The Study of Landslide Occurrence Hydrological Condition by Using Seismic Records and Rainfall Observation
Abstract
In the study, continuous seismic records were used to identify landslide-triggered seismic signals, and to extract the initial moments of landslides. We obtained the exact occurrence time of 84 rainfall-triggered large landslides with disturbed area of larger than 0.1 km2, and applied the time information to hydrological analysis. Subsequently, the amount and duration of precipitation were calculated to define the rainfall thresholds for large landslides. In traditional rainfall analysis, the effect of infiltration and change of pore water pressure are usually neglected. This study applied the soil water index (SWI) including three tanks of infiltrated water to model soil water content which are influenced by present and antecedent rainfall. The results reveal that the SWIs of the second tank and the third tank could be the representative indicators for the initiation of large landslides. In addition to large landslides, we also constructed the rainfall thresholds for 238 small landslides and attempt to distinguish the difference of critical rainfall and hydrological condition between two different scales of landslides.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMNH14A..07K
- Keywords:
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- 1810 Debris flow and landslides;
- HYDROLOGYDE: 4302 Geological;
- NATURAL HAZARDSDE: 4303 Hydrological;
- NATURAL HAZARDSDE: 4315 Monitoring;
- forecasting;
- prediction;
- NATURAL HAZARDS