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All Journal HAYATI Journal of Biosciences Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of Degraded and Mining Lands Management Rekayasa Sipil Proceedings ACES (Annual Civil Engineering Seminar) Jurnal Teknik JURNAL ENGGANO RACIC : Rab Construction Research Syntax Literate: Jurnal Ilmiah Indonesia Civil Engineering Dimension Jurnal Sinergitas PkM & CSR Riau Journal of Empowerment Seminar Nasional Lahan Suboptimal JURNAL SAINTIS Jurnal Teknik Sipil dan Teknologi Konstruksi APTEK Jurnal Abdi Insani Madaniya SELODANG MAYANG Unri Conference Series: Community Engagement Jurnal Zona Jurnal UNITEK Dinamika Lingkungan Indonesia Journal of Infrastructure and Civil Engineering Makara Journal of Technology SAINSTEK Jurnal Teknologi & Rekayasa Sipil EcoNews JP2N: Jurnal Pengembangan Dan Pengabdian Nusantara
Sutikno, Sigit
Department Of Civil Engineering, Faculty Of Engineering, University Of Riau, Pekanbaru
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Predictive model for California Bearing Ratio (CBR) in expansive coastal subgrades: a rapid geotechnical assessment for degraded and marginal lowland areas Nugroho, Soewignjo Agus; Satibi, Syawal; Putra, Agus Ika; Zulkifli, Zulkifli; Sutikno, Sigit; Yusa, Muhamad; Rinaldi, Rinaldi; Yamamoto, Koichi
Journal of Degraded and Mining Lands Management Vol. 13 No. 1 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.131.9329

Abstract

In geotechnical engineering, professional actions and expert judgment are often essential in soil investigation methods. In lowland and coastal areas, expansive, fine-grained soils and sandy sedimentation lead to reduced bearing capacity, posing significant challenges for sustainable infrastructure development on marginal and degraded lands. Such conditions are prevalent in post-mining or naturally poor coastal environments, necessitating cost-effective and rapid assessment tools. This study modeled a clayey sand mixture using bentonite and kaolin as fine fractions, which exhibit expansive behavior and poor gradation, simulating worst-case geotechnically degraded subgrades. The mechanical behavior of the soil was evaluated through modified compaction, using the CBR test and CPT test as bearing capacity parameters. Soil mixtures were simulated with sand fractions ?65% and bentonite-kaolin compositions with ?50% bentonite. Compaction was modeled using variations in energy compaction and water content under conditions below the maximum dry density. CBR prediction was conducted using Qc as the primary predictor and dry density as a supporting predictor. A hybrid stepwise regression analysis in the         Z-score scale identified positively correlated predictors: +3.00 (Qc), +0.55 (?dry), and +1.28 (Qc ?dry interaction). The regression model showed strong statistical performance with R² = 0.84 and high significance with the lowest p-values. The resulting regression equation offers an applicable approach to rapidly evaluate the bearing capacity of subgrade soils in degraded coastal or marginal conditions, thereby facilitating geotechnical engineering design and initial site assessment crucial for land management and rehabilitation actions.
Vegetation Structure and Species Composition Along a Canal-Distance Gradient Across Different Peatland Land Use Types Silviana, Sinta Haryati; Saharjo, Bambang H.; Sutikno, Sigit; Vetrita, Yenni
HAYATI Journal of Biosciences Vol. 33 No. 3 (2026): May 2026
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.33.3.694-703

