figure 18. ROV based modified primary substrate classifications overlaid on bathymetry and sidescan sonar mosaic interpretation of substrate classifications for the northern portion of PGER. ROV transect lines include segment information on substrate type (inside portion of line), relief (middle portion of line) and sand grain texture (outside portion of line).
Karpov 85
0 100 200 300 400 Meters
29
31
26
25
Sand
Boulder
RockSand3
RockSand2
RockSand1
Rock
Modified Primary Substrate
> 3
1 - 3
< 1
Relief (meters)
50m
40m
30m
20m
10m
Bathymetry
2 m bathymetry contours
PGER Boundary
Sand Grain Texture
fine
medium
coarse
Substrate Classification
boulder
boulder field
coarse sediment
fine matrix
fine sediment
rock outcrop
sediment ripples
unknown reef
Figure 19. ROV based modified primary substrate classifications overlaid on bathymetry and sidescan sonar
mosaic interpretation of substrate classifications for the central and southern portion of PGER. ROV transect
lines include segment information on substrate type (inside portion of line), relief (middle portion of line) and
sand grain texture (outside portion of line).
Karpov 86
0.00 0.01 0.02 0.03 0.04
Distances
Rock
Boulder
Rock Sand 1
Rock Sand 2
Rock Sand 3
Sand
Figure 20. Dendrogram of hierarchical cluster analysis of modified
primary substrates using the weighted fish densities of the nine most
abundant species (columns). Distinct clusters are represented by
different colored branches.
Karpov 87
0.00 0.01 0.02 0.03 0.04 0.05 0.06
Distances
Hexagrammos
decagrammus
Ophiodon elongatus
Pleuronectiformes
Juvenile Sebastes
Sebastes caurinus
Sebastes maliger
Sebastes melanops
Sebastes mystinus
Sebastes pinniger
Figure 21. Dendrogram of hierarchical cluster analysis of weighted densities of the
nine most abundant fish species by modified primary substrates (rows). Distinct
clusters are represented by different colored branches.
Karpov 88
Juvenile Sebastes
Sebastes mystinus
Pleuronectiformes
Ophiodon elongatus
Sebastes caurinus
Sebastes maliger
Sebastes melanops
Hexagrammos
decagrammus
Sebastes pinniger
0.000.020.040.060.080.100.12
RockBoulder
Rock S
and 1
Rock S
and 2
Rock S
and 3
Sand
Figure 22. Permuted data matrix of hierarchical cluster analyses of weighted densities of
the nine most abundant fish species by modified primary substrates (matrix, both columns
and rows, simultaneously). Distinct clusters in dendrograms are represented by different
colored branches. The number of cutpoints was determined by an algorithm in the clustering
program (SYSTAT 2000).