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Muhammad Arsyad
Departmen of Physics, Universitas Negeri Makassar
Environmental Science

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Studi Tentang Sifat Fisis dan Kuat uji Tejan Batuan Karst Kawasaan Gua Leang Londrong Taman Nasional Bantimurung Bulusaraung Muhammad Arsyad; Dian Mukarramah; Agus Susanto
Jurnal Ilmu Lingkungan Vol 21, No 4 (2023): October 2023
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.21.4.789-795

Abstract

Telah dilakukan penelitian tentang sifat fisis dan kuat uji tekan batuan di karst Kawasan Gua Leang Londrong. Tujuan dari penelitian adalah untuk menganalisis besarnya nilai sifat fisis (densitas dan porositas) dan kuat uji tekan batuan. Penentuan kekerasan atau kuat tekan batuan selama ini banyak menggunakan uji kuat tekan batuan di laboratorium menggunakan Uniaxial Compressive Strength (UCS). Uji Uniaxial Compressive Strength (UCS) memiliki akurasi yang sangat baik, namun pelaksanaanya membutuhkan waktu yang lama dan memakan biaya tinggi. Oleh karena itu pada penelitian ini diusulkan metode lain untuk menentukan kuat tekan yang lebih sederhana, mudah dan murah menggunakan Schmidt Hammer. Nilai uji kuat tekan diperoleh dari metode non-destructive yaitu dengan menggunakan alat  Schmidt Hammer. Proses dimulai dari pengambilan 30 sampel batuan di daearah kawasan Gua Leang Londrong pada 10 titik yang telah ditentukan. Berdasarkan hasil uji sifat fisis batuan karst di Kawasan Gua Leang Londrong, diperoleh nilai densitas batuan pada rentang 2,60   sampai 2,62  dan nilai porositas berada pada rentang 0%-7%. Sehingga jenis batuan di Kawasan Gua Leang Londrong adalah batu gamping dolomit. Nilai kuat tekan batuan diperoleh dari konversi nilai pantulan palu Schmidt menjadi nilai kuat tekan uniaksial. Diperoleh nilai kuat tekan batuan berada pada rentang nilai 20 MPa hingga 62 MPa. Sehingga batuan di Kawasan Gua Leang  Londrong adalah jenis batuan yang sangat rapuh dengan karakteristik batuan lapuk sedimen terkompaksi lemah, batuan  rapuh  dengan karakteristik  batuan tersedimentasi lemah dan batuan yang cukup keras dengan karakteristik batuan sedimen kompeten beberapa batuan beku dengan bobot isi rendah berbutir kasar.
The Effects of El Nino Southern Oscillation on Rainfall in the Karst Area of Maros, National Park Bantimurung Bulusaraung South Sulawesi and its Impact on Flood Disasters Muhammad Arsyad; Fitriani Fitriani; Vistarani Arini Tiwow; Pariabti Palloan; Sulistiawaty Sulistiawaty; Agus Susanto
Jurnal Ilmu Lingkungan Vol 21, No 4 (2023): October 2023
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.21.4.772-780

Abstract

The aims of this study were to describe rainfall profiles, to analyze the effect of the El Nino Southern Oscillation (ENSO) on rainfall and its impact on flood disasters in the karst area of Maros, National Park Bantimurung Bulusaraung South Sulawesi. The data used were monthly data of ENSO parameters and monthly data on rainfall of Karst Maros TN Babul area in the range of 2011-2020. The monthly data of ENSO parameters consist of Oceanic Nino Index (ONI) data, namely Nino Index 3.4 and Southern Oscillation Index (SOI) obtained from the official website of NOAA (National Oceanic and Atmospheric Administration) and from the official website of BOM (Bureau of Meteorology), respectively. Whereas, the monthly data of rainfall of Karst Maros TN Babul area was obtained from Maros Climatology Station, South Sulawesi. The data was analyzed (i.e. graph analysis and simple linear regression) using Microsoft Excel 2010 Software and ArcGIS Software for map creation. The results showed that the rainfall profile of the karst Maros TN Babul region for the period 2011-2020 has a monsoon rainfall pattern with the highest rainfall in December, January, and February, while the lowest rainfall occurs in June, July, and August. The significant effect of ENSO on rainfall in the Karst Maros TN Babul Area for the period 2011-2020 was categorized as a moderate with an ONI correlation coefficient value of 0.521 and SOI of 0.465. The effect of ENSO on rainfall is in the range from 25.9 to 33.1% which result in flood disasters in the karst Maros TN Babul area such as Bantimurung, Tompobulu, Camba, and Simbang districts. The flood disasters mostly occurs in January and December with rainfall intensity from high to very high category.
Co-Authors Agus Susanto Dian Mukarramah Fitriani Fitriani Pariabti Palloan Sulistiawaty Sulistiawaty Vistarani Arini Tiwow