Coastal Engineering information (1)
description
Transcript of Coastal Engineering information (1)
Paper 5: Application of Paper 5: Application of
remote sensing video remote sensing video
systems for coastal systems for coastal
stability problems on stability problems on
natural beachesnatural beaches
Coastal Engineering Coastal Engineering information (1)information (1)
• Title:Title: Application of remote sensing video Application of remote sensing video
systems to coastal stability problems on systems to coastal stability problems on
natural beachesnatural beaches
• Authors:Authors: Aart Kroon, Troels Aagaard, Stefan Aart Kroon, Troels Aagaard, Stefan
Aarninkhof, Paolo Ciavola, Aarninkhof, Paolo Ciavola, Mauricio González, Mauricio González,
Rob Holman, Ruud SpanhoffRob Holman, Ruud Spanhoff
• Pages:Pages: 20 20
Coastal Engineering Coastal Engineering information (2)information (2)
ObjectivesObjectives: :
• Different time-scales involved in coastal stability problems. Different time-scales involved in coastal stability problems.
Traditional measurements only cover a couple of scales. Traditional measurements only cover a couple of scales.
Relevant video-derived variables (coastal state indicators) Relevant video-derived variables (coastal state indicators)
will bridge the scales. Long time-series of (aggregated) will bridge the scales. Long time-series of (aggregated)
CSIs are applied to solve the coastal stability problem. CSIs are applied to solve the coastal stability problem.
• Assessment of seasonal and yearly temporal variability Assessment of seasonal and yearly temporal variability
(trend signals and noise).(trend signals and noise).
• Threshold values beyond which intervention will be Threshold values beyond which intervention will be
required.required.
Coastal Engineering Coastal Engineering information (3)information (3)
Indicative contents:Indicative contents:
Coastal stability: coastal safety, recreation & navigationCoastal stability: coastal safety, recreation & navigation
Temporal and spatial variability in CSIs related to:Temporal and spatial variability in CSIs related to:
• WaterlinesWaterlines
Shoreline positions, shoreline exceedence curves,Shoreline positions, shoreline exceedence curves,
beach width, beach volumes beach width, beach volumes
• FeaturesFeatures
Rip channel locations, bar locations, dune positionsRip channel locations, bar locations, dune positions
• (Hydrodynamics(Hydrodynamics
Alongshore currents : not enough data)Alongshore currents : not enough data)
ExamplesExamples
Sites: only examples of the Dutch coast (not in the final Sites: only examples of the Dutch coast (not in the final
paper)paper)
WaterlinesWaterlines
Shoreline positions, shoreline exceedence curves,Shoreline positions, shoreline exceedence curves,
beach width, beach volumes:beach width, beach volumes:
Italy, Netherlands, Spain Italy, Netherlands, Spain
FeaturesFeatures
Rip channel locations, bar locations, dune Rip channel locations, bar locations, dune
positions:positions:
Italy, Netherlands, SpainItaly, Netherlands, Spain
Coastview: RecreationCoastview: Recreation
Beach widthDune foot & water lines
Noordwijk beach0 100 200 300 400 500 600 700
0
100
200
wid
th (
m)
mean inter-tidal beach
0 100 200 300 400 500 600 7000
100
200
wid
th (
m)
mean supra-tidal beach
0 100 200 300 400 500 600 7000
1
2
3
tid
al r
ang
e (m
)
time (days in 2001 & 2002)
Stefan AarninkhofAart Kroon
Kathelijne Wijnberg
Coastview: Recreation Coastview: Recreation Non-permanent beach restaurants
Noordwijk beach
Aart Kroon
Egmond beach
Coastview: shorelines and Coastview: shorelines and nourishmentnourishment
Kathelijne Wijnberg, Stefan Aarninkhof
Egmond Jan van Speijk (June 29, 2000)
Egmond Jan van Speijk (July 7, 2000)
Nourishment July 2000
Egmond beach
Coastview: Shorelines and Coastview: Shorelines and nourishmentnourishment
Kathelijne Wijnberg, Stefan Aarninkhofdata M. Caljouw , L. Nipius data C. Reintjes
Egmond beach
Coastview: Shorelines and Coastview: Shorelines and nourishmentnourishment
Kathelijne Wijnberg, Stefan Aarninkhof
