An analysis of the response of Sines’ terminal XXI basin to long waves’ action

Abstract

This paper describes the measurements and subsequent analysis procedures at the Terminal XXI of the Port of Sines, the operational problems at this location reported by ship authorities, and the numerical analyses carried out for the identified resonant situations during the period under scrutiny. The identified situations are studied to determine whether the reported problems are effectively due to resonance phenomena or to another nonrelated circumstance. A thorough characterization of the resonance characteristics of this harbor basin in its current configuration layout is made both using a simple approach of comparing data measured by tide gauge and buoy data, by relating characteristics of short waves and long waves within the basin, and a more complete study using wavelets to investigate the time evolution of the energy spectrum. Resonant oscillation periods of the basin are also computed with DREAMS numerical model.