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.
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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. Erosion.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
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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