Transcript No Slide Title

Hydrotechnical Considerations
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Overview
•Hydrotechnical Design
•River Issues
Lateral Stability
Vertical Stability
Blockage - ice, drift
•River Protection Works
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Hydrotechnical Design
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The Hydrologic Cycle
Sun
Snowmelt
Snow
Mountains
Lakes
Rain
Hail
Streams
Evaporation
Groundwater
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Rivers
Oceans
Drainage Basin Parameters
•Area
•Shape
•Slope
•Storage
•Density
•Vegetation
•Soil Type
•Initial Moisture
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Runoff Response
Variation Across
Alberta
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Hydrotechnical Design Guidelines
•Channel Capacity
•channel size result of long-term runoff
•channel size affects routing of runoff
•typical channel
•activate overbank storage
•Historic Highwater Data
•HWM – AIT, AENV, WSC, site, airphoto, news
•Location, description
•Runoff Potential
•Limit on supply of runoff
•Unit discharge
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Hydraulic Definitions
Water Surface
V=Q
A
Y
A
Q
Thalweg
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Flow Constriction - Stream Crossing
Bridge
Culvert
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Flowlines - Before Constriction
Bank
Flow
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Flowlines - After Constriction
Q=V*A
Q=V*A
Q=
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V*
A
Flow Profile - After Constriction
Energy Grade Line
Water Surface
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File 00278 - Battle River
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File 00278 - Battle River
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File 00278 - Battle River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 07107 - Iron Creek
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BF76474 – Smoky River at Grande Cache
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File 80827 - Nelson Creek
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File 80827 - Nelson Creek
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File 79475 - Bald Mountain Creek
File 79475 - Bald Mountain Creek
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File 79475 - Bald Mountain Creek
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File 79475 - Bald Mountain Creek
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File 01324 - Pigeon Creek
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File 01324 - Pigeon Creek
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File 78230 - Brewster Creek
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File 81653 - Watercourse
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River Issues
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Lateral Stream Stability
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High
Stability of Stream Types
1
Relative Stability
2
3a
3b
Low
4
5
High
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Relative Stability
Low
BF9259 – Freeman River
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BF8036 – Redwillow River
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BF13078 – Little Red Deer River
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File 81113 - Marten Creek
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File 75904 - Island Creek
File 75904 - Island Creek
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File 75904 - Island Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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Blockage - Drift, ice …
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File 78889 - Whitecourt Creek
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File 71979 - Heart River
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File 72964 – Howard Ck
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Drift accumulation can increase
velocities around piers
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BF 6754 Bow River at Cluny
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Ice scarring on trees
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Ice impact damage and abrasion on piers
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Other debris?
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Vertical Stream Stability
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Typical Stream Profile
Erosion Reach Transport Reach Deposition Reach
•Erosion = Deposition
•Flatter Slope
•Aggradation
•Deltas, Fans
Elevation (m)
•Steeper Slope
•Degradation
Bedrock
Distance From Headwater (km)
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Sediment
File 76995 - Malcolm Creek
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File 76617 - Cougar Creek
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File 76617 - Cougar Creek
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River Response
Dam
QsD50 ~ QS
Aggradation
Degradation
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BF74852 – Bear River
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BF74852 – Bear River
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BF73235 – Cucumber Ck
575
DTM
570
Elevation (m)
Survey
565
560
555
550
0
100
200
300
400
500
Station (m)
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600
700
800
900
BF73235 – Cucumber Ck
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BF73235 – Cucumber Ck
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General Scour
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BF74710 – Berland River
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Local Scour Profile
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Local Scour in Plan View
Flow Parallel to Pier
Flow on Skew to Pier
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Smoky River CanFor Bridge
Failure of a pier on spread footing due to
general scour
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BF 78104 McLeod River near Peers - alignment problem
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River Protection Works
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Typical Rock Riprap Section
1
2
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Location of River Protection Works
Embankment
Spurs
Spurs
Guidebank
Grade Control
Structure
Dyke
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File 81795B - Red Deer River (1992)
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File 81795B - Red Deer River
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File 81795B - Red Deer River
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File 81795B - Red Deer River
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File 81795B - Red Deer River
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File 81795B - Red Deer River (1999)
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File 81778B - Wapiti River
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File 81778B - Wapiti River
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File 81793B - Swan River
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File 81793B - Swan River
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File 81793B - Swan River
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…Questions?
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