google earth 29 aug 2017 impact of offshore directed
TRANSCRIPT
Impact of Offshore Directed Forcing
on Sediment Transport
and Structural Integrity at
Packery Channel, Corpus Christi
Texas
Google Earth 29 Aug 2017
Deidre D. WilliamsCoastal Research Scientist
Conrad Blucher Institute for Surveying and Science
Texas A&M University-Corpus Christi
Philip Blackmar PE
HDR Inc.
Philippe TissotAssociate Director, Research Scientist
Conrad Blucher Institute for Surveying and Science
Texas A&M University-Corpus Christi
ASPBA Texas Chapter Symposium
Harte Research Institute
TAMUCC
24 Apr 2018
Packery Channel
Location near Confluence of CC Bay and Upper Laguna Madre
Packery Channel
Fish Pass
Aransas Pass
Mustang
Island
North
Padre
Island
Newport Pass
Corpus Christi
Bay
Gulf
of
Mexico
Bob Hall Pier
Upper
Laguna
Madre
Mustang
Island
North Padre
Island
Gulf
of Mexico
2003
Emily
Opens
Channel
July 2005
Channel
Remains
Opens
July 2006
Channel
Remains
Open
1st Dredge2011/2012
2012/2013
Sand Plug
Facilitates
Construction
June 2005
Packery Channel:
A Brief History
Channel
Remains
Open
HarveyAug 2017
Oct 2017
Post-Harvey:
Location of Significant Damage
Requiring Maintenance
and/or Restoration Planning
Coastal Structures and
City Infrastructure
LegendBeach and Backshore
Pre-Harvey (July 2017): Regions of Shoaling
Lake
Padre
Inland
Channel
Segment
(South Reach 1)
Packery
Channel
County
Park
Inland
Channel
Segment
(North Reach 2)
Mustang
Island
Packery
Channel
Deposition Basin
Gulf
of Mexico
Entrance
ChannelNorth Padre
Island (NPI)
NPI
Seawall
Mollie Beattie
Coastal Habitat
Community
Newport
Pass
Upper Laguna
Madre Legend
Transient Shoal
Legend
Transient Shoal
Persistent Shoal
Google Imagery Jan 2017
9
Legend
pc_dogleggulf_3ft_NAVD88OPUS_March2012_ramp
Elevation
-31.57 - -31.5
-31.5 - -31
-31 - -30.5
-30.5 - -30
-30 - -29.5
-29.5 - -29
-29 - -28.5
-28.5 - -28
-28 - -27.5
-27.5 - -27
-27 - -26.5
-26.5 - -26
-26 - -25.5
-25.5 - -25
-25 - -24.5
-24.5 - -24
-24 - -23.5
-23.5 - -23
-23 - -22.5
-22.5 - -22
-22 - -21.5
-21.5 - -21
-21 - -20.5
-20.5 - -20
-20 - -19.5
-19.5 - -19
-19 - -18.5
-18.5 - -18
-18 - -17.5
-17.5 - -17
-17 - -16.5
-16.5 - -16
-16 - -15.5
-15.5 - -15
-15 - -14.5
-14.5 - -14
-14 - -13.5
-13.5 - -13
-13 - -12.5
-12.5 - -12
-12 - -11.5
-11.5 - -11
-11 - -10.5
-10.5 - -10
-10 - -9.5
-9.5 - -9
-9 - -8.5
-8.5 - -8
-8 - -7.5
-7.5 - -7
-7 - -6.5
-6.5 - -6
