1887

Abstract

Summary

Climate change threatens flood embankment stability by intensifying flood frequency and severity while possibly accelerating material deterioration through greater cyclic forcing. The material types, often unknown, must be mapped to identify areas at risk of deterioration. This study uses geophysical and geotechnical techniques to examine a clay flood embankment on the River South Tyne in the UK. Geophysical methods, including MASW, ERT, and EMI, were deployed along the embankment, co-located with CPTs. The EMI, on the riverside toe was able to locate a previous failure that scoured a hole in the foundation strata. The ERT and MASW categorise the site into three broad units. 1) The embankment fill a lower resistivity, and higher S-wave velocity, indicating well-compacted silts and clay. 2) Upper embankment foundation, lower resistivities and S-wave velocities, suggesting poorly compacted silts and clay. 3) Lowest layer of higher resistivities and S-wave velocities, likely sands and gravels. A qualitative comparison with the CPT results shows a good correlation with the upper two units. Additionally, the boundary between two and three is often marked by the refusal depth of the CPT. Further work aims to quantitatively compare and combine the datasets to create a single ground model of the site.

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2023-09-03
2025-12-05

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Multi-Scale Characterisation of a Clay Flood Embankment, Warden, Northumberland
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202320210
/content/papers/10.3997/2214-4609.202320210
/content/papers/10.3997/2214-4609.202320210
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