The role of liquefaction in the evolution of shallow submarine canyon heads from a geotechnical perspective: A case study of the Garrucha Canyon (SE Mediterranean)

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology Pub Date : 2024-09-11 DOI:10.1016/j.margeo.2024.107397

J. Nespereira , D. Casas , M. Yenes , S. Monterrubio , D. Casalbore , N. López-González , B. Alonso , M.E Martín , R. Ruiz , A. Tijera , S. Lafuerza , J. Llopart

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引用次数: 0

Abstract

This work aims to establish the role of liquefaction in a shallow submarine environment defined by a canyon head reaching the coast. The study area is the Garrucha submarine canyon head, which is located in the western Mediterranean Sea.

The potential of liquefaction is approached empirically by two methods in parallel, undrained cyclic direct simple shear (UCDSS) test and piezocone penetration test (CPTu) analyses. For both approaches, considering the regional earthquake records, a cyclic load linked to Mw ≤ 6.5 earthquake events or a maximum ground surface acceleration a_max of 0.25 g is considered.

The sediment samples analysed are nonplastic sands with low silt/clay contents and can be defined as liquefiable. Geotechnical analysis reveals a high probability of triggering liquefaction in this kind of sediment at depths greater than 3 m below the seafloor. CPTu records are used to assess and improve the liquefaction model for the study area by defining 3 different stratigraphic configurations or liquefiable conditions: uniformly liquefiable, interbedded liquifiable and nonliquefiable.

This work highlights the importance of liquefaction—a process normally underestimated in submarine environments—in the downslope transport of sediment from the upper part of a canyon and, more generally, in canyon head evolution with different potential morphosedimentary consequences.

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从岩土工程角度看液化在浅层海底峡谷头演变过程中的作用：加鲁查峡谷（地中海东南部）案例研究

这项研究旨在确定液化在峡谷顶端到达海岸的浅海海底环境中的作用。研究区域是位于地中海西部的加鲁查（Garrucha）海底峡谷头。液化的可能性是通过两种并行的方法，即不排水循环直接单剪（UCDSS）试验和压陷穿透试验（CPTu）分析，根据经验得出的。在这两种方法中，考虑到区域地震记录，循环载荷与 Mw ≤ 6.5 地震事件或 0.25 g 的最大地表加速度 amax 相关联。岩土工程分析表明，在海底以下 3 米以上的深度，这类沉积物引发液化的可能性很高。CPTu 记录用于评估和改进研究区域的液化模型，定义了 3 种不同的地层结构或可液化条件：均匀可液化、层间可液化和不可液化。这项工作强调了液化--通常在海底环境中被低估的过程--在峡谷上部沉积物的下坡运移中的重要性，更广泛地说，是在峡谷头演变中的重要性，其潜在的形态沉积后果各不相同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine Geology 地学-地球科学综合

CiteScore

6.10

自引率

6.90%

发文量

175

审稿时长

21.9 weeks

期刊介绍： Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.