Bathymetry of the terminus of Kangerlussuup Sermia, Greenland

Multibeam bathymetry data were collected on 21 and 23 July 2013 using a pole-mounted RESON SeaBat 7111 Multibeam Sonar System. Positioning data were acquired using an Applanix POS/MV model 320 positioning and orientation system. The survey operated at 100 kHz with 301 equi-angle beams, and we constrained the sound velocity profile at the time of the survey using in situ conductivity-temperature-depth casts. We collected data along the submarine calving face by inserting a 15 degree wedge into the multibeam sonar system mount to maximize vertical imaging. The resulting point cloud data represent individual measurements of the terminus location and were processed using Caris software to remove anomalous pings and to merge multibeam returns with positioning and orientation data.研究团队采用杆装式RESON SeaBat 7111多波束声呐系统，于2013年7月21日与23日采集多波束测深数据。定位与姿态数据通过Applanix POS/MV 320型定位定向系统获取。本次测量作业以100 kHz工作频率运行，配备301个等角度波束；并通过原位温盐深测量剖面，对测量时刻的声速剖面进行约束校正。为最大化垂直成像效果，研究团队在多波束声呐系统的安装基座上加装15度楔形构件，沿水下冰崩崖壁采集数据。最终生成的点云数据代表了各测点的终端位置信息；研究团队使用Caris软件对数据开展后处理，剔除异常声呐脉冲，并将多波束回波数据与定位定向数据进行融合。