Observations of sedimentation near a hydrocarbon drilling site and impacts on a sponge specimen

The data consist of hourly observations of sedimentation impacts located approximately 31 m southwest of the drilling location, including measurements of proxies of suspended material in the water column, along with observations of the lamellate desmosponge specimen. Acoustic backscatter (1.9-2.0 MHz) and current speed were measured using a Seaguard RCM DW. A time-lapse camera was also deployed: the Nikon E995 camera was set to F 6.0, ISO 200, exposure 1/60, with photos of 2048 x 1536 pixels. As another estimate of suspended material in the water column, brightness (as mean RGB) was calculated for top corners (256 x 256 pixels) in photos, where the corners were not obscured by fish. Settlement of sediment on the sponge specimen was estimated as brightness of a portion of it (approximately 3600 pixels2) in the images. Movement of the sponge was estimated as the distance between successive xy-positions of the apex of the sponge in images. Mean values (6- and 12-hourly) centred on the hourly data, and sums of distance over 6- and 12-h periods were also calculated.

本数据集包含钻探点位西南约31米处的沉积影响逐小时观测数据，涵盖水柱中悬浮物质替代指标的测量结果，以及层状寻常海绵（lamellate desmosponge）标本的观测记录。声学背散射（1.9-2.0 MHz）与流速数据通过Seaguard RCM DW设备采集。此外还部署了延时摄影相机：采用尼康E995相机，设置为光圈F6.0、ISO感光度200、曝光时长1/60秒，拍摄像素规格为2048×1536的图像。作为评估水柱悬浮物质的另一项指标，研究人员对照片中未被鱼类遮挡的顶角区域（256×256像素）计算了RGB平均值以表征亮度。海绵标本表面的沉积物沉降量通过图像中其指定区域（约3600像素²）的亮度进行估算。海绵的位移情况则通过图像中海绵顶点连续的xy坐标之间的距离来计算。同时还计算了以逐小时观测数据为中心的6小时与12小时平均值，以及6小时和12小时周期内的总移动距离。