LUO Yuting,TANG Chuan,CHEN Ming,et al.Temporal and Spatial Evolution Characteristics of Landslides in Debris Flow Basin in Meizoseismal Area[J].Research of Soil and Water Conservation,2020,27(03):336-341.
强震区泥石流流域崩滑体物源时空演变特征
- Title:
- Temporal and Spatial Evolution Characteristics of Landslides in Debris Flow Basin in Meizoseismal Area
- 文章编号:
- 1005-3409(2020)03-0336-06
- Keywords:
- meizoseismal area; debris flow; landslide; spatiotemporal evolution
- 分类号:
- P642.23
- 文献标志码:
- A
- 摘要:
- 为探究强震区泥石流崩滑体物源的演化特征,选择汶川强震区典型泥石流流域的多期遥感影像进行崩滑体物源解译,建立了研究区震后崩滑体物源的长时间序列数据集,并分析了其演变与高程、坡度、坡向、距沟道距离等关键控制因子的关系。通过多期解译结果的对比分析,得出泥石流流域崩滑体物源的时空演变特征。结果显示:2008—2017年五期影像解译的物源面积分别为15.32 km2,9.04 km2,7.66 km2,4.40 km2,3.63 km2,占研究区面积的比例分别为38.25%,22.58%,19.13%,10.99%,9.06%; 物源数量分别为1 797处,1 510处,1 245处,617处,602处,且研究区的物源面积在震后近十年内以对数函数模式演化。2008—2017年研究区崩滑体物源集中发育的高程区间逐渐由1 400～1 600 m转变为1 800～2 000 m,有向高海拔方向发展的演化趋势; 多期崩滑体物源发育的优势坡度区间均为40°～45°,优势坡向为S,SE; 崩滑体物源的发育与距沟道距离表现为负相关,区域内暴发大规模泥石流事件后,距沟道距离对物源发育的控制作用也会发生较大波动。研究成果对于丰富震区泥石流物源演化理论具有积极意义。
- Abstract:
- In order to explore the evolution characteristics of debris flow source in meizoseismal area, the multiphase remote sensing images of typical debris flow basin in Wenchuan meizoseismal area were used to interpret the landslide, establish a long time series data set of landslide in the research area, and analyze the relationship between evolution and elevation, slope, slope direction and distance from channel. Through the comparative analysis of the results of multi-phase interpretation, the spatiotemporal evolution characteristics of landslide bodies in the debris flow basin were obtained. The results show that the source areas of the five stage images from 2008 to 2017 are 15.32 km2, 9.04 km2, 7.66 km2, 4.40 km2, 3.63 km2, respectively, accounting for 38.25%, 22.58%, 19.13%, 10.99% and 9.06% of the research area, respectively, and the numbers of landslides are 1 797, 1 510, 1 245, 617 and 602, respectively. In addition, the evolutions of landslides in the study area follow the logarithmic function model; from 2008 to 2017, the height range of the concentrated development of material source of landslide bodies in the study area gradually changed from 1 400～1 600 m to 1 800～2 000 m, showing an evolutionary trend towards high altitude; and advantageous slope ranges of multiphase landslide development are 40°～45 °, edge slope aspects face towards the S, SE; the development of landslides is negatively correlated with the distance from the channel, and the control of provenance development by the distance from the channel also fluctuates greatly after the occurrence of large-scale debris flow events in the region. The research results have positive significance for enriching the theory of debris flow source evolution in earthquake area.
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备注/Memo
收稿日期:2019-07-09 修回日期:2019-07-18资助项目:国家重点研发计划项目(2017YFC1501004); 国家自然科学基金(41672299)第一作者:罗玉婷(1995—),女,贵州赤水人,硕士研究生,主要从事工程地质与地质灾害防治方面研究。E-mail:692732248@qq.com通信作者:唐川(1961—),男,安徽合肥人,博士,教授,主要从事地质灾害、环境地质等方面研究。E-mail:tangc@cdut.edu.cn.