Abstract

Tropical peatlands are critical ecosystems that provide habitat for biodiversity and store large amounts of carbon, yet they are increasingly degraded due to land-use conversion, drainage, and recurrent fires. This study examined vegetation structure and species composition along a canal-distance gradient (10-350 m across three peatland land-use types: rubber plantation, secondary forest, and burned peatland. Vegetation surveys were conducted using 40 nested plots covering four growth strata (trees, poles, saplings/shrubs, and seedlings/herbs). Community structure was analyzed using the Importance Value Index (IVI), Shannon–Wiener diversity index (H′), Margalef’s richness index (DMg), Pielou’s evenness index (E), and Simpson’s dominance index (C). Differences in environmental parameters among land-use types were tested using one-way ANOVA (p<0.05). Secondary forests exhibited the highest species richness and diversity with balanced structural complexity, whereas rubber plantations showed simplified communities dominated by Hevea brasiliensis. Burned peatlands were characterized by pioneer tree species and dense fern understorey, indicating successional arrest. Secondary forests had higher biodiversity than rubber plantations, which in turn had higher biodiversity than burned peatlands. These findings highlight that land-use intensity, canal proximity, and fire history jointly regulate vegetation dynamics in tropical peatlands and highlight the importance of forest conservation, plantation diversification, and restoration through rewetting and enrichment planting.
Analisis Indeks Kekeringan Lahan Gambut di Kabupaten Siak Menggunakan Google Earth Engine (GEE) Rinaldi, Rinaldi; Sutikno, Sigit; Sari, Indah Permata
Jurnal Teknologi dan Rekayasa Sipil Vol. 4 No. 2 (2025): VOL 4 NO 2 (NOVEMBER 2025)
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Drought is a condition in which rainfall falls below normal for a certain period and becomes a major threat to the sustainability of peatlands, as it can increase the risk of forest fires. This study analyzes the drought index in the peatlands of Siak Regency using the Standardized Precipitation Index (SPI) method based on CHIRPS satellite data on the Google Earth Engine (GEE) platform, and evaluates the relationship between SPI values and Groundwater Table Depth (TMAT). The CHIRPS rainfall dataset used to calculate SPI spans the period from 1993 to 2024. SPI values were then compared with groundwater table depth at three locations from 2019 to 2024 to assess the relationship between the two variables. The results indicate spatial and temporal connections within the study area, with several drought periods occurring simultaneously. The most significant drought event occurred in 2019, with peak intensity in August, affecting the entire study region. Regression analysis between SPI and groundwater table depth revealed a positive relationship, indicating that when rainfall decreases or SPI values are negative, the groundwater table tends to decline. However, the correlation was relatively weak, likely influenced by other factors such as peat soil characteristics, evapotranspiration, drainage, human activities, and others. Nevertheless, the relationship between these two variables can serve as a preliminary step in utilizing SPI as an importan
Spatial and temporal analysis of wild peat fire on island peatlands using remote sensing data Sutikno, Sigit; Hidayati, Nur; Ahmad Muhammad; Qomar, Nurul; Yamamoto, Koichi
Journal of Degraded and Mining Lands Management Vol. 13 No. 3 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.133.10773

Abstract

Indonesia has the largest areas of tropical peatland, which is becoming vulnerable to fires. Smoke haze crises due to forest fires that occur annually have plagued many parts of Southeast Asia between 2013-2015 with devastating effects on human health and economy. Fires spread fast on island peatlands in eastern Sumatra because their small catchments drain quickly into the sea. This research dived into the spatial and temporal patterns of peat wildfires in the Peat Hydrological Unit of Bengkalis Island. Drawing on remote sensing sources such as MODIS-C6 Terra/Aqua thermal hotspots from 2001 to 2020 and Landsat images, the findings revealed two clear yearly fire peaks in Bengkalis: Period I (January-March) and Period II (June-August). Hotspot density was concentrated in deep peat areas 57.3% of detections are from the 500-700 cm thickness class, and 93.1% from peat >300 cm. During 20 years, 343 fire-days burned a total of 56,202 ha; the largest single occurrence involved a burnt area of 19,999 ha in 2014. Monthly rainfall is the dominant climatic control, exhibiting a clear inverse relationship with hotspot frequency; rainfall below 100 mm/month defines elevated fire-risk conditions. These findings establish that MODIS hotspot monitoring combined with Landsat burned area mapping provides a robust long-term fire assessment framework, and that rainfall thresholds offer a practical operational basis for fire early warning systems on island peatlands.
Model Hidrologi Prediksi Fluktuasi TMAT Lahan Gambut di Pesisir Bengkalis Yondriadi Yondriadi; Sigit Sutikno; Muhamad Yusa
SAINSTEK Vol. 14 No. 1 (2026)
Publisher : Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/js.v14i1.420

Abstract

ANALISIS INDEKS KEKERINGAN METEOROLOGIS MENGGUNAKAN METODE STANDARDIZED PRECIPITATION INDEX DI KABUPATEN PELALAWAN Yogi Guntara; Sigit Sutikno; Lita Darmayanti
Racic : Rab Construction Research Vol. 8 No. 1 (2023): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v8i1.3183

