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18
18
Sebtember
Sebtember
2007
2007
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BED, BANK & SHORE
BED, BANK & SHORE
PROTECTION
PROTECTION
Lecturer: Pham Thu Huong
Lecturer: Pham Thu Huong
Email:
Email:


Faculty of Coastal Engineering
Faculty of Coastal Engineering
18

18
Sebtember
Sebtember
2007
2007
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TRƯ


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NG
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Đ


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Chapter 10
Chapter 10
Environment
Environment
(3 class hours)
18
18
Sebtember
Sebtember
2007
2007
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Content
Content
10.1 Introduction
10.2 Loads
10.3 Stability
10.4 Erosion
10.5 Summary
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Content

Content
10.1 Introduction
10.2 Bed protections
10.3 Bank protections
10.4 Shore protections
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Introduction
Introduction
¾ Ecologists stress that for a healthy environment
there should be a good connection between land and
water
¾ So shorelines are multifunctional elements in the
landscape
¾ Main issues:
• use of vegetation
• allow animals to migrate from land to water and
vice versa
• use of sustainable materials
So:

vertical walls are certainly not good
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ecological infrastructure
ecological infrastructure
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river as ecological connection
river as ecological connection
with stepping stones

with stepping stones
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comparison
comparison
Space requirements versus discharge capacity,
nautical possibilities, ect.
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species and dynamics

species and dynamics
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food chain relations
food chain relations
in a bank
in a bank
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hardly any

hardly any
exchange of
exchange of
life is
life is
possible
possible
between land
between land
and water
and water
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crossing location for mammals
crossing location for mammals
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Exit for animals
Exit for animals
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planning and execution of steps
planning and execution of steps
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Đ


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load and strength
load and strength
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Basic types of shoreline protection
Basic types of shoreline protection
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filter tests for nature friendly
filter tests for nature friendly
fascine mattress
fascine mattress
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Reed and waves
Reed and waves
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Damping of wave loads
Damping of wave loads
0.8
11exp0.001
cos
T
T
I
H
B
KN
H
β


⎛⎞
==−− −


⎜⎟
⎝⎠


N = number of stalks per m
2
B = width of vegetation
β = angle of incidence

0° for windwaves
55° for ship waves
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wave damping and roughness in reed
wave damping and roughness in reed
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roots
roots

as an
as an
armour
armour
against
against
sliding
sliding
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permissible flow duration on
permissible flow duration on
grass cover
grass cover
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NG

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reinforced vegetation
reinforced vegetation
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Vegetation growing through rock
Vegetation growing through rock
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Armorflex
Armorflex
with vegetation
with vegetation

×