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All Journal Indonesian Journal of Geography JOURNAL ONLINE OF PHYSICS Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) Prosiding University Research Colloquium
Koesuma, Sorja
Department of Physics, Sebelas Maret University
Humanities Astronomy Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Physics

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Groundwater Vulnerability Comparison Using DRASTIC and GOD Methods in Surakarta City Koesuma, Sorja; Ramelan, Ari Handono; Sutarno, Doddy
Indonesian Journal of Geography Vol 56, No 1 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.87232

Abstract

Demographic growth, urbanization, economic development, agriculture, and consumption per capita have increased the demand for water resources. The population density of Surakarta affects the city’s ability to fulfil its residents’ clean water requirements. As an urban region, Surakarta may be impacted by development activities that degrade the quality and quantity of groundwater. This growing demand should be balanced against effective management of water source regions. This research aims to investigate groundwater vulnerability in Surakarta City. We employed the DRASTIC and GOD methods and compared both results. These methods used the overlay and indexing approaches using GIS based on field data and secondary data such as drill, rainfall, and topographic data. The results of DRASTIC show three types of vulnerability: high (0.21%; 9.87 ha), moderate (94.22%; 4,355.98 ha), and low (5.56%; 257.25 ha), while GOD method results in high (7.03%; 324.96 ha), moderate (52.90%; 2,445.84 ha), low (38.69%; 1,788.81 ha), and negligible (1.37%; 63.49 ha). Based on both methods, we identified Banjarsari district as a location with high groundwater vulnerability. The correlation coefficient between the two methods is 0.511. This value shows that the correlation criteria are acceptable and comparable. This research can be used by local authorities and policymakers to manage groundwater resources. 
BAHAYA GEMPA BUMI BERDASARKAN KONDISI GEOLOGI LOKAL DALAM UPAYA MITIGASI BENCANA DI KAPANEWON PLERET, KABUPATEN BANTUL Triyono, Agus; Paripurno, Eko Teguh; Nugroho, Arif Rianto; Koesuma, Sorja; Maharani, Yohana Noradika
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 3 (2025): JOP (Journal Online of Physics) Vol 10 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i3.44703

Abstract

Kapanewon Pleret merupakan salah satu wilayah dengan tingkat kerusakan tertinggi saat gempa bumi Bantul 27 Mei 2006. Namun hingga saat ini, belum terdapat kajian yang secara khusus memetakan karakteristik geologi lokal dan kerentanan seismik di wilayah ini. Penelitian ini bertujuan untuk mengevaluasi potensi bahaya gempa bumi di Kapanewon Pleret, Kabupaten Bantul, berdasarkan karakteristik geologi lokal yang diperoleh melalui metode Horizontal to Vertical Spectral Ratio (HVSR). Data mikrotremor dari 70 titik diolah untuk memperoleh parameter frekuensi dominan (fₒ), faktor amplifikasi (Aₒ), indeks kerentanan seismik (Kg), percepatan tanah maksimum (PGA), dan Ground Shear Strain (GSS). Hasil penelitian menunjukkan bahwa nilai fₒ berkisar antara 0,62–12,17 Hz, Aₒ antara 0,89–6,41, dan Kg dalam rentang 0,18–26,02. Nilai PGA berada pada kisaran 0,08 hingga >0,79 g, sementara GSS tercatat antara 1,06 × 10⁻⁴ hingga 1,42 × 10⁻². Zona dengan nilai fₒ rendah, Aₒ tinggi, serta Kg dan GSS tinggi banyak ditemukan pada wilayah yang tersusun atas endapan Merapi muda, yang menunjukkan tingkat kerentanan seismik yang signifikan. Temuan ini menegaskan pentingnya karakterisasi geologi lokal sebagai dasar perencanaan mitigasi bencana gempa bumi.
IMPACT OF SOLAR RADIATION MODIFICATION ON TEMPERATURE CHANGES FROM SINABUNG ERUPTION IN KARO REGENCY Koesuma, Sorja; Sakhina, Friska Ayu; Gernowo, Rahmat
JOURNAL ONLINE OF PHYSICS Vol. 11 No. 1 (2025): JOP (Journal Online of Physics) Vol 11 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v11i1.47783

Abstract

This study combines reanalysis of observational data and climate modelling to examine temperature changes due to the eruption of Mount Sinabung and future temperature projections. Observation data were taken from ERA5 to identify local temperature changes following the Sinabung eruption in February 2018, while simulations from the Geoengineering Model Intercomparison Project (GeoMIP) were used to observe temperature responses under the Solar Radiation Modification (SRM) scenario. Temperature projections were conducted for the period 2026 – 2099 using the CESM-WACCM, CNRM-ESM2-1, and MPI-ESM1-2-LR models under the G6Solar, G6Sulfur, SSP2-4.5, and SSP5-8.5 scenarios. The results show that GeoMIP temperatures are lower than ERA5 after bias correction. SRM was found to effectively decrease temperature at the summit of Sinabung and Karo Regency, approaching low emission scenarios (SSP2-4.5), with increases of 1,90℃ and 1,05℃ under G6Solar, and 1,02℃ and 0,96℃ under G6Sulfur. Conversely, in the high emission scenarios (SSP5-8.5), temperatures increased to 2,13℃ and 2,1℃.
Pembuatan Tempat Cuci Tangan Sistem Injak Sebagai Upaya Pencegahan Covid-19 Di Desa Kalikajar Koesuma, Sorja; Nabila, Dhia Azmi; Abdullah, Azar Rafliardi; Krismonanto, Wisnu; Arifin, Imam; Nursodik, Fajar; Pratiwi, Rizki Amalia; Susanto, Andika Dwi Cipta; Ananta, Aria Arga; Salfas, Muhammad
Prosiding University Research Colloquium Proceeding of The 13th University Research Colloquium 2021: Mahasiswa (Student Paper)
Publisher : Konsorsium Lembaga Penelitian dan Pengabdian kepada Masyarakat Perguruan Tinggi Muhammadiyah 'Aisyiyah (PTMA) Koordinator Wilayah Jawa Tengah - DIY

