Post on 20-Aug-2020
Figu
re 1
. Lo
catio
n of
regi
ons w
ithin
no
rther
n an
d so
uthe
rn N
aple
s Bay
whe
re
side
-sca
n so
nar t
rack
s was
com
plet
ed.
20
Figu
re 2
. Lo
catio
n of
7 C
HIR
P pr
ofile
s lin
es w
ithin
nor
ther
n N
aple
s Bay
. Th
ese
prof
iles
over
lap
with
the
regi
on c
over
ed b
y th
e si
de-s
can
sona
r sur
vey.
21
Figu
re 3
. O
ne lo
ng C
HIR
P pr
ofile
(lin
e 9)
was
com
plet
ed in
sout
hern
Nap
les B
ay a
nd ru
ns
dow
n th
e ce
nter
of t
he si
de-s
can
sona
r sw
ath.
22
Figu
re 4
. A
eria
l vie
w o
f the
Ten
Tho
usan
d Is
land
s sho
win
g th
e 4
subr
egio
ns in
clud
ed in
this
st
udy:
Bla
ckw
ater
Bay
, Fak
a U
nion
Bay
, the
out
er c
oast
al m
argi
n of
Bla
ckw
ater
est
uary
, and
th
e ou
ter c
oast
al m
argi
n of
Fak
a U
nion
est
uary
.
23
Figu
re 5
. Lo
catio
ns o
f sid
e-sc
an so
nar
surv
eyed
regi
ons i
n th
e B
lack
wat
er
estu
ary
of th
e Te
n Th
ousa
nd Is
land
s: th
e in
ner r
egio
n of
Bla
ckw
ater
Bay
, whe
re
oyst
er re
ef d
evel
opm
ent p
redo
min
ates
, an
d th
e ou
ter c
oast
al m
argi
n, w
here
ve
rmet
iform
gas
tropo
d re
efs o
ccur
. Th
e lo
ng sh
allo
w st
ruct
ure
runn
ing
para
llel
and
east
of t
he o
uter
coa
stal
side
-sca
n so
nar s
wat
h (w
hich
cov
ers a
reef
s) is
a
seco
nd g
astro
pod
reef
.
24
Figu
re 6
. Th
ree
CH
IRP
lines
pro
filed
in B
lack
wat
er B
ay.
25
Figu
re 7
. Lo
catio
ns o
f si
de-s
can
sona
r sur
veye
d re
gion
s in
the
Faka
Uni
on
estu
ary
of th
e Te
n Th
ousa
nd Is
land
s: th
e in
ner r
egio
n of
Fak
a U
nion
Bay
, whe
re o
yste
r re
ef d
evel
opm
ent
pred
omin
ates
aro
und
its
perim
eter
, and
the
oute
r co
asta
l mar
gin,
whe
re
verm
etifo
rm g
astro
pod
reef
s occ
ur.
26
Figu
re 8
. Si
x C
HIR
P lin
es p
rofil
ed a
cros
s Fak
a U
nion
Bay
.
27
Figu
re 9
. Si
de-s
can
sona
r res
ults
for F
aka
Uni
on B
ay sh
owin
g 4
subs
trate
type
s: sa
ndy
mud
m
atrix
, SA
V-c
over
ed b
otto
m, i
sola
ted
oyst
er re
efs,
and
frin
ging
oys
ter r
eefs
.
28
Figu
re 1
0. S
ide-
scan
sona
r res
ults
for B
lack
wat
er B
ay sh
owin
g 2
subs
trate
type
s:
frin
ging
oys
ter r
eefs
and
sand
y m
ud b
otto
ms (
porti
ons o
f sw
aths
not
hig
hlig
hted
in
gree
n).
29
Figu
re 1
1. S
ide-
scan
sona
r res
ults
for t
he o
uter
coa
stal
mar
gin
of th
e B
lack
wat
er e
stua
ry
of v
erm
etifo
rm g
astro
pod
reef
subs
trate
. Th
e re
ef su
rfac
e is
com
pose
d of
pat
ches
of h
igh
subs
trate
with
shal
low
relie
f, in
ters
pers
ed w
ith sa
nd-a
nd g
rave
l-ric
h ar
eas.
