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Morphology of small-scale submarine mass movement events across the northwest United Kingdom
Geomorphology ( IF 3.1 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.geomorph.2020.107282
Gareth D.O. Carter , Rhys Cooper , Joana Gafeira , John A. Howe , David Long

Abstract A review of multibeam echo sounder (MBES) survey data from five locations around the United Kingdom northwest coast has led to the identification of a total of 14 separate subaqueous mass movement scars and deposits within the fjords (sea lochs) and coastal inlets of mainland Scotland, and the channels between the islands of the Inner Hebrides. In these areas, Quaternary sediment deposition was dominated by glacial and glaciomarine processes. Analysis of the morphometric parameters of each submarine mass movement has revealed that they fall into four distinct groups of subaqueous landslides; Singular Slumps, Singular Translational, Multiple Single-Type, and Complex (translational & rotational) failures. The Singular Slump Group includes discrete, individual subaqueous slumps that exhibit no evidence of modification through the merging of several scars. The Singular Translational Group comprise a single slide that displays characteristics associated with a single translational (planar) failure with no merging of multiple events. The Multiple Single-Type Group incorporates scars and deposits that displayed morphometric features consistent with the amalgamation of several failure events of the same type (e.g. debris flows or slumps). Finally, the Complex (translational & rotational) Group comprises landslides that exhibited complex styles of failures, including both translational and rotational mechanisms controlling the same slide. The submarine mass movements that comprise this dataset are then discussed in relation to global fjordic and glaciomarine nearshore settings, and slope failure trigger mechanisms associated with these environments are described with tentative links to individual submarine landslides from the database, where appropriate. It is acknowledged that additional MBES data are needed not only to expand this database, but also in order to create a more statistically robust study. However, this initial study provides the basis for a much wider investigation of subaqueous mass movements and correlations between their morphometric parameters.

中文翻译:

英国西北部小规模潜艇群众运动事件的形态学

摘要 对来自英国西北海岸周围五个地点的多波束回声测深仪 (MBES) 调查数据的审查导致在大陆的峡湾(海湖)和沿海入口内确定了总共 14 个独立的水下物质运动疤痕和沉积物。苏格兰和内赫布里底群岛之间的航道。在这些地区,第四纪沉积物沉积以冰川和冰海相沉积过程为主。对每个海底大规模运动的形态测量参数的分析表明,它们分为四个不同的水下滑坡组;单一坍落度、单一平移、多个单一类型和复杂(平移和旋转)故障。奇异坍落度组包括离散的、单个水下塌陷,没有显示出通过合并几个疤痕而改变的证据。Singular Translational Group 包含一张幻灯片,该幻灯片显示与单个平移(平面)故障相关的特征,而不合并多个事件。Multiple Single-Type Group 结合了疤痕和沉积物,这些痕迹和沉积物的形态特征与同一类型的几个破坏事件(例如泥石流或坍塌)的合并一致。最后,复杂(平移和旋转)组包括表现出复杂故障类型的滑坡,包括控制同一滑坡的平移和旋转机制。然后讨论与全球峡湾和冰川近岸环境相关的包含该数据集的海底大规模运动,与这些环境相关的斜坡破坏触发机制在适当的情况下通过与数据库中单个海底滑坡的临时链接进行描述。众所周知,不仅需要额外的 MBES 数据来扩展该数据库,而且还需要创建更具统计学意义的研究。然而,这项初步研究为更广泛地研究水下物质运动及其形态测量参数之间的相关性奠定了基础。
更新日期:2020-09-01
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