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All Journal Sumatra Journal of Disaster, Geography and Geography Education
Ahyuni, Ahyuni -
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The Difference of Landslide-Prone Areas Between Heuristic and Statistical Methods in Lima Puluh Kota Regency Ahyuni, Ahyuni -; Susetyo, Bigharta Bekti; Oktari, Fadhilla; Nur, Hamdi; Aziz, Azwirda
Sumatra Journal of Disaster, Geography and Geography Education Vol 5 No 2 (2021): Sumatra Journal of Disaster, Geography and Geography Education (December Edition)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (378.6 KB) | DOI: 10.24036/sjdgge.v5i2.392

Abstract

Measurement of landslide area can be done by heuristic, statistical or deterministic methods. This article will discuss the differences between the results of the two approaches, heuristic method and the statistical method at a scale of 1: 50,000 in Lima Puluh Kota Regency as one of the regencies in West Sumatera Province that often experiences landslides. The heuristic method is measured based on the rules outlined in the Indonesian disaster risk book (RBI) issued by the National Disaster Management Agency, while the statistical method uses the bivariate WoE (weight of Evidence) method with the variables used as determinants of landslide occurrence. The results of this study indicate that the use of heuristic methods and statistical methods shows different results in several areas regarding the high and low probability of landslide events.
Landslide Susceptibility Mapping Using Frequency Ratio-Based Fuzzy Logic Approach in Lima Puluh Kota Regency Surtani, Surtani; Ahyuni, Ahyuni -; Nur, Hamdi; Tahsya, Alifah; Prisma, Dina Rahayu Eliza
Sumatra Journal of Disaster, Geography and Geography Education Vol 8 No 2 (2024): Sumatra Journal of Disaster, Geography and Geography Education (SJDGGE)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sjdgge.v8i2.613

Abstract

One of the non-linear models for determining landslide-prone areas is the fuzzy logic method. This research aims to determine the landslide prone zoning map in Limapuluh Kota Regency, by using fuzzy gamma operations in GIS, from 11 factors: aspect, curvature, elevation, slope, landform, geology, proximity to stream, landcover, rainfall intensity, NDVI and soil. The data used is 149 landslide events in Limapuluh Kota Regency. The data was processed using the factors that cause landslides with a train and test ratio of 60: 40. The research results show that by using γ = 0.975, an area with high landslide characteristics was obtained covering an area of 28,463 ha (8.79%), with a medium area of 76,544 ha (23.64%) and low area of 218,820 (65.57%). By validating using the ROC curve and test data, an AUC value of 0.746 was obtained, which means the accuracy level of the resulting map is high.
Co-Authors Azwirda Aziz Bigharta Bekti Susetyo Hamdi Nur Oktari, Fadhilla Prisma, Dina Rahayu Eliza Surtani Surtani Tahsya, Alifah