The Function of Wood in Stream
Stream
Rosgen Pg 5-153
Before
After
Large Wood Stores Sediment
and build Floodplains
Before
Stream Cross-Section
After
Large Wood in the Flood Plain
Plain
Potential
Potential
Erosion
Erosion
Live & Dead Wood =
EnergyDissi
Dissipation
ation
Logjam
Back-Pressure
Flo w
Sediment
Sediment Deposition
Deposition
Energy Dissipation
Dissipation
W
idt
h
1.5
X
Me
an
n
a
Me
h
t
d
i
W
(Spreading)
Natural Log Sill
FFlloow
w
Energy
Energy
Dissipation
Dissipation
(Drop)
Sediment
Sediment Storage
Storage
Roughness
Roughness Elements
Elements
Point Bar
Jam
Wood Processing
Pool
Riffle
Bar
Scour
Point Bar Building
Building
LWM
Scour
Energy Dissipation!
Dissipation!
Roughness Elements
Terrace
Terrace Building
Building
Back-Pressure
Back-Pressure
Roughness
Element
Terrace Building
Riparian
Riparian Vegetation
Vegetation
Bank stabilization
LWD
LWD in
in Transition
Transition
Roughness Elements
Elements
Energy Dissipation
Complexity
Complexity
Food
Cover
Cover
Biological Diversity
Channel Narrowing
Narrowing
Wood Processing
Processing
Channel Narrowing
Narrowing
Bank Building
Energy Dissipation
Identify
Identify Wood
Wood Functions
Functions in
in this
this Photo
Photo
How
How about
about in
in this
this Photo?
Photo?
March 19, 2000
Logjam
Logjam Constructed
Constructed 1986
1986
John
John Anderson
Anderson &
& Mike
Mike Wisdom
Wisdom USBLM
USBLM