Please use this identifier to cite or link to this item:
Title: Vertical ship motion study for Ambrose Entrance Channel, New York
Authors: Briggs, Michael Jeffrey
Demirbilek, Zeki
Lin, Lihwa
Keywords: Ambrose Channel
Navigation channel
New York
Vertical ship motion
Ship squat
Container ship
Ambrose Mound
Numerical model
Publisher: Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (Engineer Research and Development Center (U.S.)) ; no.ERDC/CHL TR-14-3
Abstract: New York Harbor Pilots have expressed a concern to the New York District (NAN) about a mound that is approximately 1.5 miles seaward of the new limit of the Ambrose Channel. This mound is probably construction rubble that was placed there when the original Light Tower isolated and protected it somewhat from the main channel. The mound’s diameter and depth are similar to the width and depth of the Ambrose Channel offshore reach. Now that the Light Tower is no longer marking this mound, the Pilots are concerned about whether a ship might experience larger or more dramatic ship motions due to possible amplification across the mound relative to similar transits in the offshore reach. The US Army Engineer Research and Development Center (ERDC), Coastal and Hydraulics Laboratory (CHL), used the numerical models STWAVE and CMS-Wave to evaluate possible amplification effects of a range of wave conditions. The Channel Analysis and Design Evaluation Tool (CADET) was used to predict vertical ship motions due to wave-induced heave, pitch, and roll. Ship squat estimates calculated with the PIANC and Ankudinov empirical formulas were compared with the Beck, Newman, Tuck (BNT) squat predictions used in CADET. The net underkeel clearance based on these vertical ship motion components was used in a risk-based method of evaluating transits over the mound compared to similar transits in the main channel. These results were used to select a minimum dredge depth over the mound to insure that inadvertent transits over the mound would not incur any significant differences in ship response and potential grounding relative to similar transits in the offshore reach of the Ambrose Channel.
Description: Technical Report
Gov't Doc #: ERDC/CHL TR-14-3
Rights: Approved for public release; distribution is unlimited
Appears in Collections:Technical Report
Technical Report

Files in This Item:
File Description SizeFormat 
ERDC-CHL-TR-14-3.pdfERDC/CHL TR-14-35.65 MBAdobe PDFThumbnail