Mean : 57 m 57 m 0 mSt.dev. : 29 m 16 m 25 mVariance : 838 m2 211 m2 (25%) 627 m2 (75%)
Coastview: Coastal SafetyCoastview: Coastal Safety
Time (months)
MC
L &
MIC
L (m
)
Coastal SafetyBeach volumes
traditional surveysARGUS& IBM
Egmond beachStefan Aarninkhof
Coastview: Recreation Coastview: Recreation
Recreation or NavigationRip location and spacing
ARGUS
April 1998-1999
Egmond beachAart Kroon
Contents (1)Contents (1)
AbstractAbstract
Introduction Introduction (see previous slides)(see previous slides)
aim (CSIs for coastal stability problems)aim (CSIs for coastal stability problems)
questions addressedquestions addressed
ARGUS-relatedARGUS-related
CSIs time-seriesCSIs time-series
contents of the sectionscontents of the sections
Contents (2)Contents (2)
MethodsMethods
no explanation of the standard video techniques: no explanation of the standard video techniques:
oblique – planoblique – plan
determination of water lines, bar lines, rip locationsdetermination of water lines, bar lines, rip locations
definitions and computation of beach widths, -volumes,definitions and computation of beach widths, -volumes,
and –volumetric derivatives (MCL, etc.)and –volumetric derivatives (MCL, etc.)
statistics of the exceedence curvesstatistics of the exceedence curves
simple time-series techniques (correlation techniqes, C-simple time-series techniques (correlation techniqes, C-
EOF)EOF)
Contents (3)Contents (3)
ResultsResults
(1)(1) Time-series of water lines (shore lines, beach width Time-series of water lines (shore lines, beach width
[E, I, NL], beach volumes [NL]) [E, I, NL], beach volumes [NL])
determination of variables and field determination of variables and field
verificationverification
quantification of trends and other variabilities quantification of trends and other variabilities
quantification of threshold values and quantification of threshold values and
gradual/sudden changesgradual/sudden changes presentation of forcing presentation of forcing
conditions (water levels, waves)conditions (water levels, waves)
Contents (4)Contents (4)
ResultsResults
(2)Time-series of features (bar positions, rip positions [I,NL])(2)Time-series of features (bar positions, rip positions [I,NL])
determination of variables and field verification determination of variables and field verification
quantification of trends and other variabilities quantification of trends and other variabilities
quantification of threshold values and quantification of threshold values and
gradual/sudden changesgradual/sudden changes presentation of forcing presentation of forcing
conditions (water levels, waves)conditions (water levels, waves)
Contents (5)Contents (5)
DiscussionDiscussion
(1)(1) Coupling between forcing and time-seriesCoupling between forcing and time-series
of water lines, shore lines, beach width, beach volumes of water lines, shore lines, beach width, beach volumes
direct forcing and self organizationdirect forcing and self organization
(2)Determination of the temporal and spatial variability in (2)Determination of the temporal and spatial variability in
relation to the management questions addressed relation to the management questions addressed
does it solve any problem?does it solve any problem?
(3)Persistency and robustness of the CSIs(3)Persistency and robustness of the CSIs
ConclusionsConclusions
This workshopThis workshop
Agreement over the contents.Agreement over the contents.
Who is doing what? (tasks with time schedule)Who is doing what? (tasks with time schedule)
Paper-group and individual discussions:Paper-group and individual discussions:
what are the CSIs (time-series) you’d like to contribute?what are the CSIs (time-series) you’d like to contribute?
what is the method you used to compute the CSIs (there are what is the method you used to compute the CSIs (there are
some some
standards now, how do they relate to each other)?standards now, how do they relate to each other)?
what is the proposed benefit of your exercise to the CZManager?what is the proposed benefit of your exercise to the CZManager?