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

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>

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

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