Abstract

Drought is one of the natural phenomena indicated by the limited availability of water above, on the surface and in the ground. Pelalawan District has a history of drought which occurred in 2015 and resulted in a water crisis. Drought index measurement with the help of spatial techniques is often the key in assisting monitoring to determine drought prevention measures. This study conducted a spatial analysis to determine the distribution of drought using the Standardized Precipitation Index (SPI) method a 3-month time scales. This research used monthly satellite rainfall from 2010-2019. The results of the analysis show that extreme drought conditions occurred in June 2015 in Kuala Kampar sub-district with a value of -3.70.
Co-Authors ', Fitriani Achmad Noerkhaerin Putra Ade Mustika Martin Adri Patria Ganda Agus Ika Putra Ahmad Ade Kurniawan Ahmad Fauzi Ahmad Muhammad Ahmad Muhammad Ahmad Muhammad Ahmad Nawawi Ahmad Nurhuda Akhbar Putra Alkhair, Hafidz Almanna, Fajri Almasdi Syahza Aminuyati Andi Darmawan Andri Sulistyani Andy Hendri, MT, Andy Ari Sandhyavitri Ariani Kurnia, Ariani Arif Hidayatullah Arifudin Arifudin Aris Fadillah Asda Usradinda Bambang H. Saharjo Bambang Sujatmoko Besri Nasrul Daly Riandi Defarian, Alvin Dewi , Novia Dewi, Dian Kharisma Diego Ariesta Lintano Dina Aulia Fitri Dwi Puspo Handoyo Dwi Puspo Handoyo, Dwi Puspo Dzaki Naufal Edi Kurniawan Eka Saputra Fauzi, Manyuk Febiola, Ollga Ferry Fatnanta Fian Syauqi Firdaus Firdaus Fitri Landari Fitriani Fitriani Frans Alfredo Hutapea Galuh Rio Harto, Galuh Rio Genta Putra Adietama Gina Khusnul Khotimah Gunandar, Arifa Gunawan, Irvan Gustin, Silvie Welya Hadthya, Reinhart ' Hafiz Alfarisyi Hapsoh Hardi Daim Hendra Saputra Herli Fajri Hidayat, Muhammad Fikky Hilda Febrina Hugo Pratama Idwar, Idwar Ilham Ziaulhaq Ilvi Rahmi Amalia Indah Permata Sari Indradi Wijatmiko Indratmo Soekarno Insan Ikhsan Irfan, Riza Irpan, Apdani Jailani Jailani Jeffi Annisa Junius Nainggolan Karunia, Ariani Kei Mizuno Keisuke Murakami Keisuke Murakami Khairijon Khairijon Koichi Yamamoto Koichi Yamamoto Koichi Yamamoto Koichi Yamamoto, Koichi Kusairi, Muhammad Lilianti Lilianti Lita Darmayanti Luh Putu Ratna Sundari Lyona, Vinka M Fadhil Nur Mairiza Mairiza Mandataris Mardhotillah, Mutia Marlaily Idris Martin, Ade Mustika Melani Humairoh Merian, Rena Dian Metananda, Arya Arismaya Michiko Hosobuchi Milka Novita Manalu Mitri Irianti Mohtar Anwar Monita Olivia Mubarak Mubarak Mubarak Mubarak Mubarak Mudjiatko Mudjiatko Muhamad Yusa Muhammad Agung Pribadi Muhammad Fikky Hidayat Muhammad Kusairi Muhammad Nur Fajri Muhammad Randy Alfath Muhammad Yusa Muhammad Yusa Muhammad Yusa Mutia Ananda Perdana Neneng Sari Nensi Niko Erdi Putra Nur Hidayati Nur Hidayati Nurul Qomar Okta Karneli, Okta Osamu Kozan Panji Tegar Aji Pratama, Deni Pratama, Fernando putri, Novalin Putri, Tasha Ramadhery Radith Mahatma Rafit Mahendra Rahma Setya Linggasari, Rahma Setya Rahmatul Irfan Rahmayati Aprillia Putri Randa Kurniawan Refri Fadillah Rena Dian Merian Reski Daini Ramawilis Reza Ahmad Fadhli Reza Ahmad Fadhli, Reza Ahmad Rifandri, Danus Rifardi Rinaldi Rinaldi Rinaldi Rinaldi Rinaldi Rinaldi Rizki Rianda Putra Rizki Sahputra Romie Jhonnerie Roza Wahyuni S Siswanto Saldanela Saldanela Satibi, Syawal Seno Andri Setia Dewi Nurza Silviana, Sinta Haryati Sinta Afdeni Soewignjo Agus Nugroho Swary Aristi Syahrul Ramadhani Syamsul Arifin Syofiatul Safitri Syuhaya Wanisakdiah Teuku Ichsan Nurrady Theo Hasido Silalahi Tina Andriani Wahyu Frisnel Wardani, Khusnul Setia Wawan Gunawan Widya Ayu Safitri Wikrine Teriyoko Wiliya Wiliya Wiliya, Wiliya Yearni Yudika Friniati Putri Yenni Vetrita, Yenni Yesy Dian Permatasari, Yesy Dian Yogi Guntara Yogi Guntara Yohanna Lilis H Yondriadi Yondriadi Yosafat Sijabat Yuli Hendra Yundari, Yundari Zuli Laili Isnaini Zulkarnain Yusuf Zulkifli Zulkifli