Effects of vegetation in improving slope stability can be recognized on both hydrological andmechanical mechanisms. With regard to the hydrological effect, vegetation leads to lower porewaterpressure and soil moisture due to interception by foliage of rainfall, which reduces the amount ofwater available for infiltration, or uptake by root system of soil moisture. With regard to themechanical aspects, root system, due to their tensile strength and frictional or adhesive properties,reinforce the soil and thus increase the resistance of soil. This mechanical effect is at times the mostsignificant and in slope stability analysis is taken into account by means of the apparent rootcohesion. Some root reinforcement models existing in literature are capable to estimate the apparentroot cohesion as a function of vegetation properties and spatial distribution of the roots in soil interm of root area ratio.In the present study the effects of vegetation on slope stability by modeling both the hydrologicalmechanisms and the root tensile strength are investigated. The model used is the landslidecomponent of the eco-hydrological model, tRIBS-VEGGIE (Triangulated Irregular Network (TIN)-based Real-time Integrated Basin Simulator with VEGetation Generator for Interactive Evolution)capable to evaluate vegetation dynamics and predict shallow landslides. The selected study area isthe Mameyes basin, located in the Luquillo Experimental Forest (Puerto Rico), where other slopestability analysis were carried out with the same model.
|Numero di pagine||0|
|Stato di pubblicazione||Published - 2012|