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


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.


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


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)


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)


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)


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?

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