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All Journal Jurnal Mahasiswa Jurusan Teknik Sipil Rekayasa Sipil
Nabilla Syafa
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Civil Engineering, Building, Construction & Architecture

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Pengaruh Bentuk Pilar Jembatan Terhadap Tekanan Aliran dengan Pemodelan Numerik Nabilla Syafa; Indradi Wijatmiko; Alwafi Pujiraharjo
Jurnal Mahasiswa Jurusan Teknik Sipil Vol. 1 No. 2 (2024): Student Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Brawijaya

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Abstract

Sungai merupakan saluran terbuka yang dimensinya berubah seiring waktu, di mana aliran air biasanya bergerak dari hulu ke hilir mengikuti bentuk penampang saluran. Namun, penyempitan atau infrastruktur keairan dapat menghambat dan mengubah pola aliran, yang bervariasi dalam kecepatan, volume, dan tingkat bahaya. Keruntuhan jembatan akibat kegagalan kestabilan pilar jembatan menjadi penyebab yang paling sering terjadi. Permasalahan ini banyak dijumpai pada jembatan melintang sungai dengan posisi pilar di Tengah aliran sungai. Penelitian ini bertujuan untuk melakukan simulasi aliran di sekitar pilar jembatan dalam kondisi aliran sub kritis dan super kritis dengan menganalisis kecepatan aliran dan gaya tekan akibat tekanan aliran yang terjadi dan mengetahui pengaruhnya terhadap pilar jembatan. Penelitian ini mensimulasikan aliran di sekitar pilar jembatan dalam kondisi sub kritis dan super kritis, menggunakan tiga jenis penampang pilar: segi empat, kapsul, dan palung. Hasilnya menunjukkan bahwa tinggi muka air, kecepatan aliran, dan tekanan aliran berbeda-beda bergantung pada bentuk penampang pilar dan kedalaman saluran, dengan pilar palung terbukti paling efektif dalam menerima gaya tekan akibat aliran.
Correlation Analysis Between Inundation Depth and Land Cover Change in the Jatiroto Watershed, Lumajang, Indonesia Nabilla Syafa; Suharyanto, Agus; Wijatmiko, Indradi
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.5

Abstract

Understanding how land cover changes influence flood inundation is essential for effective watershed management in rapidly developing areas. This study investigates the correlation between inundation depth and land cover transformation in the Jatiroto Watershed, Lumajang, Indonesia, from 1995 to 2023. Using an integrated hydrologic–hydraulic modeling framework that combines GeoHECRAS and GIS, flood depths were simulated under multiple land-cover scenarios derived from Landsat imagery. Spearman’s rank correlation analysis was then applied to quantify the relationships between inundation depth and specific land cover classes. The results indicate that converting natural vegetation to urban and agricultural uses significantly increased the extent and depth of flood inundation. From 1995 to 2023, flooded areas expanded from 12.88% to 15.66%, while the mean inundation depth increased by approximately 0.4 m. The statistical analysis revealed strong positive correlations between inundation depth and open land (? = 0.819), residential areas (? = 0.757), and wetlands (? = 0.743), whereas forest cover exhibited a strong negative correlation (? = –0.819). These findings demonstrate that the expansion of impervious surfaces directly elevates flood severity, while vegetation plays a vital mitigating role. This study provides a comprehensive understanding of the statistical relationship between land-cover composition and flood behavior, offering valuable insights for flood risk management, zoning policy, and sustainable watershed planning in tropical regions.
Coupling Hydrodynamic Inundation Modeling with Flood Risk and Economic Loss Analysis Under Land Cover Change Wijatmiko, Indradi; Agus Suharyanto; Aulia Febianda Anwar Tinumbang; Regina Salsabila Athallah; Nabilla Syafa
Rekayasa Sipil Vol. 20 No. 3 (2026): Rekayasa Sipil Vol. 20 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.03.15

Abstract

Land-cover change is a major driver of rising flood risk in river catchments, including the Jatiroto Catchment in Lumajang Regency, East Java. Previous studies have mainly examined river flow, land-use impacts on discharge, or erosion separately, with limited integration of spatial inundation modeling, disaster risk, and economic loss assessment. This study addresses this gap through a two-stage framework. First, a two-dimensional flood model was developed for three land cover conditions (1995, 2014, and 2023) and four rainfall return periods (2, 5, 10, and 25 years). Second, the resulting inundation maps were used to assess disaster risk and estimate economic losses across 44 villages in the lower catchment. The model was validated against the 23–24 December 2018 flood event in Rowokangkung and Sidorejo, showing reasonable agreement with field observations. Built-up land increased from 4.0% in 1995 to 15.9% in 2023, accompanied by increased inundation under all return periods. Flood extent was strongly and positively correlated with open land and settlements and strongly and negatively correlated with forest cover. Economic losses increased from IDR 185.3 billion in 1995 to IDR 540.1 billion in 2023, despite a temporary decline in 2014. Inundated area was the strongest predictor of economic loss. Kaliboto Lor, Rowokangkung, and Sidorejo consistently ranked among the highest-risk and highest-loss villages. The integrated framework provides a practical basis for flood mitigation, budget prioritization, and adaptive spatial planning in the Jatiroto Catchment.
Co-Authors Agus Suharyanto Agus Suharyanto Alwafi Pujiraharjo Aulia Febianda Anwar Tinumbang Indradi Wijatmiko Indradi Wijatmiko Regina Salsabila Athallah