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Sari, Andi Kartini
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STUDI SEDIMEN TERHADAP PILAR PADA JEMBATAN RUMAJU KECAMATAN BAJO, KABUPATEN LUWU Sari, Andi Kartini
Jurnal Ilmiah Ecosystem Vol. 18 No. 2 (2018): ECOSYSTEM VOL 18 NO. 2 Mei - Agustus 2018
Publisher : Lembaga Penelitian dan Pengabdian pada Masyarakat Universitas Bosowa

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Sungai Bajo terletak di Kabupaten Luwu Provinsi Sulawesi Selatan, berjarak ± 15.85 km dari ibukota Kabupaten Luwu. Secara garis besar tekstur dan kondisi topografi daerah sekitar sungai Bajo bisa di kategorikan sebagai daerah dataran rendah yang amat landai, di daerah hulu dari pada sungai ini memiliki kemiringan lereng (7,5 – 10).10-3, dan hilir (1 – 2).10-2 . Sungai ini berhulu di Desa Bastem, Kecamatan Bajo Barat dengan ketinggian + 2390 m, kemudian melintasi Kecamatan Bajo, dan bermuara di Kecamatan Suli dengan panjang sungai 44,35 km dengan luas DAS 380 km2 dan lebar sungai rata-rata 30 s/d 120 m. Berdasarkan klasifikasi sungai maka sungai Bajo termasuk jenis sungai pegunungan, mengingat sumber air atau daerah hulunya mengalir dari gunung. Karena bentuk sungai tersebut bisa dikatakan sejajar, maka sungai Bajo adalah sungai yang bertipe cabang pohon. Lapisan tanah tebing sungai berupa pasir halus, Silty sand yang mudah longsor. Di ruas bagian tengah pada saat musim hujan atau debit air tinggi, terlihat kandungan sedimen karena air yang mengalir menampakkan kekeruhan. Proses sedimen transport merupakan suatu fenomena alam yang ada dan terjadi pada aliran sungai.Proses Sedimentasi dapat terjadi secara alamiah sebagai bagian dari morfologi sungai dan dapat terjadi pula akibat adanya bangunan sungai (man-made structures) yang menghalangi aliran, berupa crib, pilar, abutmen jembatan dan sebagainya. Keberadaan bangunan sungai tersebut dipandang dapat mengubah geometri alur serta pola aliran sungai.Sedimen yang terbawa air lebih dominan tertumpuk pada bagian hilir, Karena aliran air pada sungai mempunyai energi, sehingga mampu mengangkut sedimen. Sebagai konsekuensi dari angkutan sedimen tersebut maka terjadi kerusakan sehingga berpengaruh pada struktur bangunan jembatan.
KAJIAN PENDAPATAN PENGELOLAAN WADUK BATU BESI PLTA KAREBBE, SOROWAKO-LUWU TIMUR, SULAWESI SELATAN Sari, Andi Kartini
Jurnal Ilmiah Ecosystem Vol. 16 No. 2 (2016): Ecosystem Vol. 16 No 2, Mei - Agustus 2016
Publisher : Lembaga Penelitian dan Pengabdian pada Masyarakat Universitas Bosowa

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Batu Besi Reservoir in the Luwu Timur Sulawesi Selatan Regency has been operated since January, 1988 and played significant role in determining the success of water resources utilization as Water Power Generation Plant (PLTA). Daily Inflow entering the reservoir is the record made at AWLR PT. INCO station from 1988 to 2004 with inundation and catchment area width of 585 km2 and 2,477 km2, effective and dead volumes of 1,938.86 MCM and 169.70 MCM, or 2,108.56 MCM in gross volume. Reservoir bin is utilized to fulfill the operational need of PT. INCO, a nickel mining company , in processing the nickel ore.Up to now, the objectives of water resource infrastructure, especially reservoir, are to supply electricity needed by the company to process the nickel ore and to achieve the reservoir autonomy. Such management is expected to give capability in financing the reservoir operational and maintenance in order to give direct income contribution to to regional government. All constraints, parameters and related variables consisted in the reservoir system should be calculated as much as possible in determining the reservoir operational guide, therefore, water resources can be utilized effectively and efficiently for fulfilling the company needs.PLTA Karebbe is the third water power generation plant, with 90 MW capacity, owned by PT. Internasional Nickel Indonesia (INCO), which is located in Larona Rive,. Up to the third quarter of 2009, the Karebbe project has reached 23% and expected to be finished 2012 and started for operation in mid 2012. The study of Batu Besi reservoir pattern in PLTA Karebbe for 37 years ahead of development and management consists of income analysis from the reservoir management. It is calculated using multiplication of water released into the reservoir with unit price of electricity tariff of each demand in order to calculate the electricity monthly use and income gained by PT.INCO for the last 37 years ahead (1998-2035). The amount of power released is significantly dependent to debit and effective pressure height in the reservoir. Every reservoir cost since the beginning of operation is calculated that includes the amount of income gained and the reservoir maintenance and operational costs. Annual average income due to reservoir water utilization in increasing the nickel productivity is Rp 619.467,864 per Kwh with total income of Rp.23.539.778,855 per Kwh and total electricity use of 69.631 Gwh.
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