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Rheological characteristics of marine sediments from the Ulleung Basin, East Sea to estimate the mobility of submarine landslides

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Abstract

In estimating the geohazards posed by submarine landslides, the rheological properties of marine sediments are of significant importance for their postfailure dynamics. We report an experimental study of the rheological behavior of marine sediments taken from the Ulleung Basin, East Sea and their influence on numerical simulations of debris flow runout. Marine sediments exhibit a typical yield stress behavior, such as that of low-activity clays. For the materials examined, different yield stresses are observed depending on the shearing methods. Steady-state and oscillatory shear tests were conducted for different volumetric concentrations of sediment. According to the test results, the Bingham yield stresses under controlled shear stress and shear rate range from approximately 100 Pa to 1500 Pa, but the yield stresses under oscillatory shear loads range from approximately 25 Pa to 3500 Pa for a given sediment concentration. In the latter cases, the value obtained in the elastic region is approximately doubled. Experiments under steady-state and oscillatory shear loads can be helpful in determining the yield points in the elastic and viscous regions and in explaining changes in the structure of the soil sample due to shear. We apply the range of measured yield strength values to numerical simulations of debris flow runout using a Herschel-Bulkley model and find that only the lowest values of yield strength, despite the low sediment concentrations, could account for the observed runout and thickness distribution. We infer that significant wetting must occur during debris flow motion to attain the observed runout.

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Acknowledgements

This research was supported by the KIGAM research project (21-3412-1; 21-9851). Special thanks for the research project entitled “Study on submarine active faults and evaluation of the possibility of submarine earthquakes in the southern part of the East Sea, Korea”. Many thanks for CSIC research funding. This work acknowledges the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S).

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Conceptualization, SWJ and RU; Soil sampling, JJB, GSL and DGY; Field investigation, JJB, GSL and DGY; Methodology and Analysis, SWJ and RU; Writing—original draft, SWJ and RU; Writing—review & editing, SWJ and RU.

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Correspondence to Sueng-Won Jeong.

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Jeong, SW., Urgeles, R., Bahk, JJ. et al. Rheological characteristics of marine sediments from the Ulleung Basin, East Sea to estimate the mobility of submarine landslides. Mar Geophys Res 43, 16 (2022). https://doi.org/10.1007/s11001-022-09473-1

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  • DOI: https://doi.org/10.1007/s11001-022-09473-1

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