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All Journal REKA RACANA JURNAL TEKNIK HIDRAULIK
Raden Indra Anggun Gemilang
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Civil Engineering, Building, Construction & Architecture Education Engineering

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Rehabilitasi Pantai Berlumpur Dengan Pegar Geobag Rangka Bambu Di Desa Sriwulan Kabupaten Demak Muhamad Reza Robby Nugraha; Raden Indra Anggun Gemilang
JURNAL TEKNIK HIDRAULIK Vol 8, No 2 (2017): Jurnal Teknik Hidraulik
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2059.882 KB) | DOI: 10.32679/jth.v8i2.324

Abstract

Coastal erosion, tidal flooding, and land subsidence on the Northern Coast of Central Java, especially on Demak Regency,Sriwulan District have resulted in environmental degradation and coastal retreat. In effort to restore and protect nearly submerged coastal area, through the Building with Nature Project,  Research Center for Water Resources recommends the application of a Low Crested Breakwaters (LCB) structure with bamboo frame as a protective and sediment catcher structure. Prior to the field applied, a numerical model test was performed to see the hydro-oceanographic and morphological response around the structure. Numerical modeling is done using MIKE21 software by creating three model scenarios, LCB with length 75 meters, 500 meters, and 1000 meters. LCB with a length of 75 meters is the LCB to be installed in Sriwulan district while LCB 500 meters and 1000 meters are used to see the spread of sediments If using LCB that longer and has a gap. The results of the numerical model test show that LCB is capable to reduce wave energy, with wave height behind structure reaching 0.04 meters when low tide condition and 0.07 meters during high tide condition. Model simulation results for 5 years showe three LCB sizes with length 75, 500, and 1000 meters for sedimentation behind LCB of 25 cm. The results of monitoring on the performance of PEGAR Geobag prototype in Sriwulan Beach in May 2017 resulted in sediment between 15 cm-25 cm. 
Efektifitas Redaman Energi Gelombang Akibat Adanya Breakwater Terapung Ditinjau dari Model Fisik dan Studi Numerik Raden Indra Anggun Gemilang; Yessi Nirwana Kurniadi
RekaRacana: Jurnal Teknil Sipil Vol 2, No 3: September 2016
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v2i3.147

Abstract

ABSTRAKGelombang laut memiliki energi yang dapat mengakibatkan ketidakstabilan terhadap kondisi garis pantai di kawasan pesisir. Permasalahan tersebut perlu diatasi dengan dibuat suatu struktur yang mampu mereduksi energi gelombang salah satunya dengan menggunakan pemecah gelombang terapung. Tujuan penelitian ini untuk mengetahui seberapa efektif redaman energi berdasarkan besarnya koefisien transmisi ( ) dari struktur pemecah gelombang terapung yang telah didesain sedemikian rupa. Pengujian dilakukan dengan metode uji model fisik dan studi numerik dengan menggunakan software analisis gelombang 2D. Hasil pengujian model fisik diperoleh redaman energi gelombang akibat adanya pemecah gelombang terapung berkisar 11%-30% sedangkan dari pengujian numerik energi yang diredam mencapai 23%-58%. Hasil penelitian menunjukan struktur pemecah gelombang terapung yang telah didesain mampu untuk mereduksi energi yang diakibatkan oleh gelombang.Kata kunci: koefisien transmisi, pemecah gelombang terapung, Model Fisik, Studi NumerikABSTRACTWave have energy that can cause unstability of shoreline around coastal area. floating breakwater are one of structure that can solve the coastal area problem by reduce the wave energy. In this research, it is investigated the effectiveness of  floating breakwater  to reduce the waves energy based on the value of transmission coefficient ( ). The test performing by physical and numerical model using waves 2D model analysis Software. Physical model test results obtained a floating breakwater model can reduce the waves energy ranges from 11%-30%, while numerical model test reach from 23%-58%, so that the floating breakwater are capable to reduce the wave enegy.Keywords: transmission coefficient, floating breakwater, physical model, numerical Model
Co-Authors Muhamad Reza Robby Nugraha Yessi Nirwana Kurniadi