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Abstract

The Covid-19 pandemic has caught the world's attention which hascaused various impacts on life. The spread of the virus takes placerapidly through droplets or physical contact to encouragegovernments to implement policies such as washing hands activitiesusing soap cleanly and correctly. Kalikajar village government asone of the villages that are exposed Covid-19 in Purbalingga alsohave appealed to the people to always washing hands with soap.However, the availability of hand washing facilities is still limitedand the conditions are alarming due to the lack of communitymaintenance. Therefore, as a form of community service, KuliahKerja Nyata (KKN) of Sebelas Maret University has initiative tocreate washbasin based on stepping system that can be used bypeople to get clean and healthy living. The service implementationstages include survey and identification of partner problems,preparation of problem solving frameworks, problem solving solutionprograms, implementation of service programs, monitoring andevaluation. Manufacture of washbasin through the manufacturingprocess and framework design, painting, assembly, and testing. Thewashbasin is distributed in several locations in Kalikajar Village,such as the Kalikajar Village Hall Office, Baitul Ghufron Mosque,and Baitul Muslimin Mosque. The distribution activites to severallocations had help from local residents, takmir mosques, and villageheads Kalikajar. Through this washbasin, the UNS KKN Team hopesthat the community and village government officials can develop andremind each other of the habit of washing hands so that it indirectlyhelps the government in preventing Covid-19 transmission in thesurrounding community.
Identifikasi Struktur Sesar Gunung Muria Menggunakan Data Satelit Gravitasi Koesuma, Sorja; Sibarani, Ferdinan Hotman; Legowo, Budi
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2021: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2021
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/prosidingsnfa.v5i0.71829

Abstract

Abstract: The north coast of Jepara is a region where the development of Muria nuclear power plant takes place which is chosen by the central government through National Nuclear Energy Agency of Indonesia. This nuclear power plant is located in Muria peninsula which will be affected because of tectonics and volcanic activities in such area, mainly in Muria mountain. This study uses gravimetric method to determine the subsurface structure in Muria mountain area. The gravity data is obtained from https://topex.ucsd.edu/cgi-bin/get_data.cgi is dispersed in Muria mountain. The value of anomaly which is obtained is reduced with several corrections and the value of Complete Bouguer Anomaly is achieved. The separation of regional and residual anomaly uses Second Vertical Derivative. The modeling of subsurface used forward modelling method. From this modelling, the rock density widening is in the value of 2.4 g/cm3 for basalt lava or andesite, 2.43 g/cm3 for lava tuff and sand tuff, 2.5 g/cm3 for sandstone tuff and conglomerate tuff with clay stone inserted, and 2.7 g/cm3 for sand limestone and clay limestone. The result of this modelling is shown that there is fault around Muria mountain and is identified as Tempur and Rahwatu fault.Abstrak: Pesisir utara Jepara dijadikan sebagai lokasi pengembangan PLTN Muria yang dipilih oleh pemerintah pusat melalui Badan Nuklir Nasional (Batan). Lokasi PLTN yang berada di Semenanjung Muria akan terkena dampak karena adanya aktivitas tektonik dan vulkanik di daerah tersebut, terutama di Gunung Muria. Penelitian ini menggunakan metode gravitasi untuk mengetahui struktur bawah permukaan di sekitar Gunung Muria. Data gravitasi yang diperoleh melalui https://topex.ucsd.edu/cgi-bin/get_data.cgi tersebar sebanyak 566 titik di Semenanjung Muria. Nilai anomali yang didapatkan direduksi dengan beberapa koreksi dan didapatkan nilai Anomali Bouguer Lengkap (CBA). Pemisahan anomali regional dan residual menggunakan Secong Vertical Derivative. Pemodelan bawah permukaan menggunakan metode pemodelan kedepan (Forward Modelling). Pada pemodelan ini didapatkan sebaran densitas batuan sebesar 2,4 g/cm3 (lava basalt atau andesit), 2,43 g/cm3 (tufaan, lahar dan tufaan pasiran), 2,5 g/cm3 (batu pasir tufaan dan konglomerat tufaan yang bersisipan batu lempung), dan 2,7 g/cm3 (batu gamping pasiran dan batu gamping lempungan). Hasil pemodelan menunjukkan adanya patahan di sekitar Gunung Muria dan diidentifikasikan sebagai patahan Tempur dan Rahtawu.
Co-Authors Abdullah, Azar Rafliardi Agus Triyono Ananta, Aria Arga Ari Handono Ramelan Budi Legowo Darsono Darsono Doddy Sutarno Eko Teguh Paripurno Harjana Harjana Imam Arifin Iwan Yahya Krismonanto, Wisnu Nabila, Dhia Azmi Nugroho, Arif Rianto Nursodik, Fajar Pratiwi, Rizki Amalia Rahmat Gernowo Sakhina, Friska Ayu Salfas, Muhammad Sibarani, Ferdinan Hotman Susanto, Andika Dwi Cipta Syahrizal, Fadli Yohana Noradika Maharani