Step-like Landslides Warning Method Based on Feature Point Analysis of Monitoring Curve
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摘要: 在三峡库区专业监测滑坡中,部分滑坡受到库水或者降雨等外界因素影响,其累计位移-时间曲线表现出明显的“阶跃型”特征。直接使用改进切线角对阶跃型滑坡位移监测曲线进行预警分析,其改进切线角预警值可能在变形曲线陡增阶段高于实际预警级别,增加虚警率。为了准确判别阶跃型滑坡的变形阶段及发展趋势,本文以白家包滑坡和谭家湾滑坡为例,分析滑坡监测历史数据及其影响因素,采用斜率单变点分析法和AMPD法对“阶跃型”累计位移-时间曲线进行特征点提取,结合Hill 函数形成特征点拟合曲线,在此基础上利用改进切线角对拟合曲线进行滑坡变形阶段划分及预警分析。结果表明,当前白家包滑坡总体上处于蠕滑变形阶段,预警级别为无预警;谭家湾滑坡处于中加速变形阶段,预警级别为橙色预警。研究表明,本文方法可以很好抑制变形曲线的阶跃特征对预警级别判定带来的影响,更准确地判定滑坡变形阶段。Abstract: Among the landslides monitored in the Three Gorges Reservoir area, some of them are affected by external factors such as reservoir water or rainfall, and significant step-like features are shown in their accumulative displacement-time curves. When the improved tangent angle method is directly used to analyze the step-like landslides displacement monitoring curve for early warning, the warning value of the improved tangent angle may be higher than the actual warning level in the steep increase stage of the deformation curve, increasing the false alarm rate. To accurately determine the deformation stage and development trend of step-like landslides, this paper takes the Baijiabao landslide and Tanjiawan landslide as examples, analyzes the historical data of landslide monitoring and their influencing factors, and adopts the slope single turning point method and the AMPD (automatic multiscale-based peak detection) method to extract points of the cumulative displacement-time curves of the step-like landslides. Combined with the Hill function to form a feature point fitting curve, based on which, using the improved tangent angle, the fitted curve of landslide is divided into different deformation stages and early warning analysis could be conducted. The results show that the Baijiabao landslide is currently in the creep deformation stage generally, and the warning level is no warning. The Tanjiawan landslide is in the medium accelerating deformation stage, with an orange warning level. This study indicates that the method can effectively inhibit the influence on warning levels caused by deformation curves step-like features, and more accurately determine the stage of landslide deformation.
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Key words:
- Three Gorges Reservoir /
- landslide /
- step-like /
- fitting curves /
- monitoring and early warning
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