- Title
- A computationally efficient system for assessing near-real-time instability of regional unsaturated soil slopes under rainfall
- Creator
- Li, Longqi; Ju, Nengpan; He, Chuan; Li, Changlin; Sheng, Daichao
- Relation
- Landslides Vol. 17, Issue 4, p. 893-911
- Publisher Link
- http://dx.doi.org/10.1007/s10346-019-01307-3
- Publisher
- Springer
- Resource Type
- journal article
- Date
- 2020
- Description
- The objective of this paper is to obtain an applicable assessment method and a Web-GIS-based prediction system for regional landslides. The traditional Richards function is reconstructed using the soil-water characteristic curve (SWCC) and the coordinate transformation technique. The analytical pore pressure for a slope model is derived by solving the modified Richard equation via the Green function and Fourier transformation. The obtained transient pore pressure field is then incorporated with Brakensiek's matric suction theory, to build a conceptual model for rainfall-induced shallow landslides. The safety factor is obtained by solving the limit equilibrium equation of the conceptual model. The method is then implemented in a Web-GIS system, considering influence of slope geometry features, geology parent material, and near-real-time rainfall intensity of the study area. It is verified that this method is computationally efficient and reliable for gentle slopes and short rainfall durations. Moreover, an extensive parameter study shows that the two commonly used coefficients in the intensity-duration equation are both correlated to rainfall inter-event time via exponential functions, and rainfall event time via power functions. The primary influential factor for regional landslides is the initial water content, followed by the rainfall duration and intensity, and least by soil thickness.
- Subject
- unsaturated soil slip; rainfall infiltration; near-real-time stability assessment; web-GIS platform
- Identifier
- http://hdl.handle.net/1959.13/1424327
- Identifier
- uon:38056
- Identifier
- ISSN:1612-510X
- Language
- eng
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