3D seismic reflection data have been used to map 784 enigmatic ridge-furrow structures in water depths of 0.8–1.7 km offshore Angola. The structures are characterised by asymmetric ridges with intervening furrows, typically <0.5–5.5 km long, with a sinuous to bifurcating planform. The furrows are well-imaged on seismic profiles, and range from 60 to 80 m in width, up to 10 m in amplitude, and 0.1–1 km in wavelength. The furrow sets aggrade in a downslope direction and occur in arrays that have an internally consistent direction that is either parallel, or slightly diverging or converging. Two alternative origins are considered: (1) furrows that are dominantly erosional scours formed from seafloor-incising currents flowing parallel to the furrows, with the ridges a by-product of the erosion, or (2) the ridge-furrows are bottom-current generated dune-type sediment waves. The latter interpretation allows us to reconstruct a key component of the deepwater bottom-currents regime along this continental margin from the Middle Pleistocene to the present-day. The most likely transport agent responsible for the interpreted sediment waves is a palaeo-bottom-current regime with a flow direction toward the west-southwest/south-southwest, the same direction of the sediment wave migration. The palaeo-bottom currents would then be expected to have a very specific flow regime with 1 < Fr_max < 2 and may originate from longshore currents cascading off the shelf, Congo Canyon distal overflows, breaking internal waves or a mixture of these processes.

3D 地震反射数据已被用于绘制安哥拉近海 0.8-1.7 公里水深中 784 个神秘的脊沟结构图。这些结构的特点是不对称的山脊，中间有沟，通常长 <0.5-5.5 公里，具有弯曲到分叉的平面。沟渠在地震剖面上成像良好，宽度范围为 60 至 80 m，幅度可达 10 m，波长范围为 0.1–1 km。犁沟沿下坡方向增加，并出现在具有内部一致方向的阵列中，该方向平行或略微发散或会聚。考虑了两种替代来源：(1) 主要是侵蚀冲刷形成的沟渠，由与沟渠平行流动的海底切割电流形成，山脊是侵蚀的副产品，或 (2) 脊沟是底流产生的沙丘型沉积波。后一种解释使我们能够重建从中更新世到现在沿这片大陆边缘的深水底流制度的一个关键组成部分。对解释的沉积波负责的最可能的传输因子是古底部流状态，其流动方向为西西南/西南西南，与沉积波迁移的方向相同。预计古底部洋流将具有非常特殊的流动状态，1 < Fr 对解释的沉积波负责的最可能的传输因子是古底部流状态，其流动方向为西西南/西南西南，与沉积波迁移的方向相同。然后预计古底部洋流具有非常特殊的流动状态，1 < Fr 对解释的沉积波负责的最可能的传输因子是古底部流状态，其流动方向为西西南/西南西南，与沉积波迁移的方向相同。预计古底部洋流将具有非常特殊的流动状态，1 < Fr_max  < 2 并且可能源自从大陆架层叠的沿岸水流、刚果峡谷远端溢流、破坏内波或这些过程的混合。