-6 - -5.5
-5.5 - -5
-5 - -4.5
-4.5 - -4
-4 - -3.5
-3.5 - -3
-3 - -2.5
-2.5 - -2
-2 - -1.5
-1.5 - -1
-1 - -0.5
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
Legend
pc_dogleggulf_3ft_NAVD88OPUS_March2012_ramp
Elevation
-31.57 - -31.5
-31.5 - -31
-31 - -30.5
-30.5 - -30
-30 - -29.5
-29.5 - -29
-29 - -28.5
-28.5 - -28
-28 - -27.5
-27.5 - -27
-27 - -26.5
-26.5 - -26
-26 - -25.5
-25.5 - -25
-25 - -24.5
-24.5 - -24
-24 - -23.5
-23.5 - -23
-23 - -22.5
-22.5 - -22
-22 - -21.5
-21.5 - -21
-21 - -20.5
-20.5 - -20
-20 - -19.5
-19.5 - -19
-19 - -18.5
-18.5 - -18
-18 - -17.5
-17.5 - -17
-17 - -16.5
-16.5 - -16
-16 - -15.5
-15.5 - -15
-15 - -14.5
-14.5 - -14
-14 - -13.5
-13.5 - -13
-13 - -12.5
-12.5 - -12
-12 - -11.5
-11.5 - -11
-11 - -10.5
-10.5 - -10
-10 - -9.5
-9.5 - -9
-9 - -8.5
-8.5 - -8
-8 - -7.5
-7.5 - -7
-7 - -6.5
-6.5 - -6
-6 - -5.5
-5.5 - -5
-5 - -4.5
-4.5 - -4
-4 - -3.5
-3.5 - -3
-3 - -2.5
-2.5 - -2
-2 - -1.5
-1.5 - -1
-1 - -0.5
- 32
-31
-30
-29
-28
-27
-26
-25
-24
-23
-22
-21
-20
-19
-18
-17
LegendDepth, ft (NAVD88)
Post-Harvey (Sep 2017): Change in Shoaling and Scour
Lake
Padre
Packery
Channel
County
ParkMustang
Island
Packery
Channel
Gulf
of Mexico
North Padre
Island (NPI)
Mollie Beattie
Coastal Habitat
Community
Newport
Pass
Legend
Transient Shoal
Legend
Transient Shoal
Persistent Shoal
Legend
Transient Shoal
Persistent Shoal
Scour
Image: CNSA 30 Aug 2017
9
Legend
pc_dogleggulf_3ft_NAVD88OPUS_March2012_ramp
Elevation
-31.57 - -31.5
-31.5 - -31
-31 - -30.5
-30.5 - -30
-30 - -29.5
-29.5 - -29
-29 - -28.5
-28.5 - -28
-28 - -27.5
-27.5 - -27
-27 - -26.5
-26.5 - -26
-26 - -25.5
-25.5 - -25
-25 - -24.5
-24.5 - -24
-24 - -23.5
-23.5 - -23
-23 - -22.5
-22.5 - -22
-22 - -21.5
-21.5 - -21
-21 - -20.5
-20.5 - -20
-20 - -19.5
-19.5 - -19
-19 - -18.5
-18.5 - -18
-18 - -17.5
-17.5 - -17
-17 - -16.5
-16.5 - -16
-16 - -15.5
-15.5 - -15
-15 - -14.5
-14.5 - -14
-14 - -13.5
-13.5 - -13
-13 - -12.5
-12.5 - -12
-12 - -11.5
-11.5 - -11
-11 - -10.5
-10.5 - -10
-10 - -9.5
-9.5 - -9
-9 - -8.5
-8.5 - -8
-8 - -7.5
-7.5 - -7
-7 - -6.5
-6.5 - -6
-6 - -5.5
-5.5 - -5
-5 - -4.5
-4.5 - -4
-4 - -3.5
-3.5 - -3
-3 - -2.5
-2.5 - -2
-2 - -1.5
-1.5 - -1
-1 - -0.5
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
Legend
pc_dogleggulf_3ft_NAVD88OPUS_March2012_ramp
Elevation
-31.57 - -31.5
-31.5 - -31
-31 - -30.5
-30.5 - -30
-30 - -29.5
-29.5 - -29
-29 - -28.5
-28.5 - -28
