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PEMETAAN DAERAH RAWAN LONGSOR DI WILAYAH SUB DAS TONDANO DENGAN SISTEM INFORMASI GEOGRAFIS Melisa P. Todingan; Meldi Sinolungan; Yani E.B. Kamagi; Jeanne Lengkong
COCOS Vol. 4 No. 2 (2014)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v4i2.3796

Abstract

ABSTRACTThe purpose of this study was to analyze the landslide prone areas in Sub Watershed of Tondano in order to obtain the vulnerability information and dissemination in the form of map by using the Geographic Information Systems. The study was conducted by using a Descriptive Method which consisted of a survey and map overlay, while the identification of areas prone to landslides using the scoring method. Parameters measured were soil type , slope , elevation , land use and rainfall . The results showed that the spread of landslide-prone areas in the Sub Watershed of Tondano consisted of five classes of landslide susceptibility, namely (1) No class landslide prone area of 993.12 ha, or 23.64%, spread over an area of 137.42 ha districts Eris, Kakas of 1.31 ha and 854.39 ha area of East Tondano; (2) The low vulnerability class area of 207.59 ha, or 4.94%, spread over an area of 144.10 ha district of Eris, Kakas area of 0.29 ha and 63.20 ha area of East Tondano; (3) Moderate impact class area of 894.19 ha, or 21.28% spread over an area of 503.06 ha district of Eris, Kakas area of 114.97 ha and 276.16 ha area of East Tondano; (4) High vulnerability class area of 469.23 ha, or 11.17% spread over an area of 256.27 ha district of Eris, Kakas area of 48.03 ha and 164.93 ha area of East Tondano; (5) Highest area of 1637.23 ha or 38.97% spread over area of 455.60 ha district of Eris, Kakas area of 45.46 ha and 1136.17 ha area of East Tondano.Key Words : Mapping, Landslide, Sub Watershed of Tondano, GIS (Geographic Information System)
Landslide Susceptibility Classification of the Rerer Watershed, Minahasa Regency Todingan, Melisa P.; Rahma S, Risal Nur; Umboh, Riel J.; Pakasi, Sandra E.
Jurnal Agroekoteknologi Terapan (JAT) Vol. 7 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/jat.v7i1.66531

Abstract

This study aims to analyze the level of landslide susceptibility in the Rerer Watershed, focusing on agricultural areas dominated by mixed gardens, dryland farms, and partially open land. The parameters used include slope gradient, rainfall, land use, soil type, and geology. The analysis employed a scoring method based on Geographic Information System (GIS) techniques to produce a susceptibility zonation map. The results show that the biophysical conditions of the Rerer Watershed are dominated by moderately steep slopes (15–25%), Eutropepts Dystrandepts soil types, and weathered volcanic rocks (Qtv), combined with an annual rainfall of approximately 1,500–2,000 mm. Anthropogenic factors, particularly agricultural cultivation on sloping terrain, significantly contribute to increased vulnerability. The landslide susceptibility zonation is classified into three levels: low (43.37 ha or 14.75%), moderate (230.17 ha or 78.27%), and high (20.53 ha or 6.98%). These findings emphasize the importance of implementing soil and water conservation strategies—such as terracing, cover crops, and agroforestry systems—to mitigate landslide risks while maintaining the hydrological sustainability of the Rerer Watershed in Minahasa Regency. Keywords: landslide susceptibility, agricultural land, watershed . Abstrak. Penelitian ini bertujuan menganalisis tingkat kerawanan longsor di DAS Rerer dengan fokus pada kawasan lahan pertanian yang didominasi kebun campuran, tegalan/ladang, dan sebagian lahan terbuka. Parameter yang digunakan meliputi kemiringan lereng, curah hujan, penggunaan lahan, jenis tanah, dan geologi. Analisis dilakukan dengan metode skoring berbasis Sistem Informasi Geografis (SIG) untuk menghasilkan zonasi kerawanan. Hasil penelitian menunjukkan bahwa kondisi biofisik DAS Rerer didominasi lereng agak curam (15–25%), jenis tanah Eutropepts Dystrandepts, serta batuan vulkanik (Qtv) yang mudah lapuk, dikombinasikan dengan curah hujan tahunan sekitar 1500-2000 mm/tahun. Faktor antropogenik berupa aktivitas budidaya lahan pertanian pada lereng miring menjadi pendorong utama peningkatan kerentanan. Zonasi kerawanan longsor terbagi dalam tiga kelas, yaitu rawan rendah seluas 43,37 Ha atau sekitar 14,75%, rawan sedang seluas 230,17 Ha atau sekitar 78,27%, dan rawan tinggi seluas 20,53 atau sekitar 6,98%. Temuan ini menegaskan pentingnya penerapan strategi konservasi tanah dan air, seperti terasering, vegetasi penutup, dan sistem agroforestri, guna mitigasi risiko longsor sekaligus menjaga keberlanjutan fungsi hidrologis DAS Rerer di Kabupaten Minahasa. Kata Kunci: rawan longsor, lahan pertanian, daerah aliran sungai