Triple-D dredge benthos sampling

Triple-D dredge

The Triple-D (Deep Digging Dredge) was developed to quantitatively sample the larger-sized, often more sparsely distributed and longer-lived in- and epifauna. A prototype was described in Bergman and van Santbrink (1994). The Triple-D (2.40* 2.60*1.20 m; weight 1200 kg; towing speed 3 knots) effectively excises a 20 cm deep strip of sediment with a width of 20 cm from the seabed, of which the length of 100 m is controlled by an odometer triggering a pneumatic opening/closing mechanism. The sediment washes through the 7x7 mm meshes of a 6 m net astern the dredge. Catches of the Triple-D representing the fauna in 20 m2 are sorted and identified on board (for technical details Triple-D see https://www.youtube.com/watch?v=O3XIFzbljWk).

Triple-D 挖掘器（深层挖掘挖泥船）系为定量采集较大尺寸、分布较为稀疏且生命周期较长的海底及底栖生物而设计。原型在 Bergman 与 van Santbrink（1994）所著文献中有所描述。Triple-D 挖掘器（尺寸为 2.40*2.60*1.20 米；重量为 1200 公斤；牵引速度为 3 节）能够从海底有效挖掘出深度为 20 厘米、宽度为 20 厘米的泥沙带，其长度为 100 米，由里程计控制并触发气动开闭机构。泥沙通过位于挖泥船后方的 6 米长网（网孔直径为 7x7 毫米）的 7x7 mm 网孔。Triple-D 捕集的样本，代表 20 平方米的生物群落，在船上进行分类和鉴定（关于 Triple-D 的技术细节，请参阅 https://www.youtube.com/watch?v=O3XIFzbljWk）。