Analisa Perubahan Morfologi Muara Sungai Porong Akibat Sedimentasi Lumpur Sidoarjo Jawa Timur

Liyani, Liyani (2013) Analisa Perubahan Morfologi Muara Sungai Porong Akibat Sedimentasi Lumpur Sidoarjo Jawa Timur. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bencana ekologis nasional semburan lumpur panas telah terjadi di daerah Sidoarjo Indonesia (dikenal dengan Lusi, Lumpur Sidoarjo) pada tanggal 29 Mei 2006. Prakiraan volume semburan Lusi antara 50.000 — 120.000 m3/hari. Muara adalah bagian hilir sungai yang langsung berhubungan dengan laut, berfungsi sebagai pengeluaran air sungai. Sedimen yang terakumulasi dari sungai tersebut akan menyebabkan pendangkalan di daerah muara. Muara Porong yang terletak di Kecamatan Jabon, Kabupaten Sidoarjo, Jawa Timur merupakan muara dari Sungai Porong yang berasal dari percabangan sungai. Akibat pembuangan Lusi ke Sungai Porong terjadi transpor sedimen yang besar menuju muara Porong. Pada studi ini digunakan model numerik hidrodinamika menggunakan MIKE 21 yang dikembangkan oleh DHI Water & Environment untuk mensimulasikan pola sirkulasi arus. Simulasi dilakukan dengan skenario pasut, discharge sungai dan angin sebagai pembangkit. Hasil simulasi menunjukkan bahwa dalam rentang waktu simulasi, kecepatan rata-rata sirkulasi arus sebesar 0.3 m/s. Sementara pola sebaran sedimen hasil simulasi menunjukkan sedimen yang dibawa sungai ke muara cukup besar. Konsentrasi sedimen maksimum sebesar 4.257 g/m’ dan konsentrasi sedimen terendah sebesar 0.219 g/m’. Perubahan morfologi dasar muara (bed level change) tidak begitu signifikan dikarenakan dalamnya perairan dan konsentrasi sedimen yang terlarut sangat rendah.
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Mudflow national ecological disaster has occurred in Sidoarjo Indonesia (known as Lusi, Lumpur Sidoarjo) on May 29, 2006. Estimate volume of Lusi between 50.000-120.000 m3/day. Estuary is the mouth of the river that directly related to the sea, which has function as a water expenditure. Accumulated sediment from the river will cause siltation in the estuary. Porong estuary located in Jabon district, Sidoarjo regency, East Java, is the estuary of the River Porong derived from branching river. Due to disposal of Lusi to Porong river, occurred large sediment transport toward Porong estuary. In this study, numerical hydrodynamic models is used, using MIKE 21 software developed by DHI Water & Environment to simulate current circulation patterns. Simulations is executed with tidal, river discharge and wind as a generator. The result of simulation shows that in the span of the simulation, the average speed of the current circulation is 0.3 m/s. While the distribution pattern of sediment simulation’s results shows that sediment brought from river toward estuary is quite large. The maximum sediment concentration is 4.257 g/m? and the lowest sediment concentration is 0.219 g/m’. The bed level change of estuary is not so significant because of the depth of water and the concentration of sediment dissolved is very low.

Item Type:	Thesis (Masters)
Additional Information:	RTPe 551.303 Liy a 2013 3100013051227 (WEEDING)
Uncontrolled Keywords:	Estuary, Lumpur Sidoarjo, MIKE 21, Sedimentation
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis
Depositing User:	Anis Wulandari
Date Deposited:	26 Feb 2026 07:58
Last Modified:	26 Feb 2026 07:58
URI:	http://repository.its.ac.id/id/eprint/132643

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