Luthfi, Ahmad Qaedi (2025) Studi Eksperimen Perubahan Morfologi Pantai Di Sekitar Geotextile Tube (Geotube) Pada Beach Nourishment Dengan Variasi Muka Air Laut. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Erosi pantai merupakan ancaman serius bagi wilayah pesisir yang berdampak pada kerusakan lingkungan dan kerugian sosial-ekonomi. Salah satu metode soft engineering yang banyak digunakan adalah beach nourishment, yaitu pengisian ulang sedimen pantai, namun material pasir hasil nourishment cenderung tidak stabil dan mudah terangkut oleh gelombang sehingga memerlukan perlindungan tambahan. Geotextile Tube (Geotube) menjadi salah satu solusi yang digunakan untuk menahan pasir serta meredam energi gelombang. Namun demikian, efektivitasnya sangat dipengaruhi oleh fluktuasi muka air laut akibat pasang surut yang mengubah tekanan hidrodinamis dan morfologi. Penelitian ini mengkaji perubahan morfologi di sekitar Geotube pada tiga kondisi elevasi muka air dengan variasi tinggi gelombang irregular (Hs = 6, 8, 10, 12, dan 16 cm) dan periode gelombang (T = 1.0, 1.3, 1.5, 1.68, dan 1.84 detik) dan diameter butir sedimen d50 = 0.215 mm. pada skala Froude 1:30. Model uji menggunakan Geotube berbahan geotekstil polipropilena dengan dimensi 81 cm panjang, 15 cm lebar, 10 cm tinggi, dan berat unit 12 kg. Hasil pengujian menunjukkan bahwa pada kondisi LWS, terjadi transport sedimen ke arah depan Geotube hingga menimbun kaki Geotube. Pada kondisi MSL, fenomena utama adalah redistribusi sedimen dengan limpasan tipis. Dan pada kondisi ekstrem HWS, terjadi overtopping mendekati 100% dan run-up terjauh 90 cm, sehingga menghasilkan scouring signifikan yang semakin dalam seiring kenaikan tinggi gelombang. Kedalaman maksimum scouring 4.7 cm dan lebar maksimum 20.8 cm untuk variasi H12 kondisi HWS. Geotube dan Scourtube terbukti stabil tanpa adanya pergeseran, deformasi, atau kerusakan material geotekstil dengan tingkat retensi material sangat baik hingga 96%. Konfigurasi Geotube, Scourtube dan sand nourishment terbukti efektif mempertahankan pasir.
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Coastal erosion is a serious threat to shoreline environments, causing ecological degradation and socio-economic losses. Beach nourishment is widely applied as a soft-engineering approach to restore eroded beaches, however, nourished sand is often unstable and easily transported by waves, thus requiring additional protection. Geotextile tubes (Geotubes) are therefore used to retain nourished sediment and dissipate wave energy. Their performance, however, is strongly influenced by tidal water-level fluctuations, which alter hydrodynamic loading and nearshore morphology. This study investigates morphological changes around a Geotube under three water-level conditions and irregular wave forcing with significant wave heights of 6, 8, 10, 12, and 16 cm and wave periods of 1.0, 1.3, 1.5, 1.68, and 1.84 s. The sediment grain size was d50 = 0.215 mm, and followed Froude similarity at a 1:30 scale. The physical model employed a polypropylene geotextile Geotube with dimensions of 81 cm (length), 15 cm (width), and 10 cm (height), with a unit mass of 12 kg. The results show that under LWS, sediment was transported toward the seaward face, leading to burial at the toe. Under MSL, the dominant response was sediment redistribution driven by thin overtopping sheets. Under HWS, overtopping approached 100% and the maximum run-up distance 90 cm, producing significant landward scour that increased with wave height. The maximum scour depth and width were 4.7 cm and 20.8 cm, respectively, for the H12–HWS case. The Geotube and Scourtube remained stable throughout the tests, with no observable displacement, deformation, or geotextile damage, and exhibited high material retention of up to 96%. Overall, the combined Geotube–Scourtube–beach nourishment effectively maintained nourishment performance.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Beach Nourishment, Elevasi Muka Air, Geotextile Tube, Morfologi Pantai ===================== Beach Nourishment, Geotextile Tube, Morphological Change, Sea Water Level |
| Subjects: | 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 T Technology > TC Hydraulic engineering. Ocean engineering > TC424 Water levels |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Ahmad Qaedi Luthfi |
| Date Deposited: | 13 Jan 2026 06:04 |
| Last Modified: | 13 Jan 2026 06:04 |
| URI: | http://repository.its.ac.id/id/eprint/129556 |
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