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  • Development of TASS
  • Development of TASS
  • Development of TASS
  • Development of TASS
  • Development of TASS

Development of TASS

Our TASS software is used to predict sediment release rates from trailing suction hopper dredgers. HR Wallingford developed TASS in collaboration with the Dutch-funded ECOSHAPE project.

The TASS system predicts

The overflow discharge model has been validated against measured overflow data from Bremerhaven, Hook of Holland and Den Helder. The model (on average) predicted overflow sediment concentrations to within 17% of the peak concentration in the load and (on average) predicted won tonnage to within 7.5%. The TASS model has also been validated against far-field measurements from Hook of Holland and Den Helder (Aarninkhoff et al, 2010).

The TASS software provides a much improved system for managing dredging operations.


Jeremy Spearman


Trailing suction hopper; dredger; TSHD; overflow; plume; dispersion.




Aarninkhof SGJ, Spearman J, de Heer AFM and van Koningsveld (2010). Dredging induced turbidity in a natural context, status and future perspectives of the TASS program. Proceedings of the 19th World Dredging Conference (WODCON XIX), Beijing, China.

Spearman, J., De Heer, A. and Aarninkhof , S.G.J. and Van Koningsveld, M. (2011) Validation of The TASS System For Predicting The Environmental Effects Of Trailing Suction Hopper Dredging, , Terra et Aqua, 125, p14.

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Jez Spearman

Jez Spearman

Technical Director

+44 (0)1491 822462

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