Thi
s cre
ates
th
e pa
tchy
app
eara
nce
of th
e ac
oust
ic re
flect
ors.
30
Figu
re 1
2. S
ame
verm
etifo
rm g
astro
pod
reef
subs
trate
but
from
out
er c
oast
of F
aka
Uni
on
estu
ary.
31
Figu
re 1
3. M
ottle
d pa
ttern
seen
with
in th
e si
de-s
can
sona
r sig
nal i
ndic
ativ
e of
su
bmer
ged
aqua
tic v
eget
atio
n (S
AV
) tha
t cou
ld g
ener
ated
by
sea
gras
ses o
r ben
thic
al
gae.
Als
o pr
esen
t are
boa
t pro
pelle
r sca
rs a
cros
s thi
s hab
itat.
Imag
e m
id-li
ne
repr
esen
ts th
e to
wed
sona
r; th
e le
ft an
d rig
ht h
alve
s of t
he im
age
repr
esen
t the
por
t and
st
arbo
ard
side
s, re
spec
tivel
y, o
f the
sona
r sw
ath.
32
Figu
re 1
4. S
imila
rly fo
rmat
ted
imag
e as
seen
in F
igur
e 13
. St
arbo
ard
pane
l sho
ws
side
-sca
n so
nar i
mag
e of
a su
btid
al o
yste
r ree
f fro
m n
orth
ern
Nap
les B
ay.
33
Figu
re 1
5. C
HIR
P lin
e 4
runn
ing
para
llel t
o an
d th
roug
h B
lack
wat
er R
iver
’s m
outh
. Le
ngth
hig
hlig
hted
in g
reen
trav
erse
s mod
ern
fore
set b
eds o
f the
rive
r’s d
elta
.
34
100m
5ms
3.75
m
Blac
kwat
erLi
ne 4
Rec
ent R
iver
Mou
th D
elta
with
For
eset
Beds
in N
orth
ern
Bla
ckw
ater
Bay
and
mou
th o
f Bla
ckw
ater
Riv
er
Figu
re 1
6. C
HIR
P pr
ofile
vie
w o
f the
subs
urfa
ce u
nder
line
4 in
Bla
ckw
ater
Bay
th
roug
h th
e de
lta’s
fore
set b
eds.
Red
line
s hig
hlig
ht th
e st
ruct
ural
dip
of t
hose
fore
set
beds
. N
ote
that
fore
set d
ip a
ngle
is v
ertic
ally
exa
gger
ated
.
35
Figu
re 1
7. C
HIR
P lin
e 2
runn
ing
thro
ugh
Bla
ckw
ater
Bay
. Li
ne tr
aver
ses a
n an
cien
t riv
er
mou
th’s
del
ta (h
ighl
ight
ed in
red)
. (F
igur
e 18
show
s the
fore
set b
eds o
f thi
s anc
ient
stru
ctur
e in
the
subs
urfa
ce.)
Not
e th
e po
sitio
n an
d te
rmin
atio
n of
the
old,
now
inac
tive,
Bla
ckw
ater
ch
anne
l jus
t nor
th o
f the
red
line
segm
ent.
36
50m
5ms
3.75
m
Anc
ient
Riv
er M
outh
in S
outh
east
ern
Bla
ckw
ater
Bay
Blac
kwat
erLi
ne 2
Figu
re 1
8. C
HIR
P pr
ofile
und
er th
e an
cien
t riv
er m
outh
of l
ine
2. T
he re
d lin
es
depi
ct th
e ol
d fo
rese
t bed
s. A
ngle
is v
ertic
ally
exa
gger
ated
.
37
Figu
re 1
9. C
HIR
P lin
e 4
runn
ing
acro
ss F
aka
Uni
on B
ay.
The
flat s
ubst
rate
of t
he b
ay’s
in
terio
r mim
ics a
feat
urel
ess s
truct
ure
in th
e su
bsur
face
.
