HAMZAH, MUH. ALIF (2023) GEOLOGI DAN ANALISIS KESTABILAN LERENG UNTUK MENGETAHUI ZONA RAWAN LONGSOR DESA SUKOWUWUH DAN SEKITARNYA, KECAMATAN BENER, KABUPATEN PURWOREJO, PROVINSI JAWA TENGAH. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
vi
ABSTRAK
Lokasi penelitian secara administratif berada di Desa Sukowuwuh dan
sekitarnya, Kecamatan Bener, Kabupaten Purworejo, Provinsi Jawa Te ngah. Secara
geografis lokasi penelitian berada pada koordinat (UTM-WGS 84 zona 49 S)
393400 m T – 398400 m T dan 9158900 m S – 9163900 m S. Peta Prakiraan
Wilayah Potensi Terjadinya Gerakan Tanah tahun 2016 oleh Pusat Vulkanologi dan
Mitigasi Bencana Geologi (PVMBG), terungkap bahwa Kabupaten Purworejo,
Provinsi Jawa Tengah, termasuk dalam kategori wilayah dengan potensi gerakan
tanah menengah hingga tinggi. Dilakukan identifikasi zonasi kerawanan tanah
longsor di wilayah ini dengan tujuan untuk mengurangi risiko dan dampaknya
melalui tindakan mitigasi yang sesuai dengan kondisi lapangan.
Penelitian ini dilakukan dengan menggunakan metode deskriptif analisis
untuk mendeskripsikan atau memberikan gambaran terhadap objek yang akan
diteliti melalui data yang telah diperoleh. Kondisi geologi meliputi geomorfologi,
stratigrafi dan struktur geologi daerah penelitian. Pola pengaliran daerah penelitian
termasuk ke dalam jenis subdendritik dengan 3 bentuklahan meliputi tubuh sungai,
perbukitan struktural, dan lereng struktural. Stratigrafi daerah penelitian di bagi
menjadi dua satuan litostratigrafi tidak resmi yaitu dari tua ke muda yaitu satuan
breksi Kaligesing (Oligosen Akhir - Miosen Awal) dan satuan batugamping Sentolo
(Miosen Tengah - Miosen Akhir). Struktur geologi berupa kekar gerus, sesar
mendatar kanan, dan sesar normal.
Berdasarkan hasil analisis dan pengolahan data geologi teknik, didapatkan
overlay parameter kelerengan, jenis batuan, jenis lahan, curah hujan, dan jarak dari
kelurusan berupa zonasi kerawanan bencana longsor yang di dominasi oleh tingkat
potensi longsor sedang dengan luas 1.590,2 Ha yang menyusun 63,6% total daerah
penelitian. Selatan - Timur daerah penelitian menjadi area yang diisi oleh potensi
longsor tinggi dengan luas 312 Ha yang menyusun 12,5% total daerah penelitian
dan Utara – Barat diisi oleh potensi longsor rendah dengan luas 597,8 Ha yang
menyusun 23,92% total daerah penelitian. Hasil analisis sifat tanah keenam lereng
menunjukkan nilai faktor keamanan pada tingkat aman kecuali lereng 5. Korelasi
kurva rasio berat isi tanah, kohesi, dan sudut geser dengan faktor keamanan lereng
menunjukkan perbandingan yang lurus untuk sudut geser dalam serta kohesi,
sedangkan perbandingan terbalik untuk berat isi tanah.
Kata kunci : geologi, kestabilan lereng, sifat tanah, zonasi
vii
ABSTRACT
The administrative research location is in Sukowuwuh Village and its
surroundings, Bener District, Purworejo Regency, Central Java Province.
Geographically, the research location is at coordinates (UTM-WGS 84 zone 49 S)
393400 m E – 398400 m E and 9158900 m S – 9163900 m S. Forecast Map of Areas
of Potential Ground Movement Occurrence in 2016 by the Center for Volcanology
and Geological Hazard Mitigation (PVMBG), it was revealed that Purworejo
Regency, Central Java Province, is included in the category of areas with medium
to high potential for ground movement. Landslide susceptibility zoning was
identified in this area with the aim of reducing the risk and impact through
mitigation measures that are appropriate to field conditions.
This research was carried out using descriptive analysis methods to describe
or provide an overview of the objects to be studied through the data that has been
obtained. Geological conditions include geomorphology, stratigraphy and
geological structure of the research area. The drainage pattern of the research area
is included in the subdendritic type with 3 land forms including river bodies,
structural hills, and structural slopes. The stratigraphy of the research area is
divided into two unofficial lithostratigraphic units, namely from old to young,
namely the Kaligesing breccia unit (Late Oligocene - Early Miocene) and the
Sentolo limestone unit (Middle Miocene - Late Miocene). The geological structure
consists of scour joints, right-slip faults and normal faults.
Based on the results of the analysis and processing of technical geological
data, an overlay of slope parameters, rock type, land type, rainfall and distance
from the alignment was obtained in the form of landslide hazard zoning which is
dominated by a moderate level of landslide potential with an area of 1,590.2 Ha
which makes up 63, 6% of the total study area. South - East of the research area is
an area filled with high landslide potential with an area of 312 Ha which makes up
12.5% of the total research area and North - West is filled with low landslide
potential with an area of 597.8 Ha which makes up 23.92% of the total research
area. The results of the analysis of the soil properties of the six slopes show that the
value of the safety factor is at a safe level except for slope 5. The correlation curve
of the ratio of soil bulk density, cohesion and shear angle with the slope safety
factor shows a straight comparison for the internal shear angle and cohesion, while
the inverse ratio for the bulk density land.
Keywords : geology, slope stability, soil properties, zoning
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | geology, slope stability, soil properties, zoning |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Geography |
| Depositing User: | Eko Yuli |
| Date Deposited: | 01 Nov 2023 02:35 |
| Last Modified: | 01 Nov 2023 02:35 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/38102 |
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