Model Arus dan Sedimen di Sekitar Muara Sungai Bogowonto menggunakan Delft3D Flow and Sediment Modelling Around Bogowonto Estuary Using Delft3D

Ghalizhan, Ahmad Faramarz (2025) Model Arus dan Sedimen di Sekitar Muara Sungai Bogowonto menggunakan Delft3D Flow and Sediment Modelling Around Bogowonto Estuary Using Delft3D. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bandara Internasional Yogyakarta (YIA) merupakan salah satu bangunan vital di kawasan selatan DIY. Bandara tersebut diapit oleh dua buah sungai, yaitu Sungai Serang dan Sungai Bogowonto. Sungai-sungai di wilayah selatan DIY sebagian besar karakteristiknya adalah berbelok ke arah Barat dan tertutup saat musim kemarau. Tertutupnya muara sungai tersebut dapat menyebabkan terjadinya banjir dan membahayakan keberadaan bandara tersebut. Pada bulan Mei 2023 double-jetty di Muara Bogowonto diresmikan dengan tujuan agar mulut muara stabil dan tidak berbelok ke arah barat. Delft3D-Flow untuk mensimulasikan aliran arus di pantai dan Delft3D-Wave untuk mensimulasikan gelombang akan digunakan dalam penelitian ini. Analisis pola interaksi arus dan gelombang di sekitar jetty muara Sungai Bogowonto dikaji berdasarkan hasil simulasi hidrodinamika menggunakan Delft3D untuk memprediksi dampak perubahan lingkungan akibat jetty. Hasil simulasi di analisis untuk mengevaluasi distribusi pola arus dan laju sedimen dalam 3 skenario: kondisi muara tanpa jetty, ujung jetty di kedalaman -7 m, dan ujung jetty di kedalaman -10 m. Hasil analisis menunjukkan rata-rata laju sedimentasi pada skenario kedalaman -10m sebesar 0.06 m/tahun dengan nilai arus saat Spring di Titik A maksimal sebesar 0.194 m/s dengan arus rata-rata sebesar 0.187 m/s, saat Neap di Titik A arus maksimal sebesar 0.205 m/s dengan arus rata-rata sebesar 0.199 m/s. Sedangkan saat Spring di Titik B memiliki arus maksimal sebesar 0.037 m/s dan rata-rata sebesar 0.027 m/s, saat Neap di Titik B arus maksimal sebesar 0.024 m/s dan rata-rata sebesar 0.02 m/s. Jetty dengan ujung kedalaman -10m lebih tidak menimbulkan erosi dan penumpukan sedimentasi dibuktikan dari sisi kecepatan arus dan laju sedimentasi. Berdasarkan faktor lain, biaya salah satunya, ujung kedalaman jetty di -7m menjadi solusi yang cukup aman untuk dipilih karena ujung jetty lebih pendek.
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Yogyakarta International Airport (YIA) is a vital facility in the southern region of Yogyakarta Special Region (DIY). The airport is flanked by two rivers, the Serang River and the Bogowonto River. Most rivers in the southern region of Yogyakarta typically bend westward and close during the dry season. Closing the river mouths can cause flooding and endanger the airport. In May 2023, a double jetty at Muara Bogowonto was inaugurated to stabilize the estuary and prevent it from turning westward. Delft3D-Flow, a coastal current simulation tool, and Delft3D-Wave, a wave simulation tool, will be used in this study. The analysis of current and wave interaction patterns around the Bogowonto River estuary jetty is based on hydrodynamic simulation results using Delft3D to predict the impact of environmental changes caused by the jetty. The simulation results are analyzed to evaluate the distribution of current patterns and sediment rates in three scenarios: an estuary without a jetty, a jetty tip at a depth of -7 m, and a jetty tip at a depth of -10 m. The analysis results show that the average sedimentation rate in the -10m depth scenario is 0.06 m/year with a maximum current value during Spring at Point A of 0.194 m/s with an average current of 0.187 m/s, during Neap at Point A the maximum current is 0.205 m/s with an average current of 0.199 m/s. While during Spring at Point B it has a maximum current of 0.037 m/s and an average of 0.027 m/s, during Neap at Point B the maximum current is 0.024 m/s and an average of 0.02 m/s. Jetty with a depth of more than -10m does not cause erosion and sedimentation accumulation as evidenced by the current speed and sedimentation rate. Based on other factors, one of which is cost, the end of the jetty depth at -7m is a fairly safe solution to choose because the tip of the jetty is shorter in length.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Delft3D-Flow, Double-jetty, Muara Sungai, Delft3D-Flow, Double-jetty, River Estuaries
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport T Technology > TC Hydraulic engineering. Ocean engineering > TC203.5 Coastal engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC333 Breakwaters
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Ahmad Faramarz Ghalizhan
Date Deposited:	29 Jul 2025 10:38
Last Modified:	29 Jul 2025 10:38
URI:	http://repository.its.ac.id/id/eprint/122625

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