ASY’ARI, ZIDAN (2023) GEOLOGI, ANALISIS KESTABILAN LERENG DAN ZONASI RAWAN LONGSOR KALURAHAN TEGALREJO DAN SEKITARNYA, KAPANEWON GEDANGSARI, KABUPATEN GUNUNGKIDUL, DAERAH ISTIMEWA YOGYAKARTA. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
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GEOLOGI, ANALISIS KESTABILAN LERENG DAN ZONASI RAWAN
LONGSOR KALURAHAN TEGALREJO DAN SEKITARNYA,
KAPANEWON GEDANGSARI, KABUPATEN GUNUNGKIDUL,
DAERAH ISTIMEWA YOGYAKARTA
SARI
Daerah penelitian berada di Kalurahan Tegalrejo dan sekitarnya, Kapanewon
Gedangsari, Kabupaten Gunungkidul, Daerah Istimewa Yogyakarta. Secara geografis
daerah penelitian berada pada koordinat 110°36’47.40” BT - 110°39’30.81” BT,
7°50’42.42” LS - 7°47’59.74” LS dan masuk kedalam zona 49 S UTM dengan
koordinat 457355 mT – 462355 mT, 9132805 mS – 9137805 mS. Kegiatan penelitian
dilakukan untuk mengetahui kondisi geologi yang meliputi aspek geomorfologi,
stratigrafi dan struktur geologi yang berkembang di daerah penelitian. Selain itu, untuk
mengetahui nilai kestabilan lereng yang kemudian dijadikan dasar penentuan zonasi
daerah rawan longsor dengan bantuan beberapa parameter pendukung. Metodologi
penelitian yang dilakukan meliputi pengambilan data langsung di lapangan, baik
berupa data geologi maupun geologi teknik. Selanjutnya melakukan analisis
laboratorium berupa uji paleontologi, petrografi dan uji sifat fisik dan mekanik tanah,
dimana hasil pengujian akan digunakan dalam penentuan kondisi geologi, analisis
kestabilan lereng dan penentuan zonasi daerah rawan longsor. Pada daerah penelitian
berkembang pola pengaliran subdendritik, paralel dan subparalel. Secara
geomorfologi, daerah penelitian terbagi menjadi satuan bentuklahan tubuh sungai,
dataran aluvial, perbukitan struktural, lereng struktural, gawir sesar dan lembah
struktural. Secara stratigrafi, daerah penelitian dari tua ke muda tersusun oleh satuan
batupasir Kebo-Butak, satuan batupasir-tufan Semilir, satuan tuf Semilir, satuan
breksi-andesit Nglanggeran dan endapan aluvial. Hasil analisis kestabilan lereng
menunjukkan bahwa pada lereng 1, 2 dan 3 masuk kedalam kelas labil (nilai FK <
1,07), lereng 4 masuk kedalam kelas stabil (nilai FK > 1,25) dan lereng 5 dan 6 masuk
kedalam kelas kritis (nilai FK 1,07-1,25). Zonasi daerah rawan longsor dibuat
berdasarkan parameter berupa data curah hujan, jarak terhadap sesar, jenis batuan,
kegempaan, kemiringan lereng, tata air lereng, penggunaan lereng dan hasil analisis
kestabilan lereng. Diketahi bahwa daerah penelitian terbagi menjadi 3 klasifikasi
longsor, yaitu kelas rendah, sedang dan tinggi, dimana yang mendominasi pada daerah
penelitian adalah kelas sedang.
Kata kunci: geologi, kestabilan lereng, zonasi rawan longsor
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GEOLOGY, SLOPE STABILITY ANALYSIS AND LANDSLIDE-PRONE ZONE
IN TEGALREJO VILLAGE AND ITS SURROUNDINGS,
GEDANGSARI DISTRICT, GUNUNGKIDUL REGENCY,
SPECIAL REGION OF YOGYAKARTA
ABSTRACT
The area used in this research is Tegalrejo Village and its surroundings,
Gedangsari District, Gunungkidul Regency, Special Region of Yogyakarta.
Geographically the study area is at the coordinates of 110°36'47.40” E -
110°39'30.81” E, 7°50'42.42” S - 7°47'59.74” S and enters the 49 S UTM zone with
coordinates 457355 mE – 462355 mE, 9132805 mS – 9137805 mS. The research was
conducted to determine the geological conditions including aspects of geomorphology,
stratigraphy and geological structures that develop in the research area. In addition,
this research was also carried out to determine the value of slope stability which was
then used as the basis for determining the zoning of landslide-prone areas with the
help of several supporting parameters. The research methodology involved collecting
data directly from the field, both in the form of geological data and engineering
geology. Laboratory analysis was then carried out in the form of paleontological tests,
petrography and tests of physical and mechanical properties of the soil, where the test
results were used in determining geological conditions, analysing slope stability and
determining the zoning of landslide-prone areas. The research area has subdendritic,
parallel and subparaell drainage patterns. Geomorphologically, the study area is
divided into river body landforms, alluvial plains, structural hills, structural slopes,
fault scarps and structural valleys. While stratigraphically, the research area from
oldest to youngest is composed of Kebo-Butak sandstone units, Semilir tuff-sandstone
units, Semilir tuff units, Nglanggeran andesite-breccia units and alluvial deposits. The
results of the slope stability analysis show that slopes 1, 2 and 3 are in the unstable
class (FK value <1.07), slope 4 is in the stable class (FK value > 1.25) and slopes 5
and 6 are in the critical class (FK value 1,07 - 1.25). Landslide-prone areas are zoned
based on parameters such as rainfall data, distance to the fault, lithology type,
seismicity, slope, slope water system, land use and slope stability analysis results. It is
concluded that the research area can be divided into three classifications of landslides,
namely low, moderate and high classes, where the dominant area of research is the
moderate class.
Keywords: geology, landslide-prone zoning, slope stability
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | geology, landslide-prone zoning, slope stability |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 18 Aug 2023 02:10 |
| Last Modified: | 05 Jan 2024 06:17 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/36943 |
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