布里恩茨湖(瑞士)的水下地貌和三角洲动力学:对高山地区沉积物收支的影响。

IF 1.8 2区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Swiss Journal of Geosciences Pub Date : 2021-01-01 Epub Date: 2021-12-20 DOI:10.1186/s00015-021-00399-1
Stefano C Fabbri, Isabel Haas, Katrina Kremer, Danae Motta, Stéphanie Girardclos, Flavio S Anselmetti
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引用次数: 3

摘要

非侵入性技术,如地震调查和高分辨率多波束声纳,极大地提高了我们对湖泊和海洋领域的地貌和沉积制度的理解。然而,只有少数研究提供了湖泊流域宽泥沙收支的量化。在这里,我们使用高分辨率水深测绘和地震反射数据相结合来量化高山湖的沉积物收支。布里恩茨湖的新测深数据揭示了三个不同的地貌区域:带有夹层梯田的斜坡、平坦的盆地平原和具有水下水道系统的三角洲地区。准四维地震反射资料对该湖泊进行了泥沙收支,15年来总输沙量为5.54 × 106 t,其中四分之三沉积在盆地平原。布里恩茨湖在盆地平原的沉积速率非常高,为3.0厘米/年,远高于瑞士其他湖泊。这可以解释为:(i)它作为高高山流域的第一个沉积汇的作用,以及(ii)它的水下通道复合体的形态允许沉积物从湖泊的近端到远端有效转移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Subaqueous geomorphology and delta dynamics of Lake Brienz (Switzerland): implications for the sediment budget in the alpine realm.

Subaqueous geomorphology and delta dynamics of Lake Brienz (Switzerland): implications for the sediment budget in the alpine realm.

Subaqueous geomorphology and delta dynamics of Lake Brienz (Switzerland): implications for the sediment budget in the alpine realm.

Subaqueous geomorphology and delta dynamics of Lake Brienz (Switzerland): implications for the sediment budget in the alpine realm.

Non-invasive techniques such as seismic investigations and high-resolution multibeam sonars immensely improved our understanding of the geomorphology and sediment regimes in both the lacustrine and the marine domain. However, only few studies provide quantifications of basin wide-sediment budgets in lakes. Here, we use the combination of high-resolution bathymetric mapping and seismic reflection data to quantify the sediment budget in an alpine lake. The new bathymetric data of Lake Brienz reveal three distinct geomorphological areas: slopes with intercalated terraces, a flat basin plain, and delta areas with subaquatic channel systems. Quasi-4D seismic reflection data allow sediment budgeting of the lake with a total sediment input of 5.54 × 106 t sediment over 15 years of which three-quarter were deposited in the basin plain. Lake Brienz yields extraordinarily high sedimentation rates of 3.0 cm/yr in the basin plain, much more than in other Swiss lakes. This can be explained by (i) its role as first sedimentary sink in a high-alpine catchment, and by (ii) its morphology with subaquatic channel-complexes allowing an efficient sediment transfer from proximal to distal areas of the lake.

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来源期刊
Swiss Journal of Geosciences
Swiss Journal of Geosciences 地学-地质学
CiteScore
4.50
自引率
12.90%
发文量
21
审稿时长
>12 weeks
期刊介绍: The Swiss Journal of Geosciences publishes original research and review articles, with a particular focus on the evolution of the Tethys realm and the Alpine/Himalayan orogen. By consolidating the former Eclogae Geologicae Helvetiae and Swiss Bulletin of Mineralogy and Petrology, this international journal covers all disciplines of the solid Earth Sciences, including their practical applications. The journal gives preference to articles that are of wide interest to the international research community, while at the same time recognising the importance of documenting high-quality geoscientific data in a regional context, including the occasional publication of maps.
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