02.09.2009 S. 1

Pilot study 2: Assessment of sediment traps

02.09.2009 S. 2

Sediment trap Wedel

Bearing: March 2008HPA 223

02.09.2009 S. 3

Sediment trap Wedel

Trap built 5.5.08-23.06.08

Depth ~ 2m

Width~300 m

Leng

th ~

2 k

m

New sedimentation rate~ 10000 to 12000 m³ per day

Sieblinien Strom-Km 641-643 Feb.2008 Sande

0

20

40

60

80

100

10 100 1000 10000

Körnungsdurchmesser (µm)

(Gew

icht

s-%

)

W08-001_95-200

W08-002_140-200

W08-004_80-180

W08-005

W08-006

W08-007

W08-015

W08-016

63 200 63020

Grain-size of bottom material in µm

Vo

lum

e in

%

02.09.2009 S. 4

Monitoring programme

• Echo sounding• Water (temperature, salinity,

oxygen, current, pollution)• Suspended sediment and bed load

(concentration, grain size, pollution)• Fish (survey of fish eggs and larvae)

Cross-section:

water sample

Aanderaa turbiditydevice

Calibration of the long-term turbidity measurements

bottom

Aanderaa RCM 9 or Aanderaa seagurad

Long-term measurement with Aanderaa measuring devices

Near bottom measuring device within the sediment trap