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Asep Irwan
Teknik Sipil, Fakultas Teknik dan Desain, Institut Teknologi Sains Bandung
Civil Engineering, Building, Construction & Architecture

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Identifikasi Distribusi Beban Sedimentasi pada Intake DAM dan Reservoir PLTA (Studi Kasus: PLTA Cirata, Purwakarta – Jawa Barat) Asep Irwan; Ari Wicaksono; Firda Aulia Khairin
JOURNAL OF APPLIED SCIENCE (JAPPS) Vol 2, No 1 (2020): Journal Of Applied Science (JAPPS)
Publisher : Institut Teknologi Sains Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36870/japps.v2i1.159

Abstract

Reservoirs in Indonesia are almost inseparable from the problem of sedimentation. Sedimentation issues are important in reservoir operations, including those that affect reservoir life. One of them is in the PLTA Cirata which experienced a high amount of sedimentation, based on the results of research by BPWC in 2017 the value of sedimentation was 1.96 million m3/year. The results obtained 1,565,844.51 m3 / year so that when compared with this value has a difference between 394,155.49 m3 / year, this occurs because of differences in the sedimentation calculation method. The research method uses the MIKE 21 Module (Flow Model), this research can provide information related to the sedimentation load in the PLTA Cirata. Sediment load that occurs in the intake area of the modeling results is from the Cikundul watershed with a maximum flow value in one year in 2018 of 716.14 m3/s occurred in April. As for the thickness of sediment occurs first 1-month simulation results in the location of each estuary is between 0.01 to 0.15 m for the location of the dam area of 0.01 to 0.03 m. The thickness of sediments in the Cirata area at the location of the river mouth is around ± 1.8 m / year and at the dam around ± 0:36 m / year. Types of sediment in each river mouth obtained 21.21% sand, 78.48% silt, and 0.31% gravel, for the dam area obtained 24.49% sand, 75.08% silt, and 0.43% gravel. It can be concluded that sedimentation entering the Intake area is removing sediment from each watershed namely Cikundul, Cibalagung, Cisokan, Citarum, and Cicendo.
Analisis Abrasi Pantai Pada Akses Jalan Bahumbelu – Morowali Sulawesi Tengah Asep Irwan
JOURNAL OF APPLIED SCIENCE (JAPPS) Vol 1, No 2 (2019): Journal Of Applied Science (JAPPS)
Publisher : Institut Teknologi Sains Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36870/japps.v1i2.46

Abstract

Abrasi pantai yang terjadi pada akses jalan Bahumbelu menuju Morowali Sulawesi Tengah saat ini kondisinya sudah mengkwatirkan, lokasi yang berhadapan langsung dengan laut terbuka dan sering terjadi hantaman gelombang laut sehingga dapat mengakibatkan bibir pantai semakin mundur dan masuk ke daratan. Meskipun saat ini dibeberapa titik sudah terpasang oleh tembok laut atau sea wall namun erosi dibeberapa tempat sudah terjadi dan mengakibatkan jalan amblas terutama yang belum diapasang seawall. Tujuan dari penelitian ini adalah melakukan analisis abrasi pantai dengan bantuan program GENESIS, program ini digunakan untuk memprediksikan garis pantai dalam jangka panjang sebagai reaksi terhadap kondisi gelombang pada struktur bangunan pelindung pantai. Prediksi ini dimaksudkan untuk mengetahui perubahan garis pantai yang terjadi dalam kurun waktu tertentu berdasarkan kondisi eksisting sehingga dapat diketahui perubahan garis pantai yang terjadi. Data yang digunakan dalam penelitian ini adalah data hasil pengukuran lapangan yaitu berupa data kedalaman perairan, garis pantai dan data hasil pengolahan gelombang dari data angin. Berdasarkan hasil simulasi yang dilakukan dengan kala ulang 2 tahun perubahan garis pantai terjadi abrasi sebesar 4 meter dan akresi yang terjadi sebesar 3 meter dengan volume sedimen -1360 m3. Nilai negatif pada volume sedimen tersebut menunjukkan terjadinya erosi. Pada area sekitar bangunan pelindung pantai eksisting terjadi perubahan garis pantai sebesar 3,5 meter akresi dan 4 meter abrasi. Selanjutnya hasil simulasi kala ulang 5 tahun dan 10 tahun cenderung meningkat dimana kecenderungan perubahan garis pantai masih mengikuti pola hasil tahun sebelumnya yang artinya pola akresi dan abrasi masih belum pada titik keseimbangan sehingga terjadi perubahan pola perubahan garis pantai baru. Sehingga berdasarkan hasil simulasi GENESIS didapatkan rekomendasi penanganan terhadap ancaman abrasi pada lokasi studi yaitu dengan memperbaiki tembok laut eksisting dan menambahkan struktur pelindung pantai yang dibuat sejajar pantai yaitu Revetment.
Simulasi Pemodelan Numerik Hidrodinamika dan Aliran Sedimen pada Bendung PLTA Musi – Bengkulu Asep Irwan; Dimas Setiya Gunawan; Martin Wahyunus; Hadi Mulyanto
JOURNAL OF APPLIED SCIENCE (JAPPS) Vol 2, No 2 (2020): Journal of Applied Science (JAPPS)
Publisher : Institut Teknologi Sains Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36870/japps.v2i2.179

Abstract

This research aims to identify Hydro-Power Plant (PLTA) sedimentation in Musi-River, Bengkulu, Indonesia. Based on field observation and simulation modeling Surface Modeling System 8.01. High sediment levels cause accumulation of reservoirs and loss of direct storage, which in turn causes loss of production potential for the Musi Hydro-Power Plant, Bengkulu. The data used in this modeling are bathymetry, current velocity of measurement results, water level, and grain size of sediment. Based on field observations, it was found that basic sediment types were dominated by silt and sand. The highest elevated sediment content values of 0.166 gr/l, current velocity in the upstream was 0.54 - 0.61 m/s while the middle section was 0.43 m/s. After the hydrodynamic model is carried out, then the sedimentation model has values that vary throughout the area model, this is influenced by several factors, one of which is the current movement that can affect the amount of water bottom friction. Volume of sediments obtained in the weirs at the PLTA Musi is 211,588 m3 during the simulation of 1 month if multiplied in 1 year, then it obtained 2539,056 m3. From the results of this research, PLTA Musi must prevent this sedimentation bymaking sediment traps in the upstream.
Co-Authors Ari Wicaksono Dimas Setiya Gunawan Firda Aulia Khairin Hadi Mulyanto Martin Wahyunus