SGIG

SGIG

Financed by

03/74

05/62

19/6702/74

20/67

05/74

01/8703/87

Baland Bank

Stroom Bank

M iddelkerke Bank

N ieuw poort Bank

R avelingen

Potje

Broers Bank

K le ine R ede

Trapegeer

Den OeverWestdiep

Sm alBank

Noordpasswale

N

1 0 1 5 10 km

2°30'E 2°45 'E 3°00 'E

51°05'N

51°10'N

51°15'N

D u n k e r q u e France

Koksijde

De Panne

N ieuw poort

Belg ium

O ostende

W estern C oasta l Banks

F lem ish Banks

D utchcoast

Belg iancoast

Area of interestArea of interest

Proposed Natura 2000 areas

Special protection area

Site of Community Interest

International importance for waterfowl

e.g. common scoter Melanitta nigra

Food resource: macrobenthos

Importance of benthic habitat

SGIG

Financed by

Bathymetric-morphological map

Sedimentological map

Hydrodynamical map

Macrobenthic map

PRELIMINARY MAPS

Selection subarea

sampling campaign: spatial variation

(macrobenthos, physico-chemical environment)

sampling campaign: temporal variation


HABITAT STRUCTURE MAP

Sampling campaign: test


DEVELOPMENT OF MONITORINGS STRATEGIES AND METHODOLOGIES

TO EVALUATE THE MANAGEMENT PLAN

Schematic presentationSchematic presentationof the HABITAT projectof the HABITAT project

DEVELOPMENT OF QUICK AND LOW-COST EVALUATION TOOLS

HABITAT-model and Macrobenthic Side-Scan Sonar Interpretation

Study areaStudy area

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Eastings

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Nor

thin

gs

Potjeswale

W estdiepswale

Broers Bank

TrapegeerSmal Bank

U TM 31 ED 50 co-ord inates

0 1 kmFrench border

Nieuwpoort

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D epth in m eter (M LLW S)

WESTDIEPSWALE

POTJESWALE

TRAPEGEERBANK

BROERSBANK

SMALBANK

Background informationBackground information

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Potjeswale

W estdiepswale

Broers Bank

U TM 31 ED 50 co-ord inates

Trapegeer

Asym m etric sand dune- o ffshore orientationAsym m etric sand dune- onshore orientation

Sym m etrica l sand dune

C om pound (cat-back)sand dune

Sw ash bar

Bedform s

0 1 km

Smal Bank

Nieuwpoort

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Westdiep

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Trapegeer

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354

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3

2.5

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1.5

1

M ean G rain-sizem u - ph i

0 1 km

U TM 31 ED 50 coord inates

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0.18

0.49 0.2

0.52 0.5 0.36

0.55 0.53 0.49 0.4

0.58 0.58 0.55 0.57 0.47

0.57 0.63 0.61 0.59 0.57 0.46

0.56 0.61 0.63 0.66 0.59 0.52

0.56 0.56 0.58 0.65 0.67 0.57 0.54

0.52 0.56 0.66 0.63 0.59

0.52 0.62 0.62

0.56 0.58

0.54

0 1 km

U TM 31, E D 50 coord inates

Hydrodynamical characteristics

M axim um current velocity (m /s)

- sem i-d iurnal tides of m acrotidal range- strongly rectilinear currents

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No

rth

ing

s

Potje

W estdiep

Broers Bank

U TM 31 ED 50 coord inaten

Trapegeer

Smal Bank

Nieuwpoort

French border0 2 km

'M ytilus edu lis ' com m unity

Lan ice conch ilega com m unity

N ephtys c irrosa com m unity s.l.

Geomorphology Sedimentology

Hydrodynamics Macrobenthos

No spatial extrapolation possible

Detailed investigation necessary

Sampling campaignsSampling campaigns

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Potje

Westdiep

Broers Bank

UTM 31N pro jection (ED50)

Trapegeer

Smal Bank

Nieuwpoort

French border

0 2 km

Area 1

Area 2

Area 3 Northernarea

Southernarea

Remote sensing tracks

Ground truthing sampling points

Biology (120 stations)

Macrobenthic species composition, density and biomassMacrobenthic community structure

Physico-chemical environment (120 stations)

Pigment content of the water column and sedimentNutrient content of the water column and sedimentGrain-size distributionTemperature, oxygen concentration and salinity

Remote sensing (3/5 of area)

Side-scan sonar recordingsBathymetry (single- and multibeam)

October 1999, March 2000, November 2000

Variables taken into accountVariables taken into accountG

rou

nd

tru

thin

g s

amp

lin

g p

oin

ts

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M edian (m m )grain-size

Fine sands(125-250 m u)

M edium sands(250-500 m u)

Coarse sands(500-1000 m u)

