Validation of The TASS System For Predicting The Environmental Effects Of Trailing Suction Hopper DR

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

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Abstract

TASS is a software programme that enables the user to predict the spatial development and concentration of turbidity plumes arising from dredging activities by trailer suction hopper dredgers. TASS has been developed because of a recognised need by the dredging industry to improve the quality of predictions of the effects of dredging in Environmental Impact Assessments. This article describes the TASS model and the validation of TASS predictions against validation measurements off the Dutch and German coasts. The results show that the TASS system reproduces the observed concentrations of the overflow discharge well, as well as the observed increases in suspended sediment concentrations in the far-field. In addition the measurements highlight the fact that most of sediment released in the overflow is not seen in the far-field passive plume but descends to the bed as a dynamic plume. Evidence from the measurement campaign confirms the results of previous measurements undertaken in Hong Kong that the far-field plumes initially represent roughly 5-15% of the fine material released in the overflow discharge. Identifying how this percentage may be predicted a priori is an area on ongoing research. Present efforts focus on further development and validation of the model for a variety of environmental conditions. Once thoroughly tested, the model will be made publicly available to facilitate sound predictions of dredging-induced turbidity. The authors would like to thank the staff of Deltares, Rijkswaterstaat and Jim Rodger for their work in the TASS field measurement campaign upon which this study has relied. In addition the authors would like to thank Neville Burt, Hans Otten, Wim Rosenbrand, Nick Bray and the late John Land. Without their enthusiasm and persistence in the early stages of the TASS project this study would not have been possible.

Item Type: Article
Additional Information: HRPP497
Subjects: Maritime > General
Maritime > Dredging and disposal
Divisions: Maritime
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:49
Last Modified: 18 May 2020 13:10
URI: http://eprints.hrwallingford.com/id/eprint/850

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