Skip to Main content Skip to Navigation
Journal articles

Control of Tropical Landcover and Soil Properties on Landslides’ Aquifer Recharge, Piezometry and Dynamics

Abstract : Among the processes controlling landslide dynamics, piezometry plays a major role. The characterization of a landslide's aquifer recharge (=inflows) is thus indispensable for predicting displacements. In this research, the recharge of the large Grand Ilet landslide in the humid tropical, Reunion Island was characterized through a multidisciplinary and robust hydrological approach, notably comprising a precise water budget of the landslide (outflows = inflows). Surface processes play a major role in the landslide recharge regime. Runoff is less than 1% of rainfall (2400 mm/year) due to the soil's high permeability. A large quantity of water (250 mm) is adsorbed in this shallow layer. This reservoir is submitted to high real evapotranspiration (1500 mm/year) due to the dense tropical broad-leaved vegetation. This explains the low aquifer recharge (860 mm/year), the fact that only major rainfall episodes during the rainy season induce recharge, with a consequent increase in landslide velocity, and finally low outflow from the landslide. Therefore, among other operational recommendations, it is necessary to maintain natural vegetation cover over such landslide surface in order to limit aquifer recharge and thus displacements. This study provides a methodological framework for landslide studies, particularly for modeling their recharge/piezometry, and key parameters of their dynamics.
Complete list of metadatas

Cited literature [89 references]  Display  Hide  Download

https://hal.univ-reunion.fr/hal-02100498
Contributor : Réunion Univ <>
Submitted on : Wednesday, September 11, 2019 - 6:48:35 AM
Last modification on : Tuesday, June 30, 2020 - 10:30:25 AM
Long-term archiving on: : Saturday, February 8, 2020 - 12:22:10 AM

File

water-10-01491-v2.pdf
Files produced by the author(s)

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Pierre Belle, Bertrand Aunay, Patrick Lachassagne, Bernard Ladouche, Jean-Lambert Join. Control of Tropical Landcover and Soil Properties on Landslides’ Aquifer Recharge, Piezometry and Dynamics. Water, MDPI, 2018, 10 (10), pp.1491. ⟨10.3390/w10101491⟩. ⟨hal-02100498⟩

Share

Metrics

Record views

140

Files downloads

131