[1]YAO Weiyi,CHANG Ming,LI Weile.Dynamic Evolution Characteristics of Material of Typical Debris Flow Using Remote Sensing Technology, in Lonngxi Catchment, Dujiangyan, China[J].Research of Soil and Water Conservation,2018,25(03):205-209.
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Dynamic Evolution Characteristics of Material of Typical Debris Flow Using Remote Sensing Technology, in Lonngxi Catchment, Dujiangyan, China
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 03
Page number:
205-209
Column:
Public date:
2018-04-10
- Title:
- Dynamic Evolution Characteristics of Material of Typical Debris Flow Using Remote Sensing Technology, in Lonngxi Catchment, Dujiangyan, China
- Keywords:
- Wenchuan Earthquake; debris flow; landslides; dynamic evolution; remote sensing monitoring
- CLC:
- P642.4;P642.5
- DOI:
- -
- Abstract:
- After ‘5·12’ Wenchuan Earthquake, the massive loose solid matters were produced in Longxi River, Dujiangyan, which provides the rich materials for debris flows. On 14th August, 2010, debris flows occurred in five valleys, which thrust in farmland and jammed the Longxi River diversions, threatened the old Longchi town.In order to research the dynamic evolution of source, we selected five debris flows as study examples and five high precision image covering the study areas, compared the evolution characters of the valleys by ArcGIS.The results indicated that:before ‘5·12’ earthquake, the study area cover was good, geologic hazards were not found, the basin stream all belonged to the clear ditch; after ‘5·12’ Earthquake,the number of landslide was 283 and the area was 41.28 hm2; after ‘8·13’ debris flow event, the number of landslide was 47 and the area was 8.29 hm2 due to rainfall, surface runoff scouer erosion, expansion and new generation of partial collapse and the landslide. After five periods of high resolution remote sensing interpretation of the landslides, the growth rates of landslides were declining year by year, the ecological environment gradually recovered.
- References:
-
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