-28 - -27.5
-27.5 - -27
-27 - -26.5
-26.5 - -26
-26 - -25.5
-25.5 - -25
-25 - -24.5
-24.5 - -24
-24 - -23.5
-23.5 - -23
-23 - -22.5
-22.5 - -22
-22 - -21.5
-21.5 - -21
-21 - -20.5
-20.5 - -20
-20 - -19.5
-19.5 - -19
-19 - -18.5
-18.5 - -18
-18 - -17.5
-17.5 - -17
-17 - -16.5
-16.5 - -16
-16 - -15.5
-15.5 - -15
-15 - -14.5
-14.5 - -14
-14 - -13.5
-13.5 - -13
-13 - -12.5
-12.5 - -12
-12 - -11.5
-11.5 - -11
-11 - -10.5
-10.5 - -10
-10 - -9.5
-9.5 - -9
-9 - -8.5
-8.5 - -8
-8 - -7.5
-7.5 - -7
-7 - -6.5
-6.5 - -6
-6 - -5.5
-5.5 - -5
-5 - -4.5
-4.5 - -4
-4 - -3.5
-3.5 - -3
-3 - -2.5
-2.5 - -2
-2 - -1.5
-1.5 - -1
-1 - -0.5
- 32
-31
-30
-29
-28
-27
-26
-25
-24
-23
-22
-21
-20
-19
-18
-17
LegendDepth, ft (NAVD88)
Mollie
Beattie
Coastal Habitat
Community
Pre-IkePre-Harvey
Post-IkePost-Harvey
Net Sand Volume
Decreased by ≈ 30,000 cu yd
Shoaling and Scour in the Entrance Channel
Harvey VS Ike
Pre-Ike
Post-Ike
Net Sand Volume
Increased by ≈ 30,000 cu yd9
Le
ge
nd
pc_d
og
leg
gu
lf_3ft
_N
AV
D88O
PU
S_M
arc
h2
012_ra
mp
Ele
va
tio
n
-31
.57 -
-31
.5
-31
.5 -
-3
1
-31
- -
30.5
-30
.5 -
-3
0
-30
- -
29.5
-29
.5 -
-2
9
-29
- -
28.5
-28
.5 -
-2
8
-28
- -
27.5
-27
.5 -
-2
7
-27
- -
26.5
-26
.5 -
-2
6
-26
- -
25.5
-25
.5 -
-2
5
-25
- -
24.5
-24
.5 -
-2
4
-24
- -
23.5
-23
.5 -
-2
3
-23
- -
22.5
-22
.5 -
-2
2
-22
- -
21.5
-21
.5 -
-2
1
-21
- -
20.5
-20
.5 -
-2
0
-20
- -
19.5
-19
.5 -
-1
9
-19
- -
18.5
-18
.5 -
-1
8
-18
- -
17.5
-17
.5 -
-1
7
-17
- -
16.5
-16
.5 -
-1
6
-16
- -
15.5
-15
.5 -
-1
5
-15
- -
14.5
-14
.5 -
-1
4
-14
- -
13.5
-13
.5 -
-1
3
-13
- -
12.5
-12
.5 -
-1
2
-12
- -
11
.5
-11.5
- -
11
-11 -
-10
.5
-10
.5 -
-1
0
-10
- -
9.5
-9.5
- -
9
-9 -
-8.5
-8.5
- -
8
-8 -
-7.5
-7.5
- -
7
-7 -
-6.5
-6.5
- -
6
-6 -
-5.5
-5.5
- -
5
-5 -
-4.5
-4.5
- -
4
-4 -
-3.5
-3.5
- -
3
-3 -
-2.5
-2.5
- -
2
-2 -
-1.5
-1.5
- -
1
-1 -
-0.5
-16
-15
-14
-13
-12
-11
-10
-9 -8 -7 -6 -5 -4 -3 -2 -1
Le
ge
nd
pc
_d
og
leg
gu
lf_
3ft
_N
AV
D8
8O
PU
S_
Ma
rch
20
12
_ra
mp
Ele
va
tio
n
-31
.57 -
-31
.5
-31
.5 -
-3
1
-31
- -
30.5
-30
.5 -
-3
0
-30
- -
29.5
-29
.5 -
-2
9
-29
- -
28.5
-28
.5 -
-2
8
-28
- -
27.5
-27
.5 -
-2
7
-27
- -
26.5
-26
.5 -
-2
6
-26
- -
25.5
-25
.5 -
-2
5
-25
- -
24.5
-24
.5 -
-2
4
-24
- -
23.5
-23
.5 -
-2
3
-23
- -
22.5
-22
.5 -
-2
2
-22
- -
21.5
-21
.5 -
-2
1
-21
- -
20.5
-20
.5 -
-2
0
-20
- -
19.5
-19
.5 -
-1
9
-19
- -
18.5
-18
.5 -
-1
8
-18
- -
17.5
-17
.5 -
-1
7
-17
- -
