DOI: 10.5061/dryad.ksn02v7fz
title: Temperature timeseries and idealized simulations of internal solitary waves colliding with the Grande-Anse wharf, Saguenay Fjord, Canada

description: In 2019, the Motor Vessel Jaeger Arrow collided with the Grande-Anse
 Terminal wharf (Saguenay Fjord, Canada) during docking from unknown
 causes. However, the timeline of the incident and the ship's behavior
 during docking suggest that underwater waves may have caused the
 collision. Data collected in 2023 using a camera and thermometers
 confirmed that this area of the fjord regularly experiences underwater
 waves with wavelengths ranging from 50 to 100 m, wave heights of 1 and 3
 m, and periods of around 2 min. These waves frequently collide with and
 reflect off the wharf, generating currents of 0.1 to 0.3 m s-1. Numerical
 simulations further illustrate the interactions between the waves and the
 wharf, highlighting regions near the wharf where wave-induced currents,
 both inshore and offshore, occur, including areas with near-zero currents
 that could create a false sense of calm conditions. Importantly, our
 observations also revealed that large ships, such as the Jaeger Arrow, can
 generate their own underwater waves, potentially compromising docking
 operations. While we cannot definitively confirm that underwater waves
 caused the incident involving the Jaeger Arrow, our study offers a
 plausible explanation: the ship may have been caught in a wavetrain
 reflecting off the wharf, leading to unpredictable movement during
 docking. These results highlight the potential risks posed by underwater
 waves to ship safety and maneuverability during docking operations, a
 topic under-explored in existing scientific literature.
description: This dataset includes: 1) Temperature,
 salinity, and pressure measurements from CTD casts at two locations: (48°
 25.40′ N, 70° 51.94′ W) and (48° 24.81′ N, 70° 47.53′ W).
 2) NetCDF outputs from 2D idealized numerical simulations
 conducted using the MITgcm. 3) Temperature time series
 collected at 48° 24.107′ N, 70° 50.001′ W at various depths using 14
 RBRsolo<sup>3</sup> T temperature sensors and one
 RBRduet<sup>3</sup> T.D temperature-depth sensor. The deepest
 instrument, positioned one meter above the seafloor, was the
 temperature-depth sensor. All time series are stored in a NetCDF
 file.
description: # Temperature profiles and idealized simulations of internal solitary
 waves colliding with the Grande-Anse wharf, Saguenay Fjord, Canada
 [https://doi.org/10.5061/dryad.ksn02v7fz](https://doi.org/10.5061/dryad.ksn02v7fz) ## Description of the data and file structure This dataset contains: 1\) The **CTD_data** directory which contains two CTD profiles taken in the vicinity of the Grande-Anse Terminal. This directory includes: * **CTD_far_field.mat**: A MATLAB file containing depth (*z*) in meters and density (*rho*) in kg m⁻³ from CTD measurements at two stations: * Station A (48° 25.40' N, 70° 51.94' W) – variables labeled with the suffix *PMZA06*. * Station B (48° 24.81′ N, 70° 47.53′ W) – variables labeled with the suffix *F14*. * **read_CTD_mat.py**: A Python script designed to read the data from **CTD_far_field.mat**. 2\) The **MITgcm_runs** directory which contains three repositories with NetCDF outputs from 2D idealized simulations of four internal solitary waves colliding with the Grande-Anse Wharf in the Saguenay Fjord, Canada. The simulations differ by the value of the Available Potential Energy (APE) used to initialize the internal solitary waves with the DJL solver. The three repositories are named **APE1e4, APE1e5, and APE5e5**, corresponding to the respective APE values. Each repository contains four NetCDF files: * **grid.glob.nc**: Stores all grid variables. * **SurfDiag.APEXeX.nc**: Contains snapshots of the *surface height anomaly* every 5 seconds. * **dynDiag.APEXeX.nc**: Includes snapshots of the *density anomaly* and *zonal and vertical mass-weighted velocities* every 5 seconds. * **state.APEXeX.nc**: Captures the instantaneous state of the model at the beginning, midpoint, and end of the simulation. 3\) The **RBR** directory contains temperature and pressure time series for two events of internal solitary waves colliding with the Grande-Anse Wharf on September 20, 2023, and September 27, 2023. This directory includes two NetCDF files, named after the event date: * **rbr_20230920.nc** * **rbr_20230927.nc** Each file contains *temperature* and *pressure* time series as a function of depth, recorded at 48° 24.107′ N, 70° 50.001′ W during the respective internal wave events.