An evaluation of combined geophysical and geotechnical methods to characterize beach thickness
An evaluation of combined geophysical and geotechnical methods to characterize beach thickness
复制标题
结合地球物理和岩土工程方法来表征海滩厚度的评估
DOI：
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发表时间：
2006
影响因子：
1.4
通讯作者：
W.H. Tinsley
中科院分区：
文献类型：
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作者：
D. Gunn;S. Pearson;J. Chambers;L. M. Nelder;J.R. Lee;D. Beamish;J. Busby;R. Tinsley;W.H. Tinsley
海滩提供沉积物储存，并在开发海岸线以应对气候变化方面发挥重要作用。需要对海滩厚度和体积进行量化，以评估沿海泥沙输送预算。因此，在环境敏感性排除了侵入性方法的情况下，需要便携式、快速、非侵入性技术来评估厚度。描述了基于电气、电磁、地震和机械技术的工具箱的现场方法和数据，这些技术在约克郡伊辛顿的一个沿海现场进行了评估。地球物理和岩土性质取决于海滩的含水率、孔隙度和岩性以及海滩-平台界面的形态。厚度解释使用廉价的地理信息系统来整合数据，从而使这些控制和关系得以理解。基于此案例历史，包括程序和技术的有效现场实践的指导方针是使用系统的方法提出的。现场结果表明，砂砾混合海滩是高度多变的，在模型中不能表示为覆盖在基岩半空间上的厚度可变的均质层。
Beaches provide sediment stores and have an important role in the development of the coastline in response to climate change. Quantification of beach thickness and volume is required to assess coastal sediment transport budgets. Therefore, portable, rapid, non-invasive techniques are required to evaluate thickness where environmental sensitivities exclude invasive methods. Site methods and data are described for a toolbox of electrical, electromagnetic, seismic and mechanical based techniques that were evaluated at a coastal site at Easington, Yorkshire. Geophysical and geotechnical properties are shown to be dependent upon moisture content, porosity and lithology of the beach and the morphology of the beach–platform interface. Thickness interpretation, using an inexpensive geographic information system to integrate data, allowed these controls and relationships to be understood. Guidelines for efficient site practices, based upon this case history including procedures and techniques, are presented using a systematic approach. Field results indicated that a mixed sand and gravel beach is highly variable and cannot be represented in models as a homogeneous layer of variable thickness overlying a bedrock half-space.