“The views, opinions and findings contained in this report are

those of the authors(s) and should not be construed as an

official Department of the Army position, policy or decision,

unless so designated by other official documentation.”

Coastal Storm Risk Management and

Ecosystem Restoration Project along the

Texas Coast

Mike Diaz, Himangshu Das & Charlie Brandstetter

03/27/2019

Configuration and performance expectations of Bolivar

Roads deep draft navigable storm surge barrier

SYSTEM

Freshwater Flow:

Includes Trinity River

(66%) and San Jacinto

River (19%)

Tide Period (Diurnal dominated) : 24

Hour

Bolivar Inlet constitutes about 80% of

tidal exchange (Flux

Tide Range : 1 -2 ft

Tidal Range decays

progressively into the bay

system

Range 1: ~3 ft/s

Range 3: 1-2 ft/s

Observed Velocity (May 2011)

Simulated Velocity (Harvey, 2017)

Range1

(5-6 ft/s)

TIDE AND CURRENT (DATA)

Harvey (Aug 29)

Bay Salinity

October 10, 2017

Harvey decimated

Galveston Bay's oyster

population

-Houston Chronicle, Sept

21, 2017

Red Reef Fish

#Stressors

Above 6.5m Storm surge

RSLC : 2 ft per 100 year

OPPORTUNITY (BARRIER, GATE SYSTEM..)

Alignment 1

Deep Draft

ShallowSection

IntermediateTie-in

Inlet is about 2 mile (3.2 KM) long

Varying Depth (~50 ft in deeper section –HSC

Shallow section ~10 ft Depth

Deep Intermediate Shallow

SHIP SIMULATION

Alignment 1

Alignment 2, Single Lane

is Preferred

PERFORMANCE

Base (Without Project)Alt A

Difference (Alt A – Base)

Max. Wind Speed: 152 mph (Cat. 4)

Min. Cp: 915 mb

Rmax: 24.6 nm

Forward Speed: 5.9 kts

PERFORMANCE

Example Vertical Lift Gate

Many Options Explored

Example Sector Gate (Rotterdam)

Innovative Piston Gate at

Closure

Thames, London

Mose System, Venice

GATE DESIGN WORKSHOP (SWG, 03/17-03/29)

Deep Intermediate Shallow

CTS Barrier Design

Constraints & Criteria1. Hydraulics [Constraints]

2. Environment [Conveyance,

Footprint]

3. Construction [Alignment,

Constructability,

Technology]

4. Cost [Construction cost,

O&M]

5. Operation and Reliability

[Gate closure, Reliability,

adaptability]

International Network for Storm

Surge Barriers (I-STORM)

RANKING CRITERIA (OVERALL GOAL)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

a Blockage Ratio 10 2.7 3 2.7 1.6 3.3 3.2 2.3 3.7 4 3 4.3 2.1 2.3 1.6 3 1.8 4 3.2 2.6 4.3 2.2 1.8 4.6 3.8 2.1 3.8 2.6 2.3 4 1.8

b Time to open and close 10 4 3.8 4.1 2.1 1.7 2.6 2.3 4.3 2.1 4.1 1.9 2.7 3.7 3.6 3.3 4.2 2.1 3.9 3 2.6 3.6 3.7 4.2 3.6 4.2 2.2 2.7 3.1 3.2 2.4

c Alignment 10 3.3 2.9 3.2 2.3 4.3 3.7 3.8 4 3.3 1.8 3 2.7 3.3 4.3 2.1 3.2 4.1 4.2 2.1 3.1 4.1 3.8 2.9 2.6 3.1 2.1 3.3 4.1 4.1 3.3

d Cost 10 2.6 2.7 2.2 3.4 3.6 3 3.6 2.9 4.1 3.7 4.3 3.7 3 2.6 3.6 4 4.2 2.7 1.3 4.2 3.6 4.6 4.2 2.2 3.9 2.9 3.6 2.8 2 2.7

e Operation and Maintenance Cost 11 4.1 2.4 2.3 3.9 3.8 3.2 3.7 1.7 2.1 1.6 1.8 3.6 3.9 4.6 4.2 3.7 4.1 3 1.6 3.4 3.2 2.3 3 2.4 2.8 4.4 2.6 1.8 2 2.8

f Reliability and Redundancy 11 3.3 3.4 4.2 2.8 2.2 3.1 1.9 3.8 2.1 3 2.9 2.8 2.1 3.2 3 2.9 1.6 3.6 2.7 3.7 2.6 3 3 4.2 3.7 2.6 4.8 3 3.7 2.2

g Adaptability 11 3.8 2 4.2 1.9 3 1.7 3 4 3.7 2.9 2.8 2.2 3.2 4.2 3.8 4.4 3.9 2.3 3.8 1.2 2.6 2.6 3.1 3.2 3.7 2.7 4.2 3.4 1.8 1.8

h Constructability 11 3.1 2.1 4.4 1.8 4.3 3.6 3 2.3 3.4 4.2 1.3 3.6 1.9 3.6 2.2 4.1 4.2 2.8 2.9 2.4 1.4 3 2.1 3.4 4.3 2.3 4.1 2.1 4.3 2.4

i Technology 7 1.3 3.1 3.3 3.2 2.3 1.9 1.2 2.1 1.9 4.2 2.8 2.6 3.7 3.9 3.4 4.9 4 2 3.9 3.7 3.4 3.9 2.1 1.7 3.2 2 3 2.4 4 1.8

j Impact 9 1.6 3.6 2.1 3.2 1.7 3.6 2.8 4.2 2 3.9 2.3 2.9 1.7 2.4 2.4 2.8 2.6 4.4 2 2.8 2.4 3.7 2.2 2.1 1.7 4.8 2.2 3.6 2.8 1.9

Design Scores - RAW

Criteria Weight (5%, 10%, 15%)

Shallow Draft Intermediate Draft Deep Draft

Proven Technology:

Best: Floating Sector Gate

Mid: Rising Sector Gate, Flap

Gate

Worst: Piston Gate, Vertical

Drop Gate

Cross Sectional Area:

Best: Flap Gate, Piston Gate

Mid: Rising Sector Gate,

Vertical Lift Gate

Worst: Floating Sector Gate

(can be mitigated)

Comparison of Structures depends on what is most important

Bolivar Road Crossing

• Vertical Lift Gates

• Large Navigation Gate

• Environmental Gates

Preferred Options

Goal: Close to zero percent closure

Shallow Section Int. Section (Lift Gate)

Deep Section (2 Sector Gate)