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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Subaquatic slope instabilities: The aftermath of river correction and artificial dumps in Lake Biel (Switzerland)
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Subaquatic slope instabilities: The aftermath of river correction and artificial dumps in Lake Biel (Switzerland)

机译：下坡稳定性：河流勘方和瑞士湖（瑞士）的河流修正和人工转储的后果

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摘要

River engineering projects are developing rapidly across the globe, drastically modifying water courses and sediment transfer. Investigation of the impact of engineering works focuses usually on short-term impacts, thus a longer-term perspective is still missing on the effects that such projects have. The 'Jura Water Corrections' - the largest river engineering project ever undertaken in Switzerland - radically modified the hydrological system of Lake Biel in the 19th and 20th Century. The deviation of the Aare River into Lake Biel more than 140 years ago, in 1878, thus represents an ideal case study to investigate the long-term sedimentological impacts of such large-scale river rerouting. Sediment cores, along with new high-resolution bathymetric and seismic reflection datasets were acquired in Lake Biel to document the consequences of the Jura Water Corrections on the sedimentation history of Lake Biel. Numerous subaquatic mass transport structures were detected on all of the slopes of the lake. Notably, a relatively large mass transport complex (0 center dot 86 km(2)) was observed on the eastern shore, along the path of the Aare River intrusion. The large amount of sediment delivered by the Aare River since its deviation into the lake likely caused sediment overloading resulting in subaquatic mass transport. Alternatively, the dumping since 1963 in a subaquatic landfill of material excavated during the second phase of river engineering, when the channels flowing into and out of Lake Biel were widened and deepened, might have triggered the largest mass transport, dated to 1964 or 1965. Additional potential triggers include two nearby small earthquakes in 1964 and 1965 (M-W 3 center dot 9 and 3 center dot 2, respectively). The data for this study indicate that relatively large mass transports have become recurrent in Lake Biel following the deviation of the Aare River, thus modifying hazard frequency for the neighbouring communities and infrastructure.
机译：河流工程项目正在全球迅速发展，急剧修改水课程和沉积物转移。调查工程工程的影响侧重于短期影响，因此仍然缺少这些项目的效果的长期观点。 “汝拉水修正” - 瑞士中有史以来最大的河流工程项目 - 自然修改了19世纪和20世纪湖博士水文体系。 1878年，1878年，Aare河进入Biel Lake Biel的偏差是调查这种大型河流重新排出的长期沉积学影响的理想案例研究。沉积物核心以及新的高分辨率碱基和地震反射数据集是在湖中获得的，以记录汝拉水校正对Biel湖泊沉降史的后果。在湖的所有斜坡上检测到许多术管传输结构。值得注意的是，在东岸观察到沿着AARE河流入侵的道路，观察到相对大的大规模运输复合体（0中心点86km（2））。 AARE河流偏离其进入湖泊的大量沉积物可能导致沉积物过载导致沉积物过载。或者，自1963年以来的倾销在河流工程的第二阶段挖掘出来的物质填埋场，当流入BIEL湖的渠道加宽和加深时，可能会引发最大的大规模运输，日期为1964年或1965年。额外的潜在触发包括1964年和1965年的附近的两个小地震（分别为MW 3中心点9和3中心点2）。本研究的数据表明，在AARE河偏离偏离AARE河流之后，在湖泊湖中，相对较大的大规模运输已经在湖泊中转发，从而修改邻近社区和基础设施的危险频率。

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