Pemodelan Hidrodinamika Pola Arus dan Sedimentasi untuk Mendukung Alur Pelayaran di Muara Sungai Barito Kalimantan Selatan

Utomo, Andik Cahyo (2024) Pemodelan Hidrodinamika Pola Arus dan Sedimentasi untuk Mendukung Alur Pelayaran di Muara Sungai Barito Kalimantan Selatan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Muara Sungai Barito di Kalimantan Selatan memegang peranan krusial dalam transportasi maritim Indonesia. Sebagai sungai terbesar di Kalimantan dengan muara yang menghadap Laut Jawa, Muara Sungai Barito mendukung berbagai sektor ekonomi, terutama perdagangan dan alur bongkar muat batu bara yang dikelola oleh PT Ambang Barito Nusapersada (Ambapers). Alur pelayaran yang efisien menjadi kunci untuk memastikan kelancaran distribusi barang dan pertumbuhan ekonomi regional. Namun, pendangkalan alur akibat sedimentasi menjadi kendala serius, dipengaruhi oleh perubahan perilaku alam di hulu, badan sungai, dan muara. Ukuran butiran sedimen dan kecepatan arus menjadi faktor penentu pergerakan sedimen. Studi ini mengajukan pemodelan hidrodinamika pola arus dan sedimentasi untuk mendalaminya, dengan menggunakan Software Deflt3D. Model hidrodinamika menunjukkan variasi kecepatan dan arah arus yang signifikan antara periode pasang dan surut, serta antara musim basah dan timur. Arus yang lebih kuat selama musim basah mengarah dari hulu ke hilir dengan kecepatan yang lebih tinggi dibandingkan dengan musim kering. Arus rata-rata model adalah 0,1 m/s. Kemudian meninjau hasil validasi dengan nilai r=0,91, RMSE=0,182, MAPE= 1,527 % maka model dianggap mampu memvisualisasikan kejadian hidrodinamika dengan baik. Model sedimentasi menunjukkan konsentrasi sedimen yang lebih tinggi di muara selama musim kering. Pada musim basah, sedimentasi lebih merata dan tidak terkonsentrasi pada satu area tertentu karena arus yang lebih kuat mendistribusikan sedimen lebih luas. Pada simulasi musim kering sedimentasi yang dapat terjadi berkisar 0,100 m dalam 6 bulan atau berkisar 0,017 m/bulan. Sedangkan pada musim basah sedimentasi yang dapat terjadi berkisar 0,060 m dalam 6 bulan atau berkisar 0,010 m/bulan. Dampak pola sebaran arus dan sedimentasi terhadap alur pelayaran selama musim kering peningkatan sedimentasi dapat mempersempit dan mendangkalkan alur pelayaran, mengurangi kedalaman yang dapat dilewati kapal besar dan meningkatkan risiko kapal kandas. Selama musim basah, meskipun arus lebih kuat, distribusi sedimen yang lebih merata mengurangi risiko penumpukan di satu lokasi tertentu khususnya area bagan sungai
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The Barito River Estuary in South Kalimantan plays a crucial role in Indonesia's maritime transportation. As the largest river in Kalimantan with an estuary facing the Java Sea, the Barito River Estuary supports various economic sectors, especially trade and coal loading and unloading channels which are managed by PT Ambang Barito Nusapersada (Ambapers). Efficient shipping channels are the key to ensuring the smooth distribution of goods and regional economic growth. However, shallowing of the channel due to sedimentation is a serious obstacle, influenced by changes in natural behavior in the upstream, river bodies and estuaries. The size of sediment grains and current speed are determining factors in sediment movement. This study proposes hydrodynamic modeling of current and sedimentation patterns to explore this, using Deflt3D software. The hydrodynamic model shows significant variations in current speed and direction between high and low tide periods, as well as between the wet and easterly seasons. Stronger currents during the wet season lead from upstream to downstream at higher speeds compared to the dry season. The average flow of the model is 0.1 m/s. Then reviewing the validation results with a value of r=0.91, RMSE=0.182, MAPE= 1.527%, the model is considered capable of visualizing hydrodynamic events well. Sedimentation models show higher sediment concentrations in estuaries during the dry season. In the wet season, sedimentation is more even and not concentrated in one particular area because stronger currents distribute sediment more widely. In the dry season simulation, sedimentation that can occur is around 0.100 m in 6 months or around 0.017 m/month. Meanwhile, in the wet season, sedimentation that can occur is around 0.060 m in 6 months or around 0.010 m/month. The impact of current distribution patterns and sedimentation on shipping lanes during the dry season, increased sedimentation can narrow and shallow shipping lanes, reduce the depth at which large vessels can pass and increase the risk of ships running aground. During the wet season, even though currents are stronger, a more even distribution of sediment reduces the risk of accumulation in one particular location, especially areas of the river chart.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Current Patterns, Deflt3D-FLOW, Hydrodynamic Modelling, Navigation Channel, Sedimentation, Alur Pelayaran, Deflt3D-FLOW, Pemodelan Hidrodinamika, Pola Arus, Sedimentasi
Subjects:	Q Science > QA Mathematics > QA911 Fluid dynamics. Hydrodynamics Q Science > QC Physics > QC151 Fluid dynamics Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport. Erosion.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Andik Cahyo Utomo
Date Deposited:	13 Aug 2024 06:20
Last Modified:	13 Aug 2024 06:20
URI:	http://repository.its.ac.id/id/eprint/115373

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