From: Long-term changes of intertidal and subtidal sediment compositions in a tidal basin in the northern Wadden Sea (SE North Sea)
Sediment
First mode (Phi)
Mud (S 1)
>6
Coarse mud (S 2)
6–4
Fine sand (S 3)
4–2.5
Medium sand (S 4)
2.5–1
Coarse sand (S 5)
<1