Analisa Pola Operasi Waduk Bajulmati

Susanti, Erlin (2019) Analisa Pola Operasi Waduk Bajulmati. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kabupaten Banyuwangi merupakan kota yang berkembang dengan mata pencaharian masyarakat sebagian besar berasal dari sektor pertanian. Dengan adanya perkembangan penduduk, kebutuhan akan air baku dan irigasi akan semakin meningkat. Beberapa permasalahan yang sering terjadi di Banyuwangi adalah terjadinya kekeringan pada musim kemarau dan saat musim hujan selalu mengalami surplus air yang mengakibatkan banjir akibat meluapnya sungai yang berhulu di Gunung Baluran dan Pegunungan Ijen dan kondisi saat ini waduk belum sepenuhnya memberikan manfaat yang optimal dikarenakan pola operasi waduk rule curve elevasi yang dipakai selama ini sudah tidak sesuai dengan kondisi sekarang. Maka pada penelitian ini mencoba melakukan “Analisa Pola Operasi Waduk Bajulmati” sehingga waduk tersebut diharapkan dapat memberikan kinerja yang optimal baik dalam pemanfaatan untuk irigasi, air baku dan Pembangkit Listrik Tenaga Mikro Hidro (PLTMH). Penelitian ini diawali dengan studi literatur, pengumpulan data, analisa data untuk ketersediaan dan pemanfaatan air waduk dengan pemodelan hidrologi berupa perhitungan debit aliran Sungai Bajulmati sebagai inflow waduk dengan menggunakan Metode FJ. Mock. Dilanjutkan dengan perentangan debit inflow waduk kedepan selama 50 tahun dengan Metode Markov. Selanjutnya, pembentukan model dan simulasi. Simulasi dilakukan dengan dua alternatif, yakni pertama simulasi dilakukan sesuai pengoperasian waduk saat ini, yaitu diprioritaskan untuk irigasi (faktor kT = 100% dengan perbedaan pada cara perhitungan kebutuhan air irigasi), air irigasi dilewatkan melalui turbin (PLTMH) dan kelebihan air yang dialirkan lewat spillway kemudian dialirkan lewat turbin untuk listrik. Pada alternatif dua, waduk dioperasikan dengan pemenuhan air baku, irigasi faktor kT≥70%, kelebihan air yang dialirkan lewat spillway dan PLTMH dioptimalkan dengan pertimbangan ketersediaan air di waduk. Hasil simulasi menunjukkan pengoperasian waduk (alternatif dua) memproduksi listrik (PLTMH) lebih tinggi daripada alternatif satu, alternatif ke-2 tersebut mampu menaikkan produksi listrik rata-rata per tahun menjadi menjadi 2,823 GWH (122,74% dari kondisi saat ini) jika turbin harus beroperasi penuh (alternatif 2A) dan 2,852 GWH (124,00% dari kondisi saat ini) jika turbin dengan 20% daya maksimal sudah beroperasi (alternatif 2B), dengan pemenuhan air irigasi (faktor kT) 2,26. Alternatif ke-1 hanya mampu menaikkan produksi listrik per tahun menjadi 2,488 GWH (108,17% dari kondisi saat ini) jika turbin harus beroperasi penuh (alternatif 1A), dan 2,796 GWH (121,57% dari kondisi saat ini) jika turbin dengan 20% daya maksimal sudah beroperasi (alternatif 1B) dengan faktor kT 2,45. Dari analisa pendapatan (tanpa memperhitungkan biaya dan dengan asumsi pemberian air irigasi dilakukan serentak) diketahui pendapatan tertinggi diperoleh alternatif 1B sebesar Rp. 338,69 milyar, tertinggi berikutnya adalah alternatif 1A sebesar Rp. 338,41 milyar, tertinggi ketiga alternatif 2B sebesar Rp. 313,03 milyar dan pendapatan terendah alternatif 2A sebesar Rp. 313,00 milyar.
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Banyuwangi Regency is a developing cities with the livelihoods of the majority of the people coming from the agricultural sector. With the development of the population, the need for raw water and irrigation will increase. Some of the problems that often occur in Banyuwangi are the occurrence of droughts that occur during the dry season and during the rainy season there is always a surplus of water resulting in flooding due to overflowing rivers that are upstream in Mount Baluran and Ijen Mountains and the current conditions of the reservoir have not fully provided optimal benefits due to patterns the rule curve elevation reservoir operation that has been used so far is not in accordance with the current conditions. So in this research try to do "Analysis of Bajulmati Reservoir Operation Pattern" so that the reservoir is expected to provide optimal performance both in utilization for irrigation, raw water and Micro Hydro Power Plant (PLTMH). This research begins with a literature study, data collection, data analysis for the availability and utilization of reservoir water by hydrological modeling in the form of calculating the Bajulmati River flowrate as an inflow of reservoirs using the Mock Method. Followed by stretching the discharge of the reservoir reservoir in the future for 50 years with the Markov Method. Next, model building with dynamic programming and simulation. The simulation was carried out with two alternatives, namely the first simulation was carried out according to the operation of the current reservoir, which is prioritized for irrigation (kT factor = 100% with differences in the way irrigation water requirements are calculated), irrigation water passed through the turbine (PLTMH) and excess water collected spillway for electricity. In alternative two, the reservoir is operated with the fulfillment of irrigation and raw water with a factor of kT≥70%, the excess water stored in spillway and the PLTMH is optimized considering the availability of water in the reservoir. Simulation results show the operation of reservoirs (alternative two) producing electricity (PLTMH) is higher than alternative one, the second alternative is able to increase electricity production on average per year to become 2,823 GWH (122,74% of current conditions) if the turbine must be fully operational (alternative 2