An experimental investigation on suction influence zone induced by plant transpiration

K.X. Woon, A.K. Leung, C.W.W. Ng, L.M. Chu, B.C.H. Hau

    Research output: Chapter in Book/Report/Conference proceedingChapter


    Extensive research works were conducted in the past utilizing plant roots and stems as slope stabilisation elements by means of mechanical reinforcement. However, hydrological benefits provided by plant-induced suction through transpiration are often overlooked. The objective of this study is to measure and identify any suction influence zone induced by bermudagrass (Cynodon dactylon) in completely decomposed granite (CDG; silty sand) in laboratory. The CDG was compacted in a rectangular test box at a degree of compaction of 80% and the grass was allowed to germinate on the soil surface. The test box was instrumented with heat dissipation marric water potential sensors, which allow marric suction up to 350kPa to be measured indirectly. The setup was placed in a plant room, where atmospheric conditions such as temperature, solar energy and relative humidity were controlled and measured. For comparison purposes, a control experiment (without vegetation), which has an identical experimental setup, was performed. Variations of marric suction between the vegetated and bare specimens were measured and compared. Any grass-induced suction influence zone was identified, in terms of magnitude and distribution.
    Original languageEnglish
    Title of host publication5th Asia-Pacific Conference on Unsaturated Soils 2012
    Subtitle of host publicationUnsaturated soils : theory and practice
    EditorsApiniti Jotisankasa, Auckpath Sawangsuriya, Suttisak Soralump, Warakorn Mairaing
    Place of PublicationThailand
    PublisherKasetsart University
    Number of pages6
    ISBN (Print)9786167522777
    Publication statusPublished - 2012
    Event5th Asia-Pacific Conference on Unsaturated Soils 2011 - Pattaya, Thailand
    Duration: 29 Feb 20122 Mar 2012


    Conference5th Asia-Pacific Conference on Unsaturated Soils 2011


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