STUDI POTENSI LONGSOR BERDASARKAN GEOMETRI DARI DATA GROUND PENETRATING RADAR (GPR) DAN SISTEM INFORMASI GEOGRAFIS DI DAERAH KARANGTENGAH, IMOGIRI, BANTUL, D.I. YOGYAKARTA

PANGGABEAN, CATHERINE MONALISA (2022) STUDI POTENSI LONGSOR BERDASARKAN GEOMETRI DARI DATA GROUND PENETRATING RADAR (GPR) DAN SISTEM INFORMASI GEOGRAFIS DI DAERAH KARANGTENGAH, IMOGIRI, BANTUL, D.I. YOGYAKARTA. Other thesis, UPN 'Veteran" Yogyakarta.

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Abstract

STUDI POTENSI LONGSOR BERDASARKAN GEOMETRI DARI DATA
GROUND PENETRATING RADAR (GPR) DAN SISTEM INFORMASI
GEOGRAFIS DI DAERAH KARANGTENGAH, IMOGIRI, BANTUL, D.I.
YOGYAKARTA
Catherine Monalisa Panggabean1)
1)Teknik Geofisika UPN “Veteran” Yogyakarta
ABSTRAK
Tanah longsor merupakan salah satu bentuk hasil gerakan massa (mass movement) di sepanjang
bidang gelincirnya. Bencana tanah longsor ini sering terjadi di wilayah Imogiri, Bantul karena lebih
dari 50% wilayah Kabupaten Bantul merupakan wilayah yang rawan terhadap gerakan tanah. Studi
GPR dilakukan untuk menganalisis lapisan lapuk dan geometri bidang gelincir serta studi berbasis
Sistem Informasi Geografis juga dilakukan untuk melihat persebaran zona potensi longsor pada
daerah penelitian.
Studi potensi longsor berdasarkan interpretasi data Ground Penetrating Radar (GPR) dan peta
berbasis Sistem Informasi Geografis (SIG). Penelitian dengan GPR terdiri dari 9 lintasan yang
berorientasi relatif timurlaut-baratdaya dan 4 lintasan yang berorientasi timur-barat. Pada pembuatan
Peta Kerentanan Longsor berbasis SIG, digunakan 5 parameter, yaitu curah hujan, kemiringan lereng,
ketebalan tanah, tataguna lahan, dan jenis batuan.
Pada penampang radargram GPR diidentifikasikan terdapat 3 lapisan, yaitu soil (±0-1 m),
lapisan campuran soil dan breksi (±1-2,5 m), serta bedrock dengan litologi breksi gunungapi (±2,5-6
m). Batas campuran soil dan breksi dan bedrock dianggap sebagai bidang gelincir longsor dengan
arah kemiringan kearah barat dan bentuk bidang gelincir yang relatif rata. Tipe longsoran yang
mungkin terjadi, yaitu tipe longsoran campuran antara debris flow dan translational landslide.
Berdasarkan Peta Kerawanan Longsor berbasis SIG, diperoleh 3 kelas kerawanan bencana longsor,
yaitu kerawanan rendah (3,34 – 3,52), sedang (3,52 – 3,7), dan tinggi (3,7 – 3,9). Daerah dengan
tingkat kerawanan sedang sampai tinggi perlu diwaspadai dan diharapkan adanya tindakan mitigasi,
terutama pada bulan-bulan basah, yaitu bulan Oktober hingga April untuk mengurangi risiko atau
dampak akibat peristiwa tanah longsor.
Kata Kunci: Bidang Gelincir, GPR, Potensi Tanah Lonsor, SIG
THE STUDY OF LANDSLIDE POTENTIAL BASED ON THE GEOMETRY OF
GROUND PENETRATING RADAR (GPR) DATA AND GEOGRAPHIC
INFORMATION SYSTEM (GIS) IN KARANGTENGAH, IMOGIRI, BANTUL,
D.I.YOGYAKARTA
Catherine Monalisa Panggabean1)
1)Geophysical Engineering UPN “Veteran” Yogyakarta
ABSTRACT
Landslides are one of the mass movements forms that moves along the slip plane. Landslides
often occurred in the Imogiri area, Bantul, because more than 50% of the Bantul Regency area is a
landslide prone area. GPR studies were conducted to obtain information about weathered layer and
slip plane’s geometry and GIS studies were also carried out to see the distribution of landslide prone
area.
Landslide potential studies was conducted based on the interpretation of Ground Penetrating
Radar (GPR) data and Geographic Information System (GIS)-based maps. The study with GPR
consisted of 9 lines with northeast-southwest orientation and 4 lines with east-west orientation. In
order to obtain Landslide Hazard Map, 5 parameters were used, which are precipitation data, slope
data, soil thickness data, land use data, and lithology data.
Based on GPR radargram, it was identified that there were 3 layers, which are soil (±0-1 m),
a layer of soil and volcanic breccia mixtures (±1-2.5 m), and a bedrock with volcanic brection
lithology (±2.5-6 m). The boundary of the mixture of soil and volcanic breccia and bedrock is
considered to be the landslide slip plane with slope direction towards the west with a relatively flat
slip plane. The type of lindslides that may occur is a mixed type between debris flow and translational
landslide. Based on the GIS-based Landslide Hazard Map, 3 classes of landslide disaster
vulnerability were obtained, namely low vulnerability (3.34 – 3.52), moderate vulnerability (3.52 –
3.7), and high vulnerability (3.7 – 3.9). Areas with moderate to high levels of vulnerability need to be
watched out for and landslide mitigation measures are to be expected, especially in the wet season,
(October to April) to reduce the risk or impact of landslide hazard.
Keywords : GIS, GPR, Landslide Potential, Slip Plane

Item Type:	Thesis (Other)
Uncontrolled Keywords:	GIS, GPR, Landslide Potential, Slip Plane
Subjects:	Q Science > QE Geology
Depositing User:	Eko Yuli
Date Deposited:	14 Sep 2022 02:34
Last Modified:	14 Sep 2022 02:34
URI:	http://eprints.upnyk.ac.id/id/eprint/30891

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