Field study of rainfall infiltration into a grassed unsaturated expansive soil slope

Zhan, Tony L. T.; Ng, Charles W. W.; Fredlund, D G

doi:10.1139/t07-001

Cited by 137 publications

(59 citation statements)

References 14 publications

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“…On the contrary, the SLIP model bypasses the transient analysis, assuming the formation, in consequence of a rainfall event, of the final condition of a perched water table, over the specified depth of slope failure. Furthermore, from a stability analysis perspective, the TRIGRS model does not take into account groundwater flow parallel to the slope, thus, neglecting the destabilizing filtration force (Zhan et al, 2007), which instead is correctly taken into account in the SLIP model. 5 Models application and input parameters on a regional scale…”

Section: Peculiarities Of Slip and Trigrsmentioning

confidence: 99%

Towards a real-time susceptibility assessment of rainfall-induced shallow landslides on a regional scale

Montrasio

Valentino

Losi

2011

Nat. Hazards Earth Syst. Sci.

114

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Abstract. In the framework of landslide risk management, it appears relevant to assess, both in space and in time, the triggering of rainfall-induced shallow landslides, in order to prevent damages due to these kind of disasters. In this context, the use of real-time landslide early warning systems has been attracting more and more attention from the scientific community. This paper deals with the application, on a regional scale, of two physically-based stability models: SLIP (Shallow Landslides Instability Prediction) and TRIGRS (Transient Rainfall Infiltration and Grid-based Regional Slope-stability analysis). A back analysis of some recent case-histories of soil slips which occurred in the territory of the central Emilian Apennine, Emilia Romagna Region (Northern Italy) is carried out and the main results are shown. The study area is described from geological and climatic viewpoints. The acquisition of geospatial information regarding the topography, the soil properties and the local landslide inventory is also explained.The paper outlines the main features of the SLIP model and the basic assumptions of TRIGRS. Particular attention is devoted to the discussion of the input data, which have been stored and managed through a Geographic Information System (GIS) platform. Results of the SLIP model on a regional scale, over a one year time interval, are finally presented. The results predicted by the SLIP model are analysed both in terms of safety factor (F s ) maps, corresponding to particular rainfall events, and in terms of time-varying percentage of unstable areas over the considered time interval. The paper compares observed landslide localizations with those predicted by the SLIP model. A further quantitative comparison between SLIP and TRIGRS, both applied to the Correspondence to: R. Valentino (roberto.valentino@unipr.it) most important event occurred during the analysed period, is presented. The limits of the SLIP model, mainly due to some restrictions of simplifying the physically based relationships, are analysed in detail. Although an improvement, in terms of spatial accuracy, is needed, thanks to the fast calculation and the satisfactory temporal prediction of landslides, the SLIP model applied on the study area shows certain potential as a landslides forecasting tool on a regional scale.

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Section: Peculiarities Of Slip and Trigrsmentioning

confidence: 99%

Towards a real-time susceptibility assessment of rainfall-induced shallow landslides on a regional scale

Montrasio

Valentino

Losi

2011

Nat. Hazards Earth Syst. Sci.

114

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“…Studies that focus on relatively young plants found slowing of infiltration (Gish & Jury, 1983;Leung et al, 2015;Jotisankasa & Sirirattanachat, 2017) presumably due to root occupancy of soil pore space, which blocks water flow paths (Scholl et al, 2014;Ng et al, 2016). In contrast, increased infiltration rate is more often reported in mature plants (van Noordwijk et al, 1991;Mitchell et al, 1995;Ng et al, 2017), and is attributable to the formation of (a) root channel related macropores associated with root decay (Ghestem et al, 2011) or (b) desiccation cracks upon drying of medium-to high-plasticity clay (Zhan et al, 2007;Jotisankasa & Sirirattanachat, 2017;Song et al, 2017). The existing research often considered plant effects only at one particular plant age.…”

Section: Introductionmentioning

confidence: 99%

Plant age effects on soil infiltration rate during early plant establishment

et al. 2017

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Infiltration rate affects slope stability by determining the rate of water transport to potential failure planes. This note considers the influences of vegetation (grass and willow) establishment and root growth dynamics on infiltration rate, as related to establishing vegetation on bioengineered slopes. Soil columns of silty sand with and without vegetation were tested by constant-head infiltration tests at 2, 4, 6 and 8 weeks after planting. Infiltration rate increased linearly with plant age and below-ground traits including root biomass and root length density. Infiltration rate for willow-rooted soil was an order of magnitude higher than for fallow soil. The plant age effect was more prominent for willow, which grew faster and with thicker roots than the grass. Illustrative seepage analysis suggests that ignoring the plant age effects could underestimate wetting front advancement to greater depths during rainfall, and underestimate suction recovery at shallow depths during internal drainage.

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“…According to Kormann et al (2016), the equipments selected were based mainly on their applications and history of use in the academic scientific environment and the geotechnical practice of slope monitoring (Dunnicliff, 1988;Silveira, 2006;Dixon and Spriggs, 2007;Eberhardt, 2008), being: inclinometers, piezometers, tensiometers and rain gauge (Lim et al, 1996;Li et al, 2005;Marinho, 2005;Cerqueira, 2006;Zhan et al, 2007;Bonzanigo et al, 2007;Simeoni & Mongiovì, 2007;Leung et al, 2011;Tommasi et al, 2013, Bicalho et al, 2015.…”

Section: Geotechnical Instrumentationmentioning

confidence: 99%

Rainfall Effects on Pore Pressure Changes in a Coastal Slope of the Serra do Mar in Santa Catarina

Acevedo¹,

Passini²,

Kormann³

2017

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Abstract. This research aims to describe how rainfall can cause changes in the piezometric pore pressure and soil matric suction in a densely instrumented slope by the South BR-101 (Brazilian Numbered Highway), in the area of Morro do Boi, in the State of Santa Catarina, South Region of Brazil. The slope presented a history of instability movements instigated by intense rainfall, with debris accumulation on the highway and traffic interruption. The analyzed data are measured by six vibrating wire piezometers and eight electrical tensiometers attached to a datalogger, two conventional slope inclinometers and a rain gauge with an internal datalogger. A total of 2,552 readings corresponding to the vibrating wires and electrical resistance instruments, 29 inclinometers records and 7,143 rainfall records were collected over the first ten months of slope monitoring. The analysis results demonstrated that during the monitoring period there were no heavy rains. Three monitoring periods were identified by the frequency and intensity of rainfalls. The soil pore pressure monitoring instruments showed significant variations in the high frequency period and low intensity rainfall, and little variation in low frequency period and high intensity rainfall, which demonstrates greater runoff and little infiltration during the occurrence of more significant rainfall.

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Field study of rainfall infiltration into a grassed unsaturated expansive soil slope

Cited by 137 publications

References 14 publications

Towards a real-time susceptibility assessment of rainfall-induced shallow landslides on a regional scale

Towards a real-time susceptibility assessment of rainfall-induced shallow landslides on a regional scale

Plant age effects on soil infiltration rate during early plant establishment

Rainfall Effects on Pore Pressure Changes in a Coastal Slope of the Serra do Mar in Santa Catarina

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