A new correction procedure for shallow-water effects in ship speed trials
Author Hoyte C. Raven
Title A new correction procedure for shallow-water effects in ship speed trials
Conference/Journal 13th International Symposium on Practical Design of Ships (PRADS), Copenhagen, Denmark
Paper no. ID121
Month September
Year 2016

Abstract
To correct ship speed trials for limited shallow-water effects, Lackenby’s method is currently recommended by the ITTC. This method appears to be based on very few and inadequate
data. To replace it, a new procedure is proposed. It corrects separately for the effects of shallow water on the different components of ship resistance. These have been identified by
computational studies.A simple algorithm is proposed to estimate a power increase for equal speed in shallow water. This new correction method has been applied to dedicated shallow-water trials for two ships and was found to perform much better than Lackenby’s method.

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