16.5
-16
.5 -
-1
6
-16
- -
15.5
-15
.5 -
-1
5
-15
- -
14.5
-14
.5 -
-1
4
-14
- -
13.5
-13
.5 -
-1
3
-13
- -
12.5
-12
.5 -
-1
2
-12
- -
11
.5
-11.5
- -
11
-11 -
-10
.5
-10
.5 -
-1
0
-10
- -
9.5
-9.5
- -
9
-9 -
-8.5
-8.5
- -
8
-8 -
-7.5
-7.5
- -
7
-7 -
-6.5
-6.5
- -
6
-6 -
-5.5
-5.5
- -
5
-5 -
-4.5
-4.5
- -
4
-4 -
-3.5
-3.5
- -
3
-3 -
-2.5
-2.5
- -
2
-2 -
-1.5
-1.5
- -
1
-1 -
-0.5
-3
2
-31
-30
-29
-28
-27
-26
-25
-24
-23
-22
-21
-20
-19
-18
-17
Le
ge
nd
De
pth
, ft
(N
AV
D8
8)
-16 -12 -10 -8 -6 -4 -2
-32 -28 -16 -24 -22 -20 -17
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500
-30
-25
-20
-15
-10
-5
0
5
Ju
l20
17
Jul2017
Smooth
smooth
Distance Along-Channel from Basin
Ele
va
tio
n, ft
(N
AV
D8
8)
Legend
Jul 2017 Pre-Ike
Oct 2017 Post-Ike
Gulf of
Mexico
Entrance
ChannelInner Entrance ChannelBasin
Ike
2008
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500
-30
-25
-20
-15
-10
-5
0
5
Ju
l20
17
Jul2017
Jul2017
postharvey
Distance Along-Channel from Basin
Ele
va
tio
n, ft
(N
AV
D8
8)
Legend
Jul 2017 Pre-Harvey
Oct 2017 Post-Harvey
Gulf of
Mexico
Entrance
ChannelInner Entrance ChannelBasin
Harvey
2017
West East
Along
9/1/2008 9/6/2008 9/11/2008 9/16/2008 9/21/2008 9/26/2008 10/1/2008
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
-4
-2
0
2
4
8/5/2017 8/10/2017 8/15/2017 8/20/2017 8/25/2017 8/30/2017 9/4/2017
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
-4
-3
-2
-1
0
1
2
3
4
Date (MDY)
+ Flood
- Ebb Ike
Water Velocity
Water Level
Water Velocity
Water Level
+ Flood
- Ebb
Alo
ng-
Ch
ann
el C
urr
ent
Vel
oci
ty, m
/sW
ater Level, ft MSL
HarveyW
ater Level, ft MSL
Ike
Gulf of
Mexico
Packery
Channel
Mustang
Island
NPI
Island
Velo
city m/s
1.5 m/s
0 m/s
Force Driving Scour and Structural Damage
Developed by: Larry Dell and Philippe Tissot (CBI TAMUCC)
North Padre Island
And
Mustang Island
Net Volume
Change and Rate of
Erosion
City Jurisdiction
and
Multi-Jurisdictional-175,000 cy
-70 cy/ft
Bob Hall
Pier
+41,000
+11 cy/ft
-38,200 cy
-17 cy/ft
+38,000 cy
+11 cy/ft
-454,000 cy
-24 cy/ft
Padre
Balli
Park
Viento del
Mar
Mustang
Island
State
Park
Fish Pass
-23,000 cy
-14 cy/ft
City Jurisdiction
Net Erosion
City Jurisdiction
Net Accretion
County Jurisdiction
Net Erosion
County Jurisdiction
Net Accretion
State Jurisdiction
NPI Seawall Limits
1.0 mi/
1.6 km
Scale
Newport
Pass
Mustang
Island
North
Padre
Island
Gulf of
Mexico
-38,200 cy
