1. Sediment surface Main flow direction x y z Measuring point Flux contribution x Footprint definition: smallest area that contributes with 90% of the flux Footprint prediction – 3D modeling Source: Peter Berg

2. Footprint prediction – 3D modeling x y z Measuring point Main flow direction Modeling turbulent transport and dispersion of a tracer released from different locations on sediment surface Source: Peter Berg

3. Footprint prediction – 3D modeling 010002000300040005000600070008000 150 100 50 0 -50 -100 -150 y (cm) x Relatively smooth sediment surface (z 0 = 0.1 cm) Measuring height over sediment surface: h = 30 cm 90% 10% Source: Peter Berg

4. Footprint prediction – 3D modeling 010002000300040005000600070008000 150 100 50 0 -50 -100 -150 y (cm) x 30 cm 20 cm 10 cm 15 cm 5 cm 25 cm Length of footprint: Source: Peter Berg