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FIELDWORK AT TEIGNMOUTH, UK

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Title: FIELDWORK AT TEIGNMOUTH, UK


1
FIELDWORK AT TEIGNMOUTH, UK
  • Overview of the characteristics of the May 2003
    Campaign
  • (Phase II 12/05/03 30/05/03)

2
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

3
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
4
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

5
CSI FIELD DATA MATRIX
6
MORPHOLOGICAL SURVEYS
  • Rational
  • Ground truth for Video - CSIs
  • Breaking wave patterns (2D)
  • Intertidal mapping (3D)
  • Subtidal mapping (3D)
  • Location of dredging
  • System Classification

7
MORPHOLOGICAL SURVEYS
  • How?
  • Kinematic DGPS mounted on quad-bike or boat (
    echosounder) land-based station.
  • 13 -23 May (2003)

26 Nov 10 Dec 2002
8
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
9
SHORELINE SURVEYING
  • Rational
  • Ground truth for Videoderived 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

10
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
11
SHORELINE SURVEYING (Trinocular video)
3 video cameras
Looking at a delimited area on the beach
Data cabled to a car-based PC
12
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

13
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.

14
WAVE DIRECTIONAL SPECTRUM (ADCP)
  • Rational
  • Directional wave climate offshore (CSI)

15
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

16
WAVE DIRECTIONAL SPECTRUM (ADCP)
  • November 2002
  • 22 days of data (every 30 min)
  • May 2003
  • 18 days of data (every 30 min)

17
SHORT-TERM PROCESSES (SLOT)
  • Rationale
  • Understanding the sediment transport mechanisms
    important for the long term morphological changes
    (Robinsons cycle)

18
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

19
SHORT-TERM PROCESSES (SLOT)
  • Which variables, where and when
  • OBS (suspended sediments), EMCM (horizontal
    currents), PT (surface elevation), installed at
    the low water mark.

SLOT
  • November 2002
  • 3 SLOT systems in 5 different positions.
  • Shore attached bar and adjacent beach
  • 65 tides of data at 2 Hz

S
20
V
21
SLOT 3 ON CREST OF SHORE-ATTACHED BAR
22
STORM PEAK ON 10 DECEMBER
23
(No Transcript)
24
SUMMARY
Field data needs Nov Dec 2002 May 2003 Future
Bathymetric surveys ? ? ?
Beach morphology ? ? ?
Shoreline surveying ? ? ?
ADCP (currents) ? ? ?
ADCP (directional waves) ? ? ?
SLOT data ? ? ?
  • All this data is now available on the server

25
SHORT-TERM PROCESSES (SLOT)
BACK
26
SHORT-TERM PROCESSES (SLOT)
  • System state on May 2003 (from seawall)
  • System state on May 2003 (from pier)

BACK
27
Phase I Morphological SurveysNov Dec 2002
Quad-bike surveys
Boat surveys
BACK
28
Phase II Morphological SurveysMay 2003
Quad-bike surveys
Boat surveys
BACK
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