多元時(shí)間序列分析的滑坡演化階段劃分
發(fā)布時(shí)間:2018-04-15 03:07
本文選題:滑坡演化 + 多元時(shí)間序列; 參考:《地球科學(xué)》2016年04期
【摘要】:滑坡的時(shí)間-位移曲線一般具有3個(gè)階段特征,即初始變形階段、等速變形階段和加速變形階段,不同演化階段加速度具有不同的變化特點(diǎn).目前往往是依據(jù)對(duì)加速度曲線特征的分析來人為劃分演化階段,缺少相應(yīng)的理論支持和定量計(jì)算.針對(duì)上述問題,選取月降雨量、月庫水位高程變化量對(duì)滑坡的累計(jì)位移建立多因素的時(shí)間序列預(yù)測(cè)模型.然后利用Chow分割點(diǎn)檢驗(yàn)理論,以所建模型中F和LR統(tǒng)計(jì)量最大值點(diǎn)作為分割點(diǎn)對(duì)滑坡演化階段進(jìn)行劃分.以新灘滑坡和三峽庫區(qū)白水河滑坡為例,利用累計(jì)位移、降雨及庫水位變化數(shù)據(jù)進(jìn)行計(jì)算驗(yàn)證.結(jié)果表明,對(duì)多元時(shí)間序列模型進(jìn)行Chow分割點(diǎn)檢驗(yàn)可對(duì)滑坡的演化階段進(jìn)行準(zhǔn)確劃分,為滑坡的臨滑預(yù)警預(yù)報(bào)提供重要判據(jù).
[Abstract]:The time-displacement curve of landslide generally has three stage characteristics: initial deformation stage, isokinetic deformation stage and accelerated deformation stage, and the acceleration of different evolution stages has different characteristics.At present, it is often based on the analysis of the characteristics of the acceleration curve to artificially divide the evolution stage, which lacks the corresponding theoretical support and quantitative calculation.In view of the above problems, a multi-factor time series prediction model is established by selecting the monthly rainfall and the variation of monthly reservoir water level elevation to the cumulative displacement of landslide.Then using the Chow partition point test theory, the maximum points of F and LR statistics in the established model are used as the segmentation points to divide the landslide evolution stage.Taking Xintan landslide and Baishuihe landslide in three Gorges Reservoir area as examples, the data of accumulative displacement, rainfall and reservoir water level change are used to calculate and verify.The results show that the multivariate time series model can be used to accurately divide the evolution stages of landslide by using Chow partition point test, which provides an important criterion for landslide prediction and early warning.
【作者單位】: 中國地質(zhì)大學(xué)數(shù)學(xué)與物理學(xué)院;
【基金】:國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)項(xiàng)目(No.2011CB710605) 國家自然科學(xué)基金重點(diǎn)項(xiàng)目(No.41230637)
【分類號(hào)】:P642.22
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