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Erodibility in synthetic water repellent soils

Shuang, Zheng, Lourenço, Sérgio D.N, Chui, Tina Fong May, Cleall, Peter ORCID:, Millis, Stuart W. and Ng, Angel K. Y. 2017. Erodibility in synthetic water repellent soils. Presented at: ICSMGE 2017 - 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul; South Korea, 17-22 September 2017.

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ABSTRACT: Fire induced soil water repellency (or hydrophobicity) is a major contributor of post-wildfire debris flow. By altering the hydrological responses of soils, the infiltration rate is significantly reduced and surface runoff is enhanced during rainfall events, leading to the erosion and entrainment of slope surface material, and the subsequent formation of debris flows. Due to their capability of controlling infiltration of rainwater, water repellent soils have been considered to serve as fill materials in engineered slopes, and mitigate rainfall induced slope failures. However, a concern arises that surface overflow and erosion may be enhanced and accelerated on water repellent slopes. A solution for this problem would be water repellent soils with low erodibility, i.e. reducing infiltration without significantly promoting erosion. Flume tests were conducted on two materials: silica sand and completely decomposed granite (CDG). After inducing water repellency and comparing the erosion under rainfall condition, the erodibility of water repellent CDG is found to be much lower than silica sand, implying its potential to mitigate erosion induced by soil water repellency.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Engineering
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Last Modified: 23 Oct 2022 13:36

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