Studi Penanganan Sedimentasi Muara Sungai Tukad Panarukan Di Antara Pantai Kerobokan Dan Pantai Panarukan Menggunakan Software Delft3D

Mufatakhurrohmah, Syela (2024) Studi Penanganan Sedimentasi Muara Sungai Tukad Panarukan Di Antara Pantai Kerobokan Dan Pantai Panarukan Menggunakan Software Delft3D. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia menghadapi abrasi dan sedimentasi pesisir, terutama di Kabupaten Buleleng, Bali, dengan garis pantai 158.89 km. Pantai Panarukan dan Kerobokan mengalami abrasi dan pendangkalan muara sungai, yang mengancam kawasan padat penduduk dan sektor penting lainnya. Meski sudah ada revetment sepanjang 250 meter di Pantai Panarukan dan 128 meter di Pantai Kerobokan, masalah sedimentasi di muara masih perlu solusi mendalam. Analisis dampak struktur pengaman pantai terhadap morfologi muara sangat penting, dan pembangunan jetty menjadi relevan untuk menjaga keberlanjutan lingkungan pesisir serta kesejahteraan masyarakat. Penelitian ini fokus pada pendangkalan akibat sedimen di muara Tukad Panarukan. Dengan melakukan berbagai analisa pada data angin, gelombang, pasang surut, dan topo grafi dasar laut untuk merencanakan jetty guna mengatasi sedimentasi. Elevasi jetty ditentukan oleh Wind setup, dan stabilitas struktur dihitung sebelum pemodelan sedimen dengan Delft3D. Hasil analisis menunjukkan kecepatan angin maksimum 10.39 m/s dengan arah dominan timur laut, tinggi gelombang 1.14 meter dengan periode 5.63 detik, dan gelombang pecah pada kedalaman 1.4 meter. Data pasang surut diolah untuk menentukan elevasi muka air laut dan didapatkan HHWL 1.07 meter dan LLWL -1.07 meter. Elevasi Wave setup diperoleh 1.26 meter dan Wind setup 1.70 meter. Dua desain jetty direncanakan dengan stabilitas 1.59 dan 1.62. Dalam kondisi gempa diatas faktor keamanan sebesar 1.56 dan 160. Analisis gradasi butiran sedimen dari tujuh lokasi menunjukkan variasi d50 rata rata 1.05 milimeter, dan debit baseflow dihitung sebesar 8.19 m³/detik. Simulasi menggunakan Delft3D menunjukkan bahwa tambahan jetty diperlukan untuk mengatasi sedimentasi di muara. Hasil simulasi menunjukkan bahwa keberadaan jetty dapat secara signifikan mengurangi akumulasi sedimen di area muara sungai dalam sebulan sebesar 2057.72 m3 . Jetty yang direncanakan memiliki dimensi yang sesuai untuk mengatasi permasalahan sedimentasi, dengan perhitungan yang mempertimbangkan stabilitas dan kondisi lingkungan. Penggunaan jetty diharapkan dapat meningkatkan efisiensi aliran sungai dan mencegah pendangkalan muara, memberikan manfaat jangka panjang bagi lingkungan dan aktivitas masyarakat di sekitar muara sungai. Dengan demikian, perencanaan dan implementasi struktur jetty merupakan solusi efektif dan berkelanjutan dalam mengatasi permasalahan sedimentasi di muara Sungai Tukad Panarukan.
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Indonesia faces coastal abrasion and sedimentation, particularly in Buleleng Regency, Bali, with a coastline of 158.89 km. Panarukan and Kerobokan beaches experience abrasion and river estuary sedimentation, which threaten densely populated areas and other critical sectors. Despite the presence of a 250-meter revetment at Panarukan Beach and a 128-meter revetment at Kerobokan Beach, sedimentation issues in the estuary still require comprehensive solutions. Analyzing the impact of coastal protection structures on estuary morphology is crucial, and the construction of jetties becomes relevant to ensure the sustainability of the coastal environment and the well-being of the community. This study focuses on sedimentation-induced shallowing at the Tukad Panarukan estuary. Various analyses of wind, wave, tidal, and seabed topography data are conducted to plan a jetty to address sedimentation issues. The jetty's elevation is determined by wind setup, and the structure's stability is calculated before sediment modeling with Delft3D. The analysis results indicate a maximum wind speed of 10.39 m/s with a predominant northeast direction, a wave height of 1.14 meters with a period of 5.63 seconds, and wave breaking at a depth of 1.4 meters. Tidal data processing determined the sea level elevations, resulting in an HHWL of 1.07 meters and an LLWL of -1.07 meters. The wave setup elevation was found to be 1.26 meters, and the wind setup elevation was 1.70 meters. Two jetty designs were planned with stability factors of 1.59 and 1.62. Under seismic conditions, the safety factors were 1.56 and 1.60. Sediment grain size analysis from seven locations showed an average d50 variation of 1.05 millimeters, and the baseflow discharge was calculated to be 8.189 m³/s. Simulations using Delft3D indicated that additional jetties are necessary to address sedimentation at the estuary. The simulation results demonstrated that the presence of jetties could significantly reduce sediment accumulation in the estuary area by 2057.72 m³ within a month. The planned jetties have dimensions suitable for addressing sedimentation issues, with calculations considering stability and environmental conditions. The use of jetties is expected to improve river flow efficiency and prevent estuary shallowing, providing long-term benefits for the environment and community activities around the river estuary. Thus, the planning and implementation of jetty structures represent an effective and sustainable solution for addressing sedimentation problems at the Tukad Panarukan River estuary.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Sedimentation, river mouth, Sedimentasi, muara sungai, jetty, Delft3D
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport T Technology > TC Hydraulic engineering. Ocean engineering > TC335 Sea-walls--Design and construction
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Syela Mufatakhurrohmah
Date Deposited:	16 Aug 2024 06:35
Last Modified:	16 Aug 2024 06:35
URI:	http://repository.its.ac.id/id/eprint/112897

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