Tom Kristian Hoffmann

Tom Kristian Hoffmann
Leibniz Universität Hannover · Ludwig-Franzius Institute of Hydraulics, Waterways and Coastal Engineering

Master of Science
PhD in coastal engineering: Roughness effects of oyster reefs & photogrammetric evaluation of reef propagation


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BIVA-WATT project: Roughness effects of oyster reefs and blue mussel beds in the German Wadden Sea
Additional affiliations
January 2020 - present
Leibniz Universität Hannover
  • Research Associate
October 2018 - July 2019
University of Ottawa
  • Researcher
  • Experimental investigations of tsunami-induced
January 2017 - December 2019
Leibniz Universität Hannover
  • Student Assistant
October 2016 - January 2020
Leibniz Universität Hannover
Field of study
  • Coastal Engineering


Publications (3)
Full-text available
The Pacific oyster ( Magallana gigas ) is an invasive species in the Wadden Sea transforming parts of it permanently. M. gigas , as an ecosystem engineer, builds reef structures that are characterized by highly complex and variable surfaces consisting of densely packed, sharp-edged individuals connected with cement-like bonds. To investigate the in...
Die Hauptfunktion von Seedeichen liegt im Sturmflutschutz. Seedeiche sind gleichzeitig jedoch auch Teil eines Ökosystems, das wertvolle Funktionen haben kann. Eine ökologische Aufwertung von Seedeichsystemen kann zum einen durch die Aufwertung von Deichvorland und Küstenökosystemen, zum anderen durch die ökologische Aufwertung des Deichbauwerks sel...
Zum Schutz der Seedeichoberfläche gegen Erosion wird bei niedrigen bis moderaten hydraulischen Belastungen im Allgemeinen der Einsatz und die Unterhaltung einer Grasdeckschicht empfohlen. Der erhöhte Widerstand der Grasdeckschicht im Vergleich zu einer reinen Kleideckschicht wird im Wesentlichen durch das Wurzelwerk in Verbindung mit dem anstehende...


Project (1)
The German Wadden Sea has undergone significant changes in the last years due to the invasion of the Pacific oyster (Crassostrea gigas). Spreading from aquaculture farms, C. gigas has extended its spatial coverage throughout the German Bight, most likely due to increased water temperatures as a result of climate change. Juvenile oysters require hard substrates to settle on, which they mainly find on blue mussel beds on the intertidal flats. As a result, Pacific oysters have replaced the formerly typical blue mussel beds as the pristine and predominant biogenic habitat. In contrast to the loose connections between the individual blue mussels, C. gigas forms extremely strong bonds resulting in complex, rigid surface structures referred to as oyster reefs. Oyster reefs are highly resistant to mechanical stress, including hydrodynamic loadings. Hence, it is hypothesized that the rough, rigid reef surfaces dampen waves and tidal currents due to frictional dissipation and can significantly reduce the wave energy reaching the shore. To date, very little research has been conducted on the inter-relation between oyster reefs and adjacent hydrodynamics. The overarching aim of the BIVA-WATT project is to understand the underlying processes involved and quantify the energy dissipation caused by oyster reefs. The project is executed in cooperation between the Leichtweiß-Institut (LWI) and the Institute of Structural Design (ITE) of the Technical University of Braunschweig, the Ludwig-Franzius-Institute of Hydraulic, Estuarine and Coastal Engineering of the Leibniz University Hannover, Senckenberg am Meer, Wilhelmshaven and smile consult GmbH. The project is funded by BMBF.