Integrated experiments on field monitoring and hydro-mechanical modeling for determination of a triggering threshold of rainfall-induced shallow landslides. A case study in Ren River catchment, China
Integrated experiments on field monitoring and hydro-mechanical modeling for determination of a triggering threshold of rainfall-induced shallow landslides. A case study in Ren River catchment, China
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现场监测和水力模拟综合实验确定降雨诱发浅层滑坡的触发阈值。
DOI：
10.1007/s10064-019-01570-7
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发表时间：
2019-07
影响因子：
4.2
通讯作者：
Jun Li
中科院分区：
文献类型：
--
作者：
Xinsheng Wei;Wen Fan;Yanbo Cao;Xiaoqing Chai;Massimiliano Bordoni;Claudia Meisina;Jun Li
了解滑坡的水文机制，对于进行可靠的预测评估，减少经济损失和人员伤亡的风险至关重要。将野外水文监测资料与水文力学分析相结合，可以更好地了解浅层土壤的季节性水文特征和降雨诱发浅层滑坡的触发机制，从而建立完善的滑坡预警系统。水文监测系统的一个代表性的斜坡，是经历了频繁的局部浅层故障在仁河流域建成提供可用的季节性水文功能，在浅层土壤中的体积含水量和孔隙水压力的时间趋势。由于饱和度和相关孔隙压力随垂直深度而变化，因此已完全检测到垂直向下流从非饱和状态向近饱和状态的过渡。因此，浅层滑坡的触发机制应与上部非饱和区基质吸力消散和较深饱和区临时高位水位产生的正孔隙压力增加的综合效应有关。通过野外实测和一维水文模型的反演分析，证实了这一过程。先前的水文条件也被发现有影响的降雨强度持续时间阈值的滑坡预警系统的基础上的水力机械分析，以提高模型的预测能力的准确性。研究结果表明，本研究在捕捉滑坡真实的水文特征的基础上，通过水力学分析，提高了滑坡预警系统的有效性。
Understanding the hydrological mechanism of rainfall-induced shallow landslides is critical to make reliable predictive assessments and to reduce risks of economic loss and fatalities. An integrated approach was identified by combining the field-based monitored hydrological data with a hydro-mechanical analysis, which can be utilized to better understand seasonal hydrological features in shallow soils and the corresponding triggering mechanism of rainfall induced shallow landslides, with the aim of.setting up an improved landslide early warning system. A hydrological monitoring system on a representative slope that was experiencing frequent local shallow failures in the Ren River catchment was constructed to provide available seasonal hydrological features with regard to time trends in volumetric water content and pore water pressure in shallow soils. A transition of vertical downward flow from unsaturated to near-saturated conditions has been fully detected since the significant saturation degree and associated pore pressure varies with vertical depths. Consequently, the triggering mechanism of shallow landslides should be associated with the combined effects of dissipation of matrix suction in the upper unsaturated zone and increased positive pore pressure due to the generation of a temporal perched water table in the deeper saturated zone. This process was confirmed through the field evidence and a back analysis on the long-term hydrological evolution of slope soil using a calibrated one-dimensional hydrological model. Antecedent hydrological conditions were also found to have an effect on rainfall intensity–duration thresholds in the landslide early warning system based on a hydro-mechanical analysis, with the aim of improving the accuracy of the model’s predictive ability. The results indicated that this research promoted the effectiveness of a landslide early.warning system through a hydro-mechanical analysis based on capturing the real hydrological features of a landslide.
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DOI：
10.1061/(asce)1090-0241(2004)130:4(362
发表时间：
2004-04-01
影响因子：
3.9
作者：
Collins, BD;Znidarcic, D
通讯作者：
Znidarcic, D
影响因子：
3.9
作者：
M. Bittelli;R. Valentino;F. Salvatorelli;P. Pisa
通讯作者：
M. Bittelli;R. Valentino;F. Salvatorelli;P. Pisa
DOI：
10.1063/1.3128494
发表时间：
2014-02
期刊：
--
影响因子：
--
作者：
J. Monteith;W. E. Reifsnyder
通讯作者：
J. Monteith;W. E. Reifsnyder
影响因子：
7.4
作者：
Damiano, E.;Olivares, L.;Picarelli, L.
通讯作者：
Picarelli, L.
影响因子：
6.3
作者：
Greco, R.;Comegna, L.;Picarelli, L.
通讯作者：
Picarelli, L.