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All Journal BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Cerdika: Jurnal Ilmiah Indonesia Geosfera Indonesia
Handini, Devi Ratna
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Humanities Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Health Professions Public Health Social Sciences Transportation

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Flash Flood Susceptibility Mapping at Andungbiru Watershed, East Java Using AHP-Information Weighted Method Devi Ratna Handini; Entin Hidayah; Gusfan Halik
Geosfera Indonesia Vol. 6 No. 2 (2021): GEOSFERA INDONESIA
Publisher : Department of Geography Education, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/geosi.v6i2.24173

Abstract

Flash floods are among the most frequent natural disasters caused by heavy rain associated with a severe thunderstorm, which leads to social and economic losses in infrastructure and agriculture. Therefore, this research aims to map flash flood potential susceptibility (FFPS) in the Pekalen watershed, using Geographic Information System (GIS) technology and statistical analysis to reduce the risk of flooding. The opinion and experience of an expert on the weight assessment method were carried out using the Analytical Hierarchy Process (AHP). Furthermore, the probability statistical methods and GIS were used in flash flood areas in the Pekalen watershed in Andungbiru, Probolinggo village. This study was carried out using geomorphological factors, namely elevation, slope, stream power index, and topographic wetness index, with a resolution of 30 m. Thematic map scale of the land use, river density, distance to the river, rainfall, and geology is in the ratio of is in a ratio of 1:25.000. Imagery processing was carried out using Landsat 8 30 m x 30 m resolution imagery, such as the Normalized Difference Vegetation Index. The result showed that the model map of FFPS obtained low 8%, low 23%, moderate 27%, moderate to high 26%, high 13%, and very high 2% index values. The next stage of modeling analysis led to validation using statistic receiver operating Characteristic Curve (ROC) of area Under Curve (AUC) with a value of 90.15. In conclusion, the factors that significantly trigger flash floods are distance to the river, land use, and slope. Keywords: AHP-weighted; information content; FFSP; GIS; Geomorphology Copyright (c) 2021 Geosfera Indonesia and Department of Geography Education, University of Jember This work is licensed under a Creative Commons Attribution-Share A like 4.0 International License
Analisis Sub-Struktur Menara BTS pada Area dengan Daya Dukung Tanah yang Rendah Cahyono, Heru Setiyo; Arief, Lukman; Soedjarwoko, Endrik; Handini, Devi Ratna
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 13 No 2 (2025): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (July 2025)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v13i2.10805

Abstract

The construction of BTS towers to fulfill equitable communication requires analysis of structural construction calculations so the tower can be standing properly in locations that have low soil bearing capacity. This research aims to analyze the design of the BTS tower sub-structure to withstand in structural loads, wind, overturning, and uplift forces so the tower can be standing properly. To achieve the research objectives, studies and analyses were conducted through literature study, load analysis, structural modeling through software analysis and interaction diagrams, evaluation of soil bearing capacity, and verification of applicable construction standards in Indonesia. The analysis shows the dead load of the sub-structure, the overturning moment of 6.539 x 10³ kN.m in the X direction and 5.352 x 10³ kN.m in the Y direction meet the safety value of 1, thus ensuring stability according to SNI 8460: 2017. The maximum ground pressure is 97,808 kN/m², below the required 294,200 kN/m² at a depth of 1.4 m, with safety factors of soil bearing capacity (3.008), shear capacity (2.897), and shear strength (1.5) all meeting safety standards. The reinforcement analysis follows SNI 03: 2847-2019, specifying that D16-200 reinforcement is required for bottom and top with a ratio of 0.002 and 0.001. Torsional shear for axial (1,225 x 10³ kN.m) and compression (1,578 x 10³ kN.m) stress conditions, as well as ratios exceeding 1% ensure the safety of the support. Overall all structural elements meet the safety requirements, ensure the stability of the tower and comply with relevant standards.
Potensi Pengelolaan Sampah dan Limbah Peternakan Berbasis Integrated Resources Recovery Center (IRRC) Handini, Devi Ratna; Setyaningtyas, Rusdiana
Cerdika: Jurnal Ilmiah Indonesia Vol. 6 No. 1 (2026): Cerdika: Jurnal Ilmiah Indonesia
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/cerdika.v6i1.3278

Abstract

Pujon and Ngantang Sub-districts are agrarian–livestock areas in Malang Regency characterized by high generation of municipal solid waste and livestock manure. This study aims to analyze the potential for waste and manure management based on an Integrated Resources Recovery Center (IRRC) using a quantitative–statistical approach to waste generation, waste composition, and livestock waste production data. The methods employed include descriptive statistical analysis, per capita–based waste generation estimation, a seven-day consecutive waste composition survey, and manure production estimation using standard assumptions from the literature. The results indicate that the average municipal solid waste generation reaches 29.22 tons/day in Pujon and 24.55 tons/day in Ngantang, with a dominance of organic waste in Pujon (52.38%) and RDF fractions in Ngantang (40.23%). Meanwhile, the combined manure production of both sub-districts reaches 1,124.54 tons/day, with a realistic recoverable potential of 112.45–224.91 tons/day. These findings confirm that the development of an integrated IRRC system combining composting, RDF production, and manure utilization is technically feasible and strategically important for supporting sustainable environmental management and the implementation of a circular economy in the study area.
Co-Authors Arief, Lukman Entin Hidayah Gusfan Halik Heru Setiyo Cahyono Rusdiana Setyaningtyas Soedjarwoko, Endrik