Studi Eksperimen Bed Load Sediment Transport Akibat Variasi Tinggi Dan Periode Gelombang Pada Gelombang Irregular

Fattah, A. Haris (2015) Studi Eksperimen Bed Load Sediment Transport Akibat Variasi Tinggi Dan Periode Gelombang Pada Gelombang Irregular. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Studi mengenai sediment transport dalam berbagai kondisi telah banyak dilakukan baik dalam bentuk eksperimen laboratorium maupun pemodelan numerik. Penelitian ini berisikan laporan hasil eksperimen transportasi sedimen bed load menggunakan gelombang irregular. Studi eksperimen ini bertujuan untuk mengetahui pengaruh variasi tinggi dan periode gelombang terhadap perilaku transportasi sedimen pada kondisi gelombang irregular serta mengetahui metode yang lebih tepat. Perhitungan dimulai dengan mentransformasikan nilai elevasi muka air hasil eksperimen di laboratorium ke dalam nilai orbital velocity kemudian dilanjutkan dengan perhitungan tegangan geser dasar (bottom shear stress) dan bed load sediment transport. Eksperimen ini dilakukan di wave flume tank laboratorium lingkungan dan energi lautan Jurusan Teknik Kelautan ITS menggunakan spektrum gelombang JONSWAP dengan variasi tinggi, periode, dan kedalaman pada saat pembangkitan. Terdapat 2 metode yang digunakan untuk menghitng teganga geser dasar, yakni metode Neilsen (2002) dan metode Tanaka dan Samad (2006). Sedangkan untuk perhitungan bed load menggunakan metode Suntoyo dan Tanaka (2009). Dari hasil eksperimen dan perhitungan dapat disimpulkan bahwa variasi tinggi dan periode gelombang mempengaruhi perilaku net bed load sediment transport. Adapun formula dari dua metode yang lebih mendekati adalah metode Nielsen (2002) dengan nilai determinasi R2 = 0.5151. =================================================================================================== Experimental study of sediment transport had been done in various conditions both in the laboratory study or numerical model. This research report contains the results of sediment transport experiments were carried out under irregular wave condition. The goal of this experimental study is to find out bed load sediment transport due to wave high and period varian under irregular wave and to determine the better method. Calculations start from transforming the water surface elevation into the orbital velocity then to the bottom shear stress calculation and bed load sediment transport. Experiments conducted in wave flume tank, marine environment and energy laboratory, Ocean Engineering ITS, using JONSWAP wave spectrum with some variation of wave height, period and depth. There are two methods used in this research those Neilsen (2002) and Tanaka and Samad (2006) for calculating the bottom shear stress and using Suntoyo and Tanaka (2009) method for bed load calculation. From the results of experiments and calculations it can be concluded that the closest formula of bedload sediment transport to the experimental results is shear stress method by Neilsen (2002) with determination value, R2 = 0.5151.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 551.303 Fat s
Uncontrolled Keywords: gelombang irregular, variasi tinggi dan periode gelombang, bedload sedimen transport.
Subjects: Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport.
Divisions: Faculty of Marine Technology > Ocean Engineering > (S1) Undergraduate Theses
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 15 May 2018 02:17
Last Modified: 15 May 2018 02:17
URI: http://repository.its.ac.id/id/eprint/51870

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