Paper 5: Application of remote sensing video systems for coastal stability problems on natural beaches

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Paper 5 Application of remote sensing video
systems for coastal stability problems on natural
beaches
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Coastal Engineering information (1)

• Title Application of remote sensing video
  systems to coastal stability problems on natural
  beaches
• Authors Aart Kroon, Troels Aagaard, Stefan
  Aarninkhof, Paolo Ciavola, Mauricio González, Rob
  Holman, Ruud Spanhoff
• Pages 20

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Coastal Engineering information (2)

• Objectives
• Different time-scales involved in coastal
  stability problems. Traditional measurements only
  cover a couple of scales. Relevant video-derived
  variables (coastal state indicators) will bridge
  the scales. Long time-series of (aggregated) CSIs
  are applied to solve the coastal stability
  problem.
• Assessment of seasonal and yearly temporal
  variability (trend signals and noise).
• Threshold values beyond which intervention will
  be required.

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Coastal Engineering information (3)

• Indicative contents
• Coastal stability coastal safety, recreation
  navigation
• Temporal and spatial variability in CSIs related
  to
• Waterlines
• Shoreline positions, shoreline exceedence
  curves,
• beach width, beach volumes
• Features
• Rip channel locations, bar locations, dune
  positions
• (Hydrodynamics
• Alongshore currents not enough data)

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Examples

• Sites only examples of the Dutch coast (not in
  the final paper)
• Waterlines
• Shoreline positions, shoreline exceedence
  curves,
• beach width, beach volumes
• Italy, Netherlands, Spain
• Features
• Rip channel locations, bar locations, dune
  positions
• Italy, Netherlands, Spain

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Coastview Recreation
Beach width Dune foot water lines
Noordwijk beach
Stefan Aarninkhof Aart Kroon Kathelijne Wijnberg
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Coastview Recreation
Non-permanent beach restaurants
Noordwijk beach
Aart Kroon
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Coastview shorelines and nourishment
Egmond Jan van Speijk (June 29, 2000)
Nourishment July 2000
Kathelijne Wijnberg, Stefan Aarninkhof
Egmond beach
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Coastview Shorelines and nourishment
data M. Caljouw , L. Nipius
data C. Reintjes
Kathelijne Wijnberg, Stefan Aarninkhof
Egmond beach
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Coastview Shorelines and nourishment
Mean 57 m 57 m 0 m St.dev. 29 m 16 m 25
m Variance 838 m2 211 m2 (25) 627 m2 (75)
Kathelijne Wijnberg, Stefan Aarninkhof
Egmond beach
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Coastview Coastal Safety
Coastal Safety Beach volumes
traditional surveys
ARGUS IBM
MCL MICL (m)
Time (months)
Stefan Aarninkhof
Egmond beach
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Coastview Recreation
Recreation or Navigation Rip location and spacing
ARGUS
April 1998-1999
Aart Kroon
Egmond beach
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Contents (1)

• Abstract
• Introduction (see previous slides)
• aim (CSIs for coastal stability problems)
• questions addressed
• ARGUS-related
• CSIs time-series
• contents of the sections

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Contents (2)

• Methods
• no explanation of the standard video techniques
  oblique plan
• determination of water lines, bar lines, rip
  locations
• definitions and computation of beach widths,
  -volumes,
• and volumetric derivatives (MCL, etc.)
• statistics of the exceedence curves
• simple time-series techniques (correlation
  techniqes, C-EOF)

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Contents (3)

• Results
• (1) Time-series of water lines (shore lines,
  beach width E, I, NL, beach volumes NL)
  determination of variables and field
  verification
• quantification of trends and other
  variabilities
• quantification of threshold values and
  gradual/sudden changes presentation of forcing
  conditions (water levels, waves)

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Contents (4)

• Results
• (2)Time-series of features (bar positions, rip
  positions I,NL)
• determination of variables and field
  verification
• quantification of trends and other
  variabilities quantification of threshold
  values and gradual/sudden changes presentation of
  forcing conditions (water levels, waves)

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Contents (5)

• Discussion
• (1) Coupling between forcing and time-series
• of water lines, shore lines, beach width, beach
  volumes
• direct forcing and self organization
• (2)Determination of the temporal and spatial
  variability in relation to the management
  questions addressed does it solve any
  problem?
• (3)Persistency and robustness of the CSIs
• Conclusions

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This workshop

• Agreement over the contents.
• Who is doing what? (tasks with time schedule)
• Paper-group and individual discussions
• what are the CSIs (time-series) youd like to
  contribute?
• what is the method you used to compute the CSIs
  (there are some
• standards now, how do they relate to each
  other)?
• what is the proposed benefit of your exercise to
  the CZManager?