Effect of Precipitation Characteristics on Spatial and Temporal Variations of Landslide in Kermanshah Province in Iran

Effect of Precipitation Characteristics on Spatial and Temporal Variations of Landslide in Kermanshah Province in Iran


DOI: https://doi.org/10.30564/jgr.v2i4.1818

Abstract


Landslide can be defined as the mass movement of sloping slopes underthe influence of mass gravity and its stimuli such as earthquakes, floodsand flood plains. This phenomenon is one of the natural hazards thatevery year causes a lot of financial and financial losses in mountainous,rain-fed and seismic areas. Detection of time and the magnitude of landslides are necessary to understand the causes of landslide and to warnpotential hazards. In this research, the amount of landslide displacementin Kermanshah province was evaluated by the characteristics of rainfall.To this end, a network of fixed points in and out of the slipping mass of20 points was created to monitor the amount of displacement on differentslip load users and the amount of displacement of each point in 5 timeintervals using the Global Positioning System for two-dimensional GPSmeasurement. The results of the 511-day follow-up showed that the totalhorizontal displacement of the moving points in the 5 intervals measuredat 1658 mm has a monthly displacement rate of 112 mm. Also, the totalvertical displacement of moving points at the same time is 899 mm, witha monthly movement rate of 71 mm. Then, precipitation variances such asrainfall, rainfall, precipitation duration, maximum rainfall intensity in theintervals of 10, 20, 30 and 60 minutes and the average rainfall intensitywere calculated and extracted for each of the 5 time periods. The drawingof the vectors of points on the topographic map of the area indicated thatthe direction of mass movement is in the direction of elevation gradientof the region. The results showed that only the precipitation severity withthe landslide had a good correlation. The landslide movement had thehighest correlation with average rainfall intensity (R = 0.85) and withmaximum 30 minutes rainfall (R = 0.67), respectively, and other rainfallcharacteristics like amount, duration, and type of rainfall had not significantly correlated with movement of landslides.

Keywords


Characteristics of precipitation; Effects; Landslide; Movement; GPS

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