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All Journal Jurnal Mahasiswa Jurusan Teknik Pengairan Jurnal Teknik Pengairan: Journal of Water Resources Engineering
Andriantari, Nur Fadhlillah
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Engineering

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STUDI PERENCANAAN BANGUNAN GROUNDSILL DAN REVETMENT SUNGAI PENGAMAN JEMBATAN BANDUNG DI PARIT RAYA KABUPATEN TULUNGAGUNG Andriantari, Nur Fadhlillah; Suprijanto, Heri
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 2, No 2 (2019)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Abstract

ABSTRAK: Parit Raya merupakan salah satu sungai buatan yang terletak di Kabupaten Trenggalek dan Kabupaten Tulungagung, bagian hulunya terletak di Desa Bendorejo, Kecamatan Pogalan, Kabupaten Trenggalek, sedangkan hilirnya berada di Desa Besuki, Kecamatan Besuki, Kabupaten Tulungagung. Disebelah hulu Parit Raya menyatu dengan Kali Ngasinan. Disepanjang Parit Raya muncul permasalahan berupa banyaknya tanggul/tebing yang kritis, bangunan air yang hancur dan longsor yang dapat mengancam pemukiman warga serta banyak juga abutment dari jembatan yang mengalami degradasi akibat luapan Parit Raya pada daerah hulu, sehingga jembatan-jembatan tersebut tidak dapat difungsikan kembali. Analisa debit banjir rancangan kala ulang 25 tahun menggunakan metode Hidrograf Satuan Sintetis Nakayasu didapatkan debit sebesar 569.762 m3/dt. Bangunan groundsill akan direncanakan dengan jarak ±10 m dari jembatan. Sedangkan untuk analisa banjir akan di running menggunakan aplikasi HEC-RAS 5.0.3.  Detail dimensi bangunan groundsill yaitu tinggi main dam 1,5 m, lebar pelimpah 50 m, tebal mercu main dam 2 m, kedalaman pondasi 1,2 m, tinggi sub dam 0,80 m dan tebal mercu sub dam 2 m. Untuk revetment dengan tinggi bangunan 6,5 m dan kedalaman pondasi bangunan 1m. Dengan daya dukung izin tanah yang tidak memenuhi syarat maka dibantu dengan adanya tiang pancang dengan panjang 7,8 meter untuk groundsill dan 8 m untuk revetment. Kata kunci : Groundsill, Revetment, Parit Raya, HEC-RAS     ABSTRACT: Parit Raya is one of the artificial rivers located in Trenggalek Regency and Tulungagung Regency. The upstream is located in Bendorejo Village, Pogalan District, Trenggalek Regency, while the downstream is in Besuki Village, Besuki District, Tulungagung District.In the upstream, Parit Raya merges with Ngasinan River. Along Parit Raya appears some problems such as critical levee, broken water buildings, dangerous landslides that can threaten residents settlements and degraded abutments from bridges due to the overflow of Parit Raya in the upstream area, so that the bridges cannot be used. The designed flood discharge analysis of 25-year return period with the Nakayasu Synthetic Unit Hydrograph method is 569.762 m3/dt, Futhermore, the groundsill will be planned in distance of ± 10 m from the bridge. Besides that, the flood analysis will use HEC-RAS 5.0.3 application. Moreover, the detailed dimensions of the groundsill are stated as follow: the height of the main dam is 1,5 m, the width of the main dam is 50 m, the thickness of the main dam is 2 m, the depth of the foundation is 1,2 m, the height of the sub dam is 0,80 m and the thickness of the sub dam is 2 m. For revetment, the height is 6,5 and the dept of the building fondation is 1 meter. With the soil allowance bearing capacity that doesn’t meet the requirements, it is assisted by the presence of a 7.8 meter long pile for groundsill and 8 m for the revetment. Keywords : Groundsill, Revetment, Parit Raya, HEC-RAS
The Effect of Groundsills on the Degradation and Aggradation Processes of the Parit Raya Riverbed Andriantari, Nur Fadhlillah; Andawayanti, Ussy; Hendrawan, Andre Primantyo; Putra, Farhan Akbar Darma
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 16 No. 2 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2025.016.02.8

Abstract

Parit Raya is part of the drainage system of the Ngasinan River in Trenggalek and Tulungagung regencies. It is designed to reduce flooding and manage waterlogging caused by the construction. However, in the rainy season, the high flow velocity often causes damage to groundsills, triggering riverbed degradation or aggradation. This study aims to analyze the degradation and aggradation phenomena in Parit Raya River and the effect of two groundsill to reduce these actions using Hydrologic Engineering Center’s River Analysis System (HEC-RAS) simulations. The flow and sediment dynamics analysis uses Meyer Peter Müller (MPM), Engelund Hansen, and Laursen Copeland methods. The research locations focus on three river sections, consisting of 74 cross-sections, with two groundsills. By using the MPM, Englund-Hansen, and Laursen-Copeland methods modeled in HEC-RAS 6.0.0 software, this study can help in evaluating the effectiveness of groundsills in controlling sediment, preventing excessive erosion, and maintaining the stability of other hydraulic structures in rivers. The analysis reveals that conditions upstream of the groundsill tend to experience aggradation due to sediment deposition in STA 120, STA 103.60, and STA. 79.40, downstream conditions are characterized by degradation, indicated by riverbed erosion resulting from increased flow velocity between STA 120 and STA 47. Among the methods applied, the MPM and Engelund-Hansen methods provided results that closely align with field conditions compared to the Laursen-Copeland method.
Co-Authors Andre Primantyo Hendrawan Heri Suprijanto Putra, Farhan Akbar Darma Ussy Andawayanti