U TM 31-ED 50 coord inates

0 1 km

HABITATOctober 1999

surficial sedim ents

Sedimentological mapSedimentological map

Digital terrain model

from multibeam registrations

Bathymetrical settingsBathymetrical settings

Side-scan sonar Side-scan sonar mosaicsmosaics

VHR multiparameter image

on the basis of combined

multibeam – side-scan sonar imagery

3D presentation: side-scan sonar & multibeam3D presentation: side-scan sonar & multibeam

Anthozoa Bivalvia Crustacea Echinodermata

Gastropoda Oligochaeta Polychaeta

Macrobenthos: Macrobenthos: compositioncomposition

Macrobenthos: community structureMacrobenthos: community structure

Abra alba – Mysella bidentatacommunity

Ophelia limacina – Glycera lapidumcommunity

Nephtys cirrosacommunity

Magelona mirabilisspecies association

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F ren ch b o rd e r

N ie u w p o o rt

g ro u p B

g ro u p D

g ro u p A

g ro u p C

L eg en d

Macrobenthos:Macrobenthos: spatial distribution spatial distribution





Habitat structure map

SEDIMENTOLOGY

SIDE-SCAN SONAR

RECORDINGSMACROBENTHOS

Macrobenthichabitat preferences

Sedimentologicalinterpretation

MACROBENTHIC SIDE-SCAN SONAR INTERPRETATION

CONCEPTCONCEPT

Macrobenthic habitat preferences: sedimentologyMacrobenthic habitat preferences: sedimentology

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U TM 31-E D 50 coord ina tes

0 1 km

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177

210

250

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M edian (µm )grain-s ize

Fine sands(125-250 µm )

M edium sands(250-500 µm )

Coarse sands(500-1000 µm )

Com m unity GroupsM . m irab ilis spec. ass.A . a lba - M . b identa ta com m .N . c irrosa com m .O . lim acina - G . lap idum com m .





Sedimentological interpretation of side-scan sonar recordingsSedimentological interpretation of side-scan sonar recordings

TRAPEGEER POTJE SWALE

(northern branch)

BROERSBANK

-2

-3

-4

-5Depth (m MLLWS)

Fine sands Medium sands

Medium dunes Coarser grainedwave ripples

Medium sands Fine sands with

higher silt-clay %

(higher degree of compaction)

050100150200250300350400450500 m

84 m

Macrobenthic side-scan sonar interpretation:Bioherm structures

-2

-4

-6

-81200 m0

TRAPEGEER POTJE SWALE(northern branch)

Visibility on SSS

Sample showing a very high abundance of Lanice conchilega

200 400 600 800 1000

0

10

20

30

40

50

0 10 - 50 50 - 100 100 -250

250 -500

500 -1000

> 1000

density classes of Lanice conchilega

No

0

5000

10000

15000

20000

tota

l den

sity

No total density

Macrobenthos:Macrobenthos: Lanice conchilegaLanice conchilega

0 200 400 600 800 1000

C um u la tive d istance (m )

- 8

- 7

- 6

- 5

- 4

- 3

De

pth

ML

LW

S (

m)

H A9910.012

H A9910.011

Swale area (Potje) Shoreface

Sid e-scan sonar imager y

d50: 178 musilt-clay: 3.5 %shells: 0 .9 %

d50: 177 musilt-clay: 9.4 %shells: 4 .8 %

Ar ea r epr esentat iv e ofCommunity B

Slope ar ear epr esentat iv e of

Community A

Macrobenthic side-scan sonar interpretation:Sedimentological habitat preferences (1)

Area representative forA. alba – M. bidentata community

Area representative forM. mirabilis

species association

0 200 400 600 800 1000

Cum u la tive d istance (m )

- 7

- 6

- 5

- 4

- 3

- 2

De

pth

ML

LW

S (

m) HA9910.005

HA9910.006

Sandbank area (Trapegeer)characterised by very large dunes

Swale area (Potje)

Sid e-scan sonar imager y

d50: 280 musilt-clay: 2 %shells: 11 % d50: 165 mu

silt-clay: 4.8 %shells: 10 %

Ar ea r epr esentat iv e ofCommunity C to D

Slope ar ear epr esentat iv e of

Community B

Macrobenthic side-scan sonar interpretation:Sedimentological habitat preferences (1)

Area representative forN. cirrosa or O. limacina – G. lapidum

community

Area representative forA. alba – M. bidentata

community

Macrobenthic side-san sonar interpretation

Descriptive part Interpretation part

Full-coverage delineation of ecological relevant strata

HABITAT model

MODELING

Quantified linking of environmental and macrobenthic parameters using

multiple discrimant analysis

Biology

Physical environment

Chemical environment

HABITAT model

CONCEPTCONCEPT

Based on macrobenthic habitat preferences

Quantified linking

Identification of ecological relevant variables

Strategies for future monitoringStrategies for future monitoring

1. Selection of strata, based on remote sensing

end-user and budget-dependent

2. Follow-up of monitoring stations

Macrobenthos

Ecological relevant environmental variables (cf. HABITAT model)

3. Full-coverage monitoring of the benthic environment

e.g. side-scan sonar

SGIG

Documents

Transcript of SGIG