-7 cy/ft
²
Legend
Aug 2004 Pre-Construction
Sep 2007 (Pre-Ike)
Pre-Ike Pre-Harvey
Legend
Aug 2004 Pre-Construction
Jul 2017 (Pre-Harvey)
Shoreline Position Change
Legend
Aug 2004 Pre-Construction
Sep 2007 (Pre-Ike)
Sep 2008 (Post-Ike)
Legend
Aug 2004 Pre-Construction
Jul 2017 (Pre-Harvey)
Sep 2017 (Post-Harvey)
Post-Ike Post-Harvey
Legend
Aug 2004 Pre-Construction
Sep 2007 (Pre-Ike)
Sep 2008 (Post-Ike)
Jul 2009 (10 mo. Post Ike)
Post-Ike Recovery
> Erosion
North End of Seawall
Recovery
Legend
Aug 2004 Pre-Construction
Jul 2017 (Pre-Harvey)
Sep 2017 (Post-Harvey)
Apr 2018 (8 mo. Post Harvey)
Post-Harvey
Partial Recovery
Post-Ike: Recovery Post-Harvey: Partial Recovery
Packery
Post- Ike
Post- Harvey
Viento Del
Mar Packery
Post Ike:
-48 ft/yr
Post Harvey:
-13 ft/yr
Rate of Shoreline Position Change:
Viento del Mar to Packery
NPI Seawall
Packery Newport Fish Pass
Post- Harvey
Post- Ike
Rate of Shoreline Position Change:
Mustang Island
Post Ike:
-62 ft/yr
Post Harvey:
-25 ft/yr
Reach 1Reach 2Reach 3
Boat Ramp
Parking Lot
SH361
Bridge
Structural Assessment:
Packery Structural Components
• Reach 1
10 ton Granite
Blocks
• Reach 2
1 to 3 ton Riprap
• Reach 3
Concrete Block
Mattresses
(ABMs)
• Reach 4
Unprotected on
north side
• Displaced armor stones
• Indication that some damage
occurred during previous
storms (Hurricane Ike)
• Repairs include re-setting the
stones
Structural Assessment:
Reach 1 Damage
• Damages to armor stone weaken system for
next storm
• Damage presents increased threat for more
significant damage and greater repair cost
Structural Assessment:
Reach 1 Original Design
Reach 1Reach 2Reach 3
Boat Ramp
Parking Lot
SH361
Bridge
Packery Structural Components:
Reach 2
• Reach 2
1 to 3 ton Riprap
• Displaced Riprap
• Damage likely Cumulative of Previous Storm Impacts
• Existing Damage = System More Prone to Future Damage
• Repairs Should Place additional riprap to rebuild section
Structural Assessment:
Reach 2 Damage
Reach 1Reach 2Reach 3
Boat Ramp
Parking Lot
SH361
Bridge
• Reach 3
Concrete Block
Mattresses
(ABMs)
Packery Structural Components:
Reach 3
• Loss of Foundation Material Beneath ABM and Sidewalk
• Recommended repairs:
Removal of ABM, Re-grade Slope, and Replacement of
Protection
• Damage progressively worsen until repaired
Structural Assessment:
Reach 3 Damage
Structural Assessment:
Reach 3 Location of Damaged Segments
End Material