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Analysis of plant root-induced preferential flow and pore-water pressure variation by a dual-permeability model

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10370195" target="_blank" >RIV/00216208:11310/17:10370195 - isvavai.cz</a>

  • Výsledek na webu

    <a href="http://dx.doi.org/10.1139/cgj-2016-0629" target="_blank" >http://dx.doi.org/10.1139/cgj-2016-0629</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1139/cgj-2016-0629" target="_blank" >10.1139/cgj-2016-0629</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Analysis of plant root-induced preferential flow and pore-water pressure variation by a dual-permeability model

  • Popis výsledku v původním jazyce

    Vegetation can affect slope hydrology and stability via plant transpiration and induced matric suction. Previous work suggested that the presence of plant roots would induce preferential flow, and its effects may be more significant when the planting density is high. However, there is a lack of numerical studies on how planting density affects soil pore-water pressure and shear strength during heavy rainfall. This study aims to investigate the impact of plant root-induced preferential flow on hydromechanical processes of vegetated soils under different planting densities. Two modelling approaches, namely single-and dual-permeability models, were integrated with an infinite slope stability approach to simulate pore-water pressure dynamics and slope stability. Laboratory tests on soils with two different planting densities for a plant species, Schefflera heptaphylla, were conducted for numerical simulations. The single-permeability model overestimated the pore-water pressure in shallow soil and underestimated the infiltration depth. The dual-permeability model, which is able to model the effects of preferential flow, can better capture the observations of rapid increase of pore-water pressure and deeper pressure response in the vegetated soil. However, caution should be taken on the choice of pore-water pressure when using the dual-permeability model to assess the factor of safety. The dual-permeability model using the pore-water pressure in the preferential flow domain and that in the matrix domain would result in a lower and higher factor of safety, respectively.

  • Název v anglickém jazyce

    Analysis of plant root-induced preferential flow and pore-water pressure variation by a dual-permeability model

  • Popis výsledku anglicky

    Vegetation can affect slope hydrology and stability via plant transpiration and induced matric suction. Previous work suggested that the presence of plant roots would induce preferential flow, and its effects may be more significant when the planting density is high. However, there is a lack of numerical studies on how planting density affects soil pore-water pressure and shear strength during heavy rainfall. This study aims to investigate the impact of plant root-induced preferential flow on hydromechanical processes of vegetated soils under different planting densities. Two modelling approaches, namely single-and dual-permeability models, were integrated with an infinite slope stability approach to simulate pore-water pressure dynamics and slope stability. Laboratory tests on soils with two different planting densities for a plant species, Schefflera heptaphylla, were conducted for numerical simulations. The single-permeability model overestimated the pore-water pressure in shallow soil and underestimated the infiltration depth. The dual-permeability model, which is able to model the effects of preferential flow, can better capture the observations of rapid increase of pore-water pressure and deeper pressure response in the vegetated soil. However, caution should be taken on the choice of pore-water pressure when using the dual-permeability model to assess the factor of safety. The dual-permeability model using the pore-water pressure in the preferential flow domain and that in the matrix domain would result in a lower and higher factor of safety, respectively.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10508 - Physical geography

Návaznosti výsledku

  • Projekt

  • Návaznosti

    S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2017

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    Canadian Geotechnical Journal

  • ISSN

    0008-3674

  • e-ISSN

  • Svazek periodika

    54

  • Číslo periodika v rámci svazku

    11

  • Stát vydavatele periodika

    CA - Kanada

  • Počet stran výsledku

    16

  • Strana od-do

    1537-1552

  • Kód UT WoS článku

    000413922000003

  • EID výsledku v databázi Scopus

    2-s2.0-85032663625