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All Journal Journal of Engineering and Technological Sciences JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Jurnal Ilmiah Geologi pangea
Kartiko, Rendy Dwi
Institut Teknologi Bandung
Earth & Planetary Sciences Energy Engineering Environmental Science

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Metode Kombinasi Weight of Evidence (WoE) dan Logistic Regression (LR) untuk Pemetaan Kerentanan Gerakan Tanah di Takengon, Aceh pamela pamela; Imam A. Sadisun; Rendy Dwi Kartiko; Yukni Arifianti
Jurnal Lingkungan dan Bencana Geologi Vol 9, No 2 (2018)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2319.397 KB) | DOI: 10.34126/jlbg.v9i2.219

Abstract

ABSTRAKPeta kerentanan gerakan tanah sangat diperlukan sebagai dasar dalam perencanaan tata ruang, pemanfaatan lahan dan mitigasi bencana. Kerentanan gerakan tanah dipengaruhi oleh beberapa faktor seperti kemiringan lereng, arah lereng, litologi, tutupan lahan, elevasi, curah hujan, kelurusan, percepatan gempabumi, kurvatur, arah aliran, jarak dari sungai, dan jalan. Dalam penelitian ini dikembangkan metode pemetaan kerentanan gerakan tanah menggunakan metode kombinasi logistic regression (LR) – weight of evidence (WoE). Metode gabungan ini diharapkan dapat menghasilkan metoda yang menggabungkan kelebihan dari masing-masing metode serta sekaligus mengatasi kelemahan masing-masing metode. Wilayah studi kasus penelitian adalah Takengon, salah satu wilayah di Provinsi Aceh yang rawan terhadap bencana gempabumi dan gerakan tanah. Data yang digunakan dalam penelitian ini adalah 251 kejadian gerakan tanah secara acak yang terjadi pada tahun 2000 hingga tahun 2016. Data tersebut dibagi menjadi dua kelompok data, 70% data digunakan sebagai set data analisis untuk penyusunan model dan 30% data digunakan sebagai set data validasi untuk pengujian model. Tahapan penelitian meliputi pembobotan dua belas parameter yang mempengaruhi kerentanan gerakan tanah dengan menggunakan metode WoE. Analisis kombinasi LR-WoE menggunakan parameter hasil pembobotan metode WoE dan kemudian di analisis menggunakan statistik LR. Selanjutnya melakukan analisis perbandingan hasil pemetaan kerentanan gerakan tanah melalui pengujian kurva Receiver Operating Characteristic (ROC). Hasil validasi dan pengujian model menunjukkan bahwa metode kombinasi LR-WoE mempunyai nilai AUC 0,853 yang lebih tinggi dibandingkan menggunakan metode WoE (AUC 0,830). Berdasarkan hasil penelitian ini disimpulkan bahwa metode kombinasi LR-WoE memberikan tingkat akurasi yang lebih baik dari metode WoE untuk pemetaan kerentanan gerakan tanah. Metode kombinasi LR-WoE dapat terus dikembangkan dan dapat diusulkan menjadi metode pemetaan gerakan tanah yang akurat, efektif dan ekonomis. Kata kunci: Kerentanan gerakan tanah, Logistic Regression, Takengon, Weight of Evidence. ABSTRACTLandslide susceptibility map is an imperative basic tool for land use application, spatial planning and disaster mitigation. The susceptibility of landslide is influenced by factors such as slope, slope aspect, lithology, land cover, elevation, rainfall, linemeant, peak ground acceleration, curvature, flow direction, distance from rivers, and roads. In this research, a combined method of weight of evidence (WoE) and logistic regression (LR) was applied to assessed its advantages and overcome the limitation of each method. Takengon is an area prone to earthquake disaster and landslide. The 251 landslides from 2000 until 2016 were randomly divided into two groups of modelling/training data (70%) and validation/test data sets (30%).  The research stages include weighting of twelve parameters that affect the susceptibility of landslide using the WoE method. The combination LR-WoE analysis uses the weighted parameter of the WoE method and then analyzed using LR statistics. The validation results using Receiver Operating Characteristic (ROC) curve showed that the LR-WoE method had a better accuracy than the WoE methods, with values of 0,890 higher than that of the WoE method 0,830 prediction. Therefore, it is concluded that the combined method of LR and WoE can provide a promising level of accuracy for landslide susceptibility mapping. Combined LR-WoE method can be developed and proposed to be an accurate, effective and economical method of mapping the landslides susceptibility map. Keywords: Kerentanan gerakan tanah, Logistic Regression, Takengon, Weight of Evidence. 
Variability of N-SPT-Correlated Undrained Shear Strength of Alluvial Deposit in Doplang Region, Central Java, Indonesia Sugeng Krisnanto; Masyhur Irsyam; Rendy Dwi Kartiko; Arif Rahman Hakim Sitepu; Mohammad Anwar Fathoni; Ina Asha Nurjanah; Shafira Annisa Putri; Lindawati Lindawati; Maudy Anisa Fanani; Alexander Wicaksono Budiarto; Idrus Muhammad Alatas
Journal of Engineering and Technological Sciences Vol. 55 No. 6 (2023)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2023.55.6.3

