Studi Modifikasi Jetty Sebagai Alternatif Penanganan Sedimentasi Di Kanal Water Intake PLTGU Grati

Atikasari, Titis Julaikha (2016) Studi Modifikasi Jetty Sebagai Alternatif Penanganan Sedimentasi Di Kanal Water Intake PLTGU Grati. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangkit Listrik Tenaga Gas dan Uap (PLTGU) Grati memiliki dua buah jetty sebagai kanal water intake yang berfungsi sebagai pintu masuk air laut yang dipompa dari Selat Madura menuju steam turbin pendingin mesin. Pengendapan material sedimen di sekitar kanal water intake mempengaruhi jumlah aliran air yang masuk menuju mesin pendingin, sehingga hampir setiap tahunnya diadakan pengerukan. Salah satu alternatif penanganan yang dapat dilakukan untuk mengurangi frekuensi pengerukan adalah dengan memodifikasi jetty kanal water intake agar laju sedimentasi menjadi berkurang. Penelitian ini membandingkan volume sedimentasi pada jetty kondisi eksisting dan tiga jetty alternatif yang terjadi akibat arus dan gelombang, dimana pemodelan dilakukan dengan menggunakan Mike 21. Hasil pemodelan jetty eksisting menunjukkan volume sedimentasi yang dilinierisasikan selama 12 bulan sebesar 88509.8199 m3, sedangkan volume sedimentasi dari jetty alternatif 1, 2, dan 3 yang dihasilkan selama 12 bulan secara berturut-turut adalah 24722.673 m3, 31230.261 m3, dan 25060.3624 m3. Modifikasi bentuk jetty yang diberikan mampu mengurangi laju sedimentasi di Kanal Water Intake PLTGU Grati, dengan pengurangan volume sedimentasi paling optimum selama 12 bulan sebesar 63787.1473 m3. ==================================================================================== Steam and Gas Power Plant (PLTGU) Grati has two jetties as the canal water intake that used as the entrance of sea water which pumped from Madura Strait towards the steam turbine-cooling engine. The deposition of the sedimentary material around the canal water intake influence the amount of water flow into the cooling engine, so almost every year the dredging is held around. One of the handling alternative that could be done to reduce the frequency of dredging is by modifying the jetty channel water intake, so that sedimentation rate could be reduced. This study compares sedimentation volume jetty that occur due to wave and current which modelled using Mike 21 of the existing jetty and three alternatives jetty. The result of existing jetty modelling indicates that linierization sedimentation volume which lineared for 12 months amounted to 88509.8199 m3, whereas the volume of sedimentation from the jetty alternatives 1, 2, and 3 are generated for 12 months in a row was 24722.673 m3, 31230.261 m3, and 25060.3624 m3. The modified jetties could reduve the rate of sedimentation in the Canal Water Intake PLTGU Grati, with the most optimum reduction of sedimentation volume during 12 months is 63787.1473 m3.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 627.24 Ati s
Uncontrolled Keywords: Kanal Water Intake, Laju Sedimentasi, Modifikasi Jetty, Canal Water Intake, Sedimentation Rate, Jetty Modification
Subjects: Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport.
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM731 Marine Engines
Divisions: Faculty of Marine Technology > Marine Engineering > (S1) Undergraduate Theses
Depositing User: Mrs Anis Wulandari
Date Deposited: 07 Jul 2017 07:54
Last Modified: 26 Dec 2018 06:41
URI: http://repository.its.ac.id/id/eprint/41920

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