Sari, Dina Nabila (2026) Analisis Perubahan Morfologi Pantai Karang Kempus hingga Pantai Delegan akibat Struktur Trestle dan Jetty Terminal LPG Refrigerated Pertamina Tuban. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Peningkatan kebutuhan distribusi energi nasional mendorong pembangunan infrastruktur maritim berupa terminal LPG dan dermaga jetty berkapasitas besar di Kabupaten Tuban, Jawa Timur. Pembangunan struktur trestle dan jetty yang menjorok ke laut berpotensi mengubah kondisi hidrodinamika alami di sekitarnya, termasuk arah arus dan distribusi energi gelombang, sehingga memicu perubahan pola transport sedimen. Penelitian ini bertujuan untuk menganalisis karakteristik hidrodinamika laut pada kondisi eksisting sebelum operasional jetty, mengevaluasi pola transport sedimen dan perubahan morfologi akibat interaksi struktur trestle–jetty dengan sistem hidrodinamika, serta mengkaji pengaruhnya terhadap kestabilan lingkungan pesisir selama periode simulasi 50 tahun. Penelitian menggunakan metode Least Square untuk analisis harmonik pasang surut, Root Mean Square Error untuk validasi hasil prediksi, hindcasting untuk pembangkitan data gelombang berdasarkan data angin, serta perhitungan delta persentase untuk validasi arus pantai hasil simulasi.
Hasil validasi menunjukkan model memiliki tingkat kesesuaian yang baik terhadap data observasi sehingga layak digunakan untuk simulasi hidrodinamika, transport sedimen, dan perubahan morfologi. Hasil penelitian menunjukkan Berdasarkan hasil analisis, rata-rata perubahan elevasi dasar laut per tahun pada titik B1 sebesar 0,08 m/tahun, B2 sebesar 0,005 m/tahun, T3 sebesar 0,002 m/tahun, dan T4 sebesar 1,75 m/tahun. Nilai tersebut menunjukkan bahwa perubahan morfologi dasar laut terbesar terjadi pada T4, sedangkan T3 mengalami perubahan paling kecil dan relatif stabil. Penelitian ini diharapkan memberikan rujukan bagi perencanaan infrastruktur maritim yang mempertimbangkan aspek hidrodinamika dan morfologi pesisir secara berkelanjutan.
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The growing demand for national energy distribution is driving the development of maritime infrastructure, including LPG terminals and large-capacity jetties in Tuban Regency, East Java. The construction of trestle structures and jetties extending out to sea has the potential to alter the natural hydrodynamic conditions in the surrounding area, including current direction and wave energy distribution, thereby triggering changes in sediment transport patterns. This study aims to analyze the hydrodynamic characteristics of the sea under existing conditions prior to the jetty’s operation, evaluate sediment transport patterns and morphological changes resulting from the interaction between the trestle–jetty structure and the hydrodynamic system, and examine their impact on coastal environmental stability over a 50-year simulation period. The study used the Least Squares method for tidal harmonic analysis, Root Mean Square Error for validating prediction results, hindcasting for generating wave data based on wind data, and percentage delta calculations for validating simulated coastal currents.
The validation results show that the model has a good level of fit with the observed data, making it suitable for simulating hydrodynamics, sediment transport, and morphological changes. The research results show based on the analysis, the average annual change in seafloor elevation at point B1 is 0.08 m/year, at B2 is 0.005 m/year, at T3 is 0.002 m/year, and at T4 is 1.75 m/year. These values indicate that the greatest change in seafloor morphology occurs at T4, while T3 experiences the smallest change and remains relatively stable. This study is expected to serve as a reference for maritime infrastructure planning that takes into account hydrodynamic and coastal morphological aspects in a sustainable manner.
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