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All Journal PARENTAS: Jurnal Mahasiswa Pendidikan Teknologi dan Kejuruan Journal of the Civil Engineering Forum
Empung
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Automotive Engineering Civil Engineering, Building, Construction & Architecture Education Engineering Transportation

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The Effectiveness of Groin Modifications to Reduce the Impacts of Indian Ocean Dipole (IOD)-induced Port Siltation in Adapting to Climate Change Romdani, Andhy; Amanulloh, Fahmi Rahmat; Mudatsir; El Ghifari, Muhammad Raka; Gusnadi, Zakwan; Putri, Tryantini Sundi; Empung; Al-Huseiny, Mohammad Syarif
Journal of the Civil Engineering Forum Vol. 11 No. 2 (May 2025)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.16683

Abstract

Climate anomalies significantly affect coastal hydrodynamics, influencing sediment transport processes. The interaction between waves and currents plays an important role in sediment transport, which is closely related to climate anomalies, particularly the Indian Ocean Dipole (IOD). Indonesia is currently facing severe threats from port siltation due to the impacts of climate change. Port siltation results from sediment transport and can reduce the effectiveness and safety of port activities. This study aims to investigate sediment transport processes at Titan Coal Port under the influence of the IOD in 2016 and 2019. This port is located on the western coast of Sumatera, where high waves from the Indian Ocean pose a risk. Groins and a breakwater have been installed to protect the port from littoral drift induced by southeastern longshore currents and waves. However, the study found that during the negative IOD in 2016, hydrodynamic conditions led to shallowing of the port basin and navigation channel due to longshore currents from the northeast. The methods used in this research include descriptive analysis (using ERA-5 data from the Copernicus Climate Change Service) and numerical modeling (using MIKE 21) with bed level change identification at several points after groin modification scenarios. The combination of tidal currents and waves primarily shaped current patterns in the study area. High-speed currents caused significant erosion upstream at the bed level of the port basin. However, modified groin installations effectively reduced flow velocity entering the port basin. Two modified groin installation scenarios were tested in the study area to alter existing coastal hydrodynamics and sediment transport patterns.
ANALYSIS OF COORDINATION BETWEEN SIGNALLED INTERSECTIONS (CASE STUDY: RANCABANGO INTERSECTION AND BANTAR INTERSECTION, TASIKMALAYA CITY) Mentari Pagi Febriana; Andhy Romdani; Empung
PARENTAS: Jurnal Mahasiswa Pendidikan Teknologi dan Kejuruan Vol. 11 No. 2 (2025): Journal Parentas Edisi Juli-Desember 2025
Publisher : Jurusan Pendidikan Teknologi Dan Kejuruan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37304/parentas.v11i2.23769

Abstract

The large number of intersections in Tasikmalaya City, particularly the nearby Rancabango and Bantar intersections, causes vehicles to frequently stop at each intersection due to red lights. To reduce delays and queues, an analysis of coordination between signalized intersections was conducted. Data was collected through field surveys conducted from April 21, 2025, to May 6, 2025, covering geometric data, signal timing, traffic volume, and vehicle speed. The analysis was conducted using the 2023 Indonesian Road Capacity Guidelines. The results showed that the two intersections were not yet coordinated. From the three plans, a new cycle time of 71 seconds was obtained with an offset of 60 seconds between the Rancabango Intersection and the Bantar Intersection and a bandwidth of 18 seconds for the direction of movement from the Rancabango Intersection to the Bantar Intersection and 31 seconds for the opposite direction. With the implementation of coordination between signalized intersections, intersection performance showed improvement, marked by a decrease in vehicle queue length from 69.22 meters to 62.39 meters and a decrease in average delay from 36.75 seconds/SMP to 35.63 seconds/SMP.
Co-Authors Al-Huseiny, Mohammad Syarif Amanulloh, Fahmi Rahmat Andhy Romdani Andhy Romdani, Andhy El Ghifari, Muhammad Raka Mentari Pagi Febriana Mudatsir Putri, Tryantini Sundi Zakwan Gusnadi