Lunchtalk by Henrike Maris

Modeling the two-way coupling between Lanice Conchilega and sand waves on the bottom of the North Sea

The tube-building worm Lanice conchilega is an ecosystem engineer, which affects its environment by changing the local hydrodynamics and therewith the sediment dynamics. Dynamic patches with these tubes are implemented into a sand wave model, in order to study the two-way coupling between these tubes and the sand waves. The tubes and sand waves are both influencing each other. The tubes are first of all, modeled on a flat bottom and thereafter, they are modeled on a sinusoidal and self-organisational bottom. After approximately one year the mounds (elevations formed by the tubes) reach an equilibrium height. In the sand waves the patches tend to change the bed level only locally.