Abstract

The need to better quantify the variability of soil shear strength and its relations with the factor of safety is increasing in Indonesia. However, this aspect has not yet been studied thoroughly. This paper presents an attempt to quantify the variability of undrained shear strength in relation with the factor of safety of an alluvial deposit in the Doplang region, Central Java, Indonesia. A relationship between the undrained shear strength, su, and N-SPT for the deposit was found as su = 3.4 N-SPT. The variability of the undrained shear strength was quantified utilizing the coefficient of variance, s/m (the sample standard deviation, s over the mean, m) of the N-SPT correlated undrained shear strength. The variability of the undrained shear strength was investigated for the soil near ground surface. The deposit had a value of s/m ranging from 0.15 to 0.25 near ground surface. The variation of s/m tended to follow normal and lognormal distributions. Relationships among the coefficient of variance, the probability of failure, and the factor of safety in terms of soil strength for normal and lognormal distributions were developed. For the value of s/m near ground surface, the relationship between the probability of failure and factor of safety was obtained.
ANALISIS RESPON STATIK DAN DINAMIK PADA BAGIAN BENDUNGAN URUGAN DARI BENDUNGAN MELATI Ramadhan, Gumilar; Kartiko, Rendy Dwi; Taufiq, Ahmad; Irawan, Dasapta Erwin
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 3 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i3.502

Abstract

ABSTRAKDalam pembangunan dan operasionalnya, bendungan dapat mengalami kerusakan. Salah satu faktor yang dapat mengakibatkan kerusakan pada bendungan yaitu gempa bumi. Kerusakan tersebut jika tidak diantisipasi dapat mengakibatkan kegagalan dan bencana yang dapat berakibat kerugian materil dan jiwa. Untuk menghindari bencana maka diperlukan perencanaan yang baik sebelum pembangunan. Respon bendungan, baik kondisi statik dan dinamik, perlu diketahui untuk mengevaluasi keamanan dari desain bendungan. Bendungan Melati direncanakan merupakan bendungan komposit dengan jenis bendungan urugan zonasi pada sisi kiri dan bendungan roller-compacted concrete (RCC) pada sisi kanan. Analisis menggunakan metode finite element dilakukan terhadap bagian bendungan urugan. Analisis respon statik secara sequential menggunakan 23 lift didapatkan adanya settlement berbentuk oval pada tengah core dengan settlement terbesar 34 cm dan displacement horizontal sebesar 8 cm menuju sisi downstream di akhir konstruksi. Pada penelitian ini digunakan rekaman akselerasi berdasarkan deaggregrasi analisis seeismic hazard untuk tiga mekanisme gempa berbeda yang kemudian dilakukan spectral acceleration amplification terhadap PGA. Berdasarkan parameter controlling earthquake digunakan gempa Tohoku dengan amplifikasi 0.8 untuk mekanisme megathrust, gempa Iwate dengan amplifikasi 2.5 untuk mekanisme patahan, dan gempa Patea dengan amplifikasi 4.3 untuk mekanisme shallow crustal. Deformasi permanen berdasarkan analisis stress redistribution pada akhir gempa didapatkan deformasi terbesar yaitu 22 cm untuk gempa Tohoku, 29 cm untuk gempa Iwate, dan 19.9 cm untuk gempa Patea. Berdasarkan analisis keamanan lereng bendungan memiliki keamanan yang sangat baik pada kondisi statik dan cukup pada kondisi dinamik. Walau demikian, faktor keamanan di sisi upstream mendekati 1 pada akhir gempa Tohoku dan Iwate dan diasumsikan tidak aman.Kata kunci: analisis numerik, analisis respon statik, analisis respon dinamik, analisis stabilitas, BendunganABSTRACTDuring construction and operation, dams can experience damage. One factor that can cause damage to a dam is an earthquake. If this damage is not anticipated, it can result in failure and disaster which can result in material and life losses. To avoid such disasters, good planning is needed before construction. The response of the dam, both static and dynamic conditions, needs to be known to evaluate the safety of the dam design. The Melati dam is planned to be a composite dam with a zoned fill dam on the left side and a roller-compacted concrete (RCC) dam on the right side. Analysis using the finite element method was carried out on the embankment dam section. Sequential static response analysis using 23 lifts showed that there was an oval-shaped settlement in the middle of the core with the largest settlement of 34 cm and a horizontal displacement of 8 cm towards the downstream side at the end of construction. In this study, acceleration recordings were used based on deaggregation of seismic hazard analysis for three different earthquake mechanisms and then spectral acceleration amplification was carried out based on the obtained PGA. Based on the controlling earthquake parameters, the Tohoku earthquake was used with an amplification of 0.8 for the megathrust mechanism, the Iwate earthquake with an amplification of 2.5 for the fault mechanism, and the Patea earthquake with an amplification of 4.3 for the shallow crustal mechanism. Permanent deformation based on stress redistribution analysis showed that the largest deformation was 22 cm for the Tohoku earthquake, 29 cm for the Iwate earthquake, and 19.9 cm for the Patea earthquake. Based on the safety analysis, the dam slopes have very good safety factors in static condition and sufficient in dynamic conditions. However, factor of safety on the upstream side are close to 1 at the end of Tohoku and Iwate earthquakes which was assumed to be not safe.Keywords: numerical analysis, static response analysis, dynamic response analysis, stability analysis, Dam
Evaluating the Causes of Land Subsidence in Central Jakarta using 1-Dimensional Consolidation Approach Naufal, Muhammad Adi; Sadisun, Imam Achmad; Kartiko, Rendy Dwi; Septiandi, Muhammad Iqbal
Jurnal Ilmiah Geologi PANGEA Vol. 11 No. 2 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i2.13643

