Abstract
Abstract. Southwest Monsoon (Habagat) and Typhoon Luis caused a deep-seated landslide that struck Sitio Kayang, Brgy. Immuli, Pidigan, Abra on August 15, 2018. Rainfall-induced deep-seated landslides displace partially at a time which necessitates the determination of remaining landslide volume along the slope. In this study, the potential landslide volume and mass transport were estimated using several remote sensing products, including SAR (Synthetic Aperture Radar) data and LiDAR-DTM (Light Detection and Ranging-Digital Terrain Model). The post-landslide DTM was generated using Sentinel-1 SAR data. The potential landslide volume and landslide failure surfaces were ascertained through the stability analysis using Scoops3D, while the mass transport volume was obtained from the pre- and post-landslide DTM. Results showed that the estimated total volume in all the landslide areas was 135,962 m3. Meanwhile, the remaining landslide volume (i.e., difference between potential volume from pre-landslide event and volume of transported mass) yielded illogical values due to the derived large mass transport values. This blunder may be attributed to the generalization of the transported volume (due to Sentinel-1 DTM coarse resolution), and decorrelation due to vegetation cover. Overall, the LiDAR-DTM data delivered a high-resolution estimation of the potential landslide volume and proved to be useful for landslide application studies. Future studies may incorporate field data (e.g., geotechnical parameters, groundwater, landslide actual measurements) for more accurate performance of stability analysis and may best to utilize LiDAR-DTM in post-landslide volume computation for a more reliable estimation of mass transport and potentially remaining landslide volume.
Highlights
1.1 BackgroundLandslides can cause destruction and damage to properties that may even lead to human fatalities
According to DOST-PHIVOLCS (2018), a deep-seated landslide hazard was present in the area and was assessed by DENR Mines and Geoscience Bureau (MGB) via HazardHunterPH as having moderate landslide susceptibility with a possible landslide occurrence
This study aims to determine the potential volume of the 2018 landslide event in Sitio Kayang, Immuli, Pidigan, Abra and to obtain the remaining landslide volume in the study area using Light Detection and Ranging (LiDAR) and RADARderived digital terrain model (DTM)
Summary
Landslides can cause destruction and damage to properties that may even lead to human fatalities. Landslide is the movement of mass of rock, soil and debris down the slope under the influence of gravity (Cruden, 1991). This hazard may be induced by rainfall, earthquakes, volcanic eruption, by other natural phenomena or even man-made activities (Wieczorek, 1996). On August 15, 2018, the combined effects of Southwest monsoon (Habagat) and Typhoon Luis caused a landslide that struck Sitio Kayang, Brgy. According to DOST-PHIVOLCS (2018), a deep-seated landslide hazard was present in the area and was assessed by DENR Mines and Geoscience Bureau (MGB) via HazardHunterPH (https://hazardhunter.georisk.gov.ph/) as having moderate landslide susceptibility with a possible landslide occurrence
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