Analisa Transportasi Sedimen Bed Load Dan Suspended Load Pada Gelombang Miring

Permaisuri, Wilanda (2014) Analisa Transportasi Sedimen Bed Load Dan Suspended Load Pada Gelombang Miring. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ketidaksimetrisan pada gelombang menghasilkan perubahan tegangan geser yang lebih tinggi, akibatnya laju perpindahan sedimen juga akan semakin besar. Suntoyo et al. (2008) dalam jurnalnya telah mengamati efek ketidaksimetrisan gelombang terhadap tegangan geser dasar dan laju perpindahan sedimen pada transportasi sedimen bed load, namun belum dijabarkan secara jelas bagaimana pengaruhnya terhadap transportasi sedimen yang tersuspensi (suspended load), sehingga judul ini diangkat dengan mempertajam analisa efek ketidaklinieran pada gelombang terhadap transportasi sedimen, khususnya pada suspended load. Dari analisis yang dilakukan, dihasilkan kesimpulan bahwa semakin α kecil, semakin tinggi pula nilai tegangan geser dasarnya. Hal tersebut terjadi karena ada beda fase yang akibat percepatan, sehingga gelombang semakin condong seiring dengan tegangan geser dasar yang semakin besar. Pada net transportasi sedimen bed load, semakin condong gelombang (nilai α semakin kecil), semakin tinggi pula nilai net transportasi sedimen bedloadnya. Nilai suspended load lebih besar dari bed load. Net transportasi sedimen bed load dan net transportasi sedimen suspended load berbeda arah. Bed load lebih mengarah ke onshore, dan suspended load lebih mengarah ke offshore. Semakin condong/miring gelombang, maka transportasi sedimen suspended load semakin menuju ke arah onshore. Sedimen transport pada skew wave mengarah ke offshore karena ada beda fase, dan menuju onshore bila keasimetrisan bertambah besar. ======================================================================================================== The asymmetry in the waves make shear stress become higher, so sediment transport rate will also increase. Suntoyo et al. (2008) has observed in his journal wave asymmetry effects on the shear stress and the rate of sediment transport on bed load sediment transport, but it doesn’t clearly show how its effects for suspended sediment transport (suspended load), so the title was lifted for better analysis of the effects of nonlinearities on waves on sediment transport, especially in the suspended load. From the early analysis, resulting conclusion that the smaller α, make a higher the shear stress. This happens because there is a phase difference due to acceleration, so that the wave skew as shear stress increases. On the net bed load sediment transport, the more wave skewed (the smaller α), net bed load sediment transport become higher. The suspended load is higher than bed load. Net sediment transport bed load and suspended sediment transport net load a different direction. Bed load leads to onshore, and suspended load leads to more offshore. Increasingly waves skewed, then the load of suspended sediment transport towards onshore. Sediment transport in wave skew leads to offshore because there are different phases, and to the onshore when asymmetries increase.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 551.303 Per a
Uncontrolled Keywords: bed load, skew wave, suspended load, transportasi sedimen
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: 12 Feb 2018 04:54
Last Modified: 12 Feb 2018 04:54
URI: http://repository.its.ac.id/id/eprint/51226

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