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All Journal Journal of Marine-Earth Science and Technology Jurnal Impresi Indonesia
Syamsuddin, Mohammad Dimas Noor
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Religion Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Law, Crime, Criminology & Criminal Justice Social Sciences

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Analisis Penurunan Tinggi Muka Air Sungai Rejoso di Kabupaten Pasuruan dengan Normalisasi Sungai Syamsuddin, Mohammad Dimas Noor; Maulana, Mahendra Andiek
Jurnal Impresi Indonesia Vol. 4 No. 7 (2025): Indonesian Impression Journal (JII)
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v4i7.6880

Abstract

Sungai Rejoso di Kabupaten Pasuruan mengalami permasalahan banjir yang disebabkan oleh kapasitas penampang yang tidak mampu menampung debit banjir rencana. Penelitian ini bertujuan untuk menganalisis kondisi hidrologi DAS Rejoso, mengevaluasi kapasitas eksisting sungai, dan mengkaji efektivitas normalisasi sungai dalam mengurangi tinggi muka air banjir. Metode penelitian menggunakan analisis hidrologi dengan data curah hujan 10 stasiun selama periode 2014-2023, pemodelan debit banjir menggunakan HEC-HMS, dan analisis hidraulik menggunakan HEC-RAS. DAS Rejoso memiliki luas ± 361,2 km² yang meliputi 10 kecamatan. Analisis hidrologi menggunakan distribusi Log Pearson III menghasilkan debit banjir rancangan kala ulang 25 tahun sebesar 145,5 m³/dt. Hasil pemodelan HEC-RAS menunjukkan kondisi eksisting sungai tidak mampu menampung debit rancangan dengan tinggi genangan rata-rata 1,207 meter, 408 titik tanggul kanan meluap, dan 321 titik tanggul kiri meluap. Skenario normalisasi sungai berhasil mengurangi tinggi genangan menjadi 0,722 meter dengan 237 titik tanggul kanan meluap dan 148 titik tanggul kiri meluap, memberikan reduksi tinggi muka air sebesar 40,174% terhadap kondisi eksisting. Hasil penelitian ini memberikan implikasi penting bagi pemerintah daerah dalam merencanakan normalisasi sungai sebagai solusi teknis pengendalian banjir berbasis data. Temuan studi menunjukkan perlunya mengintegrasikan normalisasi dengan pembangunan tanggul dan kolam retensi di titik-titik rawan luapan untuk hasil yang lebih optimal. Selain itu, diperlukan program pemantauan dan pemeliharaan berkala untuk mencegah sedimentasi pasca-normalisasi guna memastikan keberlanjutan intervensi yang dilakukan. Normalisasi sungai terbukti efektif dalam mengendalikan banjir di Sungai Rejoso meskipun masih terdapat luapan pada beberapa ruas.
HYDRAULIC MODELING STUDY OF ALTERNATIVE FLOOD CONTROL STRATEGIES FOR THE REJOSO RIVER PASURUAN Syamsuddin, Mohammad Dimas Noor; Maulana, Mahendra Andiek
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Rejoso River is administratively included in Pasuruan Regency where its watershed is located in 10 sub-districts (Puspo, Tosari, Gondang Wetan, Rejoso, Winongan, Pasrepan, Grati Districts of Pasuruan Regency and Lumbang, Sukapura, Probolinggo Regency). The area of the Rejoso River watershed is ± 361.2 km2, bordered by hillsides and protected forests. In general, the cause of flooding in the Rejoso River watershed is caused by high intensity rainfall and changes in land use such as the Rejoso River, especially in the upstream area. The flat topography of the downstream area causes potential sedimentation which inhibits the flow (run off). The purpose of this study is to determine the condition of the existing system and capacity of the Rejoso River; to determine the influence of land use, and to provide alternative scenarios for the most effective flood control to reduce the flood water level or collect the flood that occurs. In this study, hydrological and hydraulic modeling was carried out. The method that used in the calculation of flood discharge is HEC-HMS, while for hydraulic analysis the HEC-RAS 1D is used with the results of water level at the river cross section. This analysis aims to determine the most effective flood control scenario for reducing flooding that occurs in the Rejoso River. The results of this study are alternative flood control scenarios for the Rejoso River by carrying out normalization, embankment’s structure and retention ponds which are the best scenarios for reducing high flood water levels. This can be shown by a decrease of average height of the flood water level from 1.207 meters to 0.435 meters. With these conditions, it can be concluded that this scenario is the best scenario for reducing the high flood overflow in the Rejoso River.
Co-Authors Maulana, Mahendra Andiek