Design of Protective Structures to Anticipate Flood-Induced Damage to the Jenelata Bridge Abutment

Annisa Magefirah Darmawan; Basyar Bustan; Andi Maal Latief

Annisa Magefirah Darmawan Magister of Applied Science, Bridge Maintenance and Restoration, Civil Engineering, Politeknik Negeri Ujung Pandang, Makassar, Indonesia
Basyar Bustan Magister of Applied Science, Bridge Maintenance and Restoration, Civil Engineering, Politeknik Negeri Ujung Pandang, Makassar, Indonesia
Andi Maal Latief Magister of Applied Science, Bridge Maintenance and Restoration, Civil Engineering, Politeknik Negeri Ujung Pandang, Makassar, Indonesia

Keywords: Jenelata Bridge, flash flood, abutment, gabion, rehabilitation

Abstract

The extreme flood in January 2019 caused significant damage to the Jenelata Bridge in Gowa Regency, including the collapse of protective structures and disruption of abutment stability. This study aims to design protective structures capable of preventing similar damage in the future. The methodology includes hydrological and hydraulic analysis, geotechnical evaluation, and assessment of gabion effectiveness as an alternative protective structure. Results indicate that a 100-year return period flood generates a peak discharge of approximately 1058 m³/s, which poses a high risk of scouring along the riverbanks. A Type-C gabion structure with dimensions of 4 × 1 × 1 m was designed for a total length of 100 m (50 m upstream and 50 m downstream) to protect the abutment. Stability analysis confirmed the structure's ability to withstand water and soil pressures with adequate safety factors. The estimated construction cost is Rp 346,190,130. This study recommends gabions as an effective solution for the rehabilitation of Jenelata Bridge to ensure sustainable transport connectivity in flood-prone areas.

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