Slope Stability of Europe`s Passive Continental Margins; Subproject of the ESF-Euromargins project

欧洲被动大陆边缘的坡度稳定性；

• 批准号: 5389419
• 负责人: Professor Dr. Rüdiger Stein
• 金额: --
• 依托单位: International Centre for Geohazards (aufgelöst)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5389419?language=en
• 关键词: Slope; Stability; Europe; Passive; Continental

Improved knowledge of the past and better understanding of the present seabed stability are essential for an understanding of the sediment dynamics of the European continental margins as a whole. Submarine slides are common and very effective mechanisms of sediment transfer from shelf and upper slope to deep-sea basins. During one single event enormous sediment volumes can be transported on very gentle slopes over distances exceeding hundreds of kilometres. Typically such events can last from less than an hour to days as documented by the 1992 Grand Banks submarine slide event that also created a tsunami, which caused devastation on adjacent coastal lowlands. In this multidisciplinary international project coordinated by Prof. Dr. J. Mienert (University of Tromso, Norway) we focus on systematic advancement in our understanding of sediment dynamics of submarine slides in the context of global change. We prioritise the research objectives (1) slide headwall development on upper continental slopes, (2) slope stability of river-fed and carbonate margins, (3) slope stability of glacier-fed siliciclastic margins, (4) geo-mechanical controls on the formation and trigger mechanisms of submarine slides, (5) numerical modelling of sediment break up, mobility and run out, and (6) slide frequencies in regions of long-term instability in relation to sea-level change. Within the subproject we concentrate on stratigraphical, sedimentological and geochemical investigations of sediment cores from the northern Svalbard continental margin / Yermac Area (Arctic Ocean). The overall interest is to identify the sediment characteristics of slides, to study their frequency and its relationship to climate change, and to quantify the sediment transfer from the shelf and upper slope to the deep-sea basin.

增进对过去的了解和更好地了解目前的海底稳定性，对于了解整个欧洲大陆边的沉积动态至关重要。海底滑动是沉积物从陆架和陆坡向深海盆地迁移的常见和非常有效的机制。在一次事件中，巨大的沉积物量可以在非常平缓的斜坡上移动数百公里。通常情况下，这种事件可以持续不到一个小时到几天，如1992年大浅滩海底滑坡事件所记录的那样，该事件还造成了海啸，对邻近的沿海低地造成了破坏。在这个由J. Mienert教授（挪威特罗姆瑟大学）协调的多学科国际项目中，我们专注于在全球变化背景下对海底滑坡沉积动力学的理解方面取得系统性进展。我们优先考虑的研究目标是：（1）上大陆斜坡上的滑动端墙发展，（2）河流和碳酸盐边缘的斜坡稳定性，（3）冰川硅质边缘的斜坡稳定性，（4）海底滑坡形成和触发机制的地质力学控制，（5）沉积物破碎，流动和流失的数值模拟，（6）与海平面变化有关的长期不稳定区域的滑动频率。在该分项目内，我们集中对斯瓦尔巴特群岛北方大陆边缘/耶尔马克地区（北冰洋）的沉积物岩心进行地层学、沉积学和地球化学调查。总的目的是查明滑坡的沉积特征，研究滑坡的频率及其与气候变化的关系，并量化沉积物从大陆架和上斜坡向深海盆地的转移。