Abstract

Land subsidence in Central Jakarta, driven by both natural geological processes and human-induced factors, threatens the stability of the region’s infrastructure. Monitoring of land subsidence with InSAR in Central Jakarta shows an average speed of 1-10 cm/year. Land subsidence in Central Jakarta presents a growing geotechnical challenge, exacerbated by both natural consolidation and anthropogenic influences. During the period of 2018 to 2023, Jakarta's booming industrial development became a major factor contributing to the city's ongoing land subsidence problem. This study aims to evaluate the contribution of consolidation and anthropogenic factors to land subsidence in Central Jakarta. The analytical method uses 1-D consolidation theory is applied to calculate land subsidence. Borehole data from nine locations were used to estimate subsidence rates. Results indicate that natural consolidation has significant role in land subsidence, which is predicted to continue until 2368. Anthropogenic factors such as groundwater level decrease and additional building loads accelerate the subsidence process. The rate of soil subsidence for natural consolidation in Central Jakarta ranges from 1.5-9.1 cm/year. Meanwhile, there are anthropogenic factors such as groundwater level decrease and increase of building load achieved 3.4-17.4 cm/year. These anthropogenic factors accelerate the rate of soil subsidence by 1.9-8.3 cm/year or equivalent to 26.0-47.7%. Based on analysis, land subsidence analysis in Central Jakarta shows that increase in building load and groundwater level decrease in five years does not significantly affect the subsidence that occurs. However, role of anthropogenic factors can exacerbate land subsidence in Central Jakarta. Groundwater extraction arrangements and building load management need to be considered to minimize the negative impact on infrastructure.
Co-Authors Ahmad Taufiq Alexander Wicaksono Budiarto Dasapta Erwin Irawan, Dasapta Erwin Idrus Muhammad Alatas Imam A. Sadisun Imam Achmad Sadisun Ina Asha Nurjanah Lindawati Lindawati Masyhur Irsyam Maudy Anisa Fanani Mohammad Anwar Fathoni Naufal, Muhammad Adi pamela pamela Ramadhan, Gumilar Septiandi, Muhammad Iqbal Shafira Annisa Putri Sitepu, Arif Rahman Hakim Sugeng Krisnanto Yukni Arifianti