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FIELDWORK AT TEIGNMOUTH, UK. Overview of the characteristics of the May 2003 Campaign (Phase II 12/05/03 – 30/05/03). CONTENTS. Site characteristics Objectives of the field campaign Coastal State Indicators & field data needs

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fieldwork at teignmouth uk

FIELDWORK AT TEIGNMOUTH, UK

Overview of the characteristics of the May 2003 Campaign

(Phase II 12/05/03 – 30/05/03)

contents
CONTENTS
  • Site characteristics
  • Objectives of the field campaign
  • Coastal State Indicators & field data needs
  • Comparison of data collected (Phase I vs Phase II) (how, where, main variables, main results)
    • Morphology measurements
    • Shoreline surveying
    • ADCP measurements (currents and waves).
    • SLOT data (waves, currents, and sediment transport)
  • Summary
site characteristics

Sediment movement

SITE CHARACTERISTICS
  • Complex system of multiple bars
    • Long-term cycle (5-8 years)
  • Sandbar movement cause:
    • Navigational problems
    • Recreational hazards
    • Governs sediment budget on the beach (affecting the structural stability of seawall)

slot

objectives
OBJECTIVES
  • Provide “ground truth” for validation and development of video-derived CSIs
    • Provide in-depth understanding of the morphological cycle (video) and the associated (short term) sediment transport processes (SLOT).
      • Show data availability and methods of collection to partners
csi field data matrix

Coastal Management Issues Video-derived CSIs Field data

Video-derived CSIs

Field data needs

  • Breaking wave patterns (2D)
  • Intertidal mapping (3D)
  • Subtidal mapping (3D)
  • Bathymetric surveys
  • Surface currents
  • Beach morphology
  • Location of channel markers
  • Shoreline surveying
  • Location of dredging
  • ADCP (currents)
  • Directional wave spectra
  • ADCP (directional waves)
  • System classification
  • SLOT data
CSI FIELD DATA MATRIX
morphological surveys
Rational

Ground truth for Video - CSIs

Breaking wave patterns (2D)

Intertidal mapping (3D)

Subtidal mapping (3D)

Location of dredging

System Classification

MORPHOLOGICAL SURVEYS
morphological surveys1
How?

Kinematic DGPS mounted on quad-bike or boat (+ echosounder) & land-based station.

13 -23 May (2003)

MORPHOLOGICAL SURVEYS

26 Nov – 10 Dec 2002

morphological surveys2
MORPHOLOGICAL SURVEYS
  • Where and how many

Nov- Dec 2002 (Phase I)

  • 6 Quad-bike surveys
  • 3 Boat surveys

May 2003 (Phase II)

  • 4 Quad-bike surveys
  • 3 Boat surveys

tracks

tracks

shoreline surveying
Rational

Ground truth for Video–derived Intertidal mapping

Assess shoreline variability in time and space (swash)

Related with wave energy level (In which way?)

Estimate errors in video-derived shoreline detection

SHORELINE SURVEYING
shoreline surveying1
SHORELINE SURVEYING

November 2002

  • Hand-held DGPS following shoreline + compare with rapid sampling

May 2003

  • Trinocular video system on the beach
    • Resolves elevations (z) and variability in time.
    • 12.5 hr footage sampled at 1 Hz.
  • Problems:
    • Difficult to operate
    • Cannot resolve shoreline variability (space and time)

BACK

shoreline surveying trinocular video

GCPs and cameras regularly surveyed (with style) with total station

3 video cameras

SHORELINE SURVEYING (Trinocular video)

Looking at a delimited area on the beach

Data cabled to a car-based PC

3d currents in channel adcp
Rational

Surface currents in channel

Can we identify the channel through current structure

Intensity of currents at channel

Surface currents elsewhere

Can rip currents be identified

3D CURRENTS IN CHANNEL (ADCP)
slide13

3D CURRENTS IN CHANNEL (ADCP)

November 2002

  • Not performed

May 2003

  • Collaboration with University of Cantabria (ADCP)

Problems:

    • Need to remain stationary (no bottom tracking)
  • Current measurements in the channel in June with bottom tracking ADCP.
wave directional spectrum adcp
Rational

Directional wave climate offshore (CSI)

WAVE DIRECTIONAL SPECTRUM (ADCP)
wave directional spectrum adcp1
WAVE DIRECTIONAL SPECTRUM (ADCP)
  • Where and How:
    • ADCP mounted in a steel frame
    • Deployed by boat at 4-5 m depth offshore from the

Ness Headland

wave directional spectrum adcp2

3

3

2

Hs (m)

2

Hs (m)

1

1

0

20

0

15

20

Tp (sec)

10

15

Tp (sec)

5

10

0

5

26/11

30/11

4/12

8/12

12/12

16/12

20/12

0

November – December 2002

12/05

16/05

20/05

24/05

28/05

May 2003

WAVE DIRECTIONAL SPECTRUM (ADCP)

November 2002

22 days of data (every 30 min)

May 2003

  • 18 days of data (every 30 min)
short term processes slot
Rationale

Understanding the sediment transport mechanisms important for the long term morphological changes (Robinson’s cycle)

SHORT-TERM PROCESSES (SLOT)
short term processes slot1
SHORT-TERM PROCESSES (SLOT)
  • Onshore migration of sandbanks in the vicinity of coastal inlets is a very common phenomena.

Kennebeck River, Maine, USA

Wadden Sea Inlets, NL

short term processes slot2

May 2003

  • 2 SLOTs in 4 different position at offshore sandbank only
  • 18 tides of data at 4 Hz

Pier

SEAWALL

SHORT-TERM PROCESSES (SLOT)
  • Which variables, where and when
    • OBS (suspended sediments), EMCM (horizontal currents), PT (surface elevation), installed at the low water mark.

November 2002

  • 3 SLOT systems in 5 different positions.
  • Shore attached bar and adjacent beach
  • 65 tides of data at 2 Hz

SLOT

S

slide20

Tidal elevation (m)

2

0

-2

3

S-SSE

Hs (m)

2

1

N-NE

0

26

27

28

29

30

01

02

03

04

05

06

07

08

09

10

11

November

December

V

slide23

Tidal elevation (m)

2

0

-2

3

S-SSE

Hs (m)

2

1

N-NE

0

26

27

28

29

30

01

02

03

04

05

06

07

08

09

10

11

November

December

summary
SUMMARY
  • All this data is now available on the server
slide26

SHORT-TERM PROCESSES (SLOT)

  • System state on May 2003 (from seawall)
  • System state on May 2003 (from pier)

BACK

phase i morphological surveys nov dec 2002
Phase I Morphological SurveysNov – Dec 2002

Quad-bike surveys

Boat surveys

BACK

phase ii morphological surveys may 2003
Phase II Morphological SurveysMay 2003

Quad-bike surveys

Boat surveys

BACK