38
5ms
3.75
m
100m
Flat
, fea
ture
less
bot
tom
in c
entra
l Fak
aU
nion
Bay
Faka
Uni
on B
ay L
ine
4
Figu
re 2
0. C
HIR
P pr
ofile
vie
w u
nder
line
4 in
Fak
a U
nion
Bay
. N
ote
that
the
subs
urfa
ce la
cks v
isib
le st
ruct
ures
, ind
icat
ing
that
no
shal
low
ly b
urie
d oy
ster
re
efs e
xist
und
er th
is re
gion
of t
he b
ay’s
inte
rior.
39
Figu
re 2
1. C
HIR
P lin
e 5
runn
ing
thro
ugh
Faka
Uni
on B
ay’s
inte
rior.
As t
he fr
ingi
ng re
efs
are
appr
oach
ed a
long
the
north
ern
term
inus
of t
he li
ne, b
urie
d oy
ster
reef
s are
enc
ount
ered
.
40
100m
5ms
3.75
m
Faka
Uni
on B
ay L
ine
5
Pre
sent
Oys
ter R
eefs
Ove
rlyin
g B
urie
d R
eef i
n N
orth
ern
Faka
Uni
on B
ay
Con
trast
in S
edim
ent S
urfa
ce T
ypes
is re
cogn
ized
by
diffe
renc
e in
the
refle
ctan
ce o
f sed
imen
t su
rface
: O
n le
ft th
e se
dim
ent i
s pr
obab
ly s
andy
/mud
–m
uddy
/san
d, w
here
the
right
is h
ard
sand
s,
shel
ls, a
nd o
yste
r ree
fs.
Bel
ow th
e ha
rd s
urfa
ce re
flect
ors
(on
the
right
) you
can
see
bur
ied
reef
.
Pre
sent
Day
oys
ter r
eef
Pas
t Oys
ter r
eef
Figu
re 2
2. C
HIR
P pr
ofile
und
er li
ne 5
of F
aka
Uni
on B
ay.
Yel
low
out
lines
pre
sent
-da
y oy
ster
reef
s; re
d ou
tline
s ree
fs b
urie
d in
the
subs
urfa
ce.
41
Figu
re 2
3. C
lose
-up
imag
e of
th
e si
de-s
can
sona
r res
ults
fr
om th
e no
rther
n su
rvey
are
a of
Nap
les B
ay.
Num
erou
s na
tura
l and
ant
hrop
ogen
ic
subs
trate
feat
ures
are
in
dica
ted.
42
Figu
re 2
4. S
ide-
scan
so
nar r
esul
ts fo
r the
so
uthe
rn a
rea
of
Nap
les B
ay.
A
num
ber o
f sub
stra
te
type
s is i
ndic
ated
.
43
5ms
3.75
m
200m
Nap
les
Bay
Line
3
Ante
cede
nt g
eolo
gy 1
-3m
bel
ow p
rese
nt s
edim
ent
surfa
ce.
Pos
sibl
y ol
d ra
vine
men
tsur
face
dur
ing
a lo
wer
sta
nd in
sea
leve
l.
Figu
re 2
5. C
HIR
P pr
ofile
und
er p
ortio
n of
line
3 in
nor
ther
n N
aple
s Bay
. R
ecen
t se
dim
ents
, tho
se w
ithin
thic
knes
ses o
f 1 m
, are
rela
tivel
y fla
t-lyi
ng.
The
deep
er su
bsur
face
di
spla
ys a
n er
osio
nal r
avin
emen
t sur
face
that
was
pro
babl
y cr
eate
d du
ring
a lo
wer
stan
d in
se
a le
vel.
44
58.5
m
5ms
3.75
m
Sedi
men
t Fill
with
in th
e ch
anne
l run
ning
alo
ng th
e w
este
rn m
argi
n of
Nor
th N
aple
s B
ay
Nap
les
Bay
Line
5
Figu
re 2
6. C
HIR
P pr
ofile
resu
lts fo
r por
tion
of li
ne 5
in n
orth
ern
Nap
les B
ay.
Cha
nnel
runn
ing
alon
g w
este
rn e
dge
of su
rvey
are
a sh
owin
g de
ep c
ut a
nd c
hann
el-
infil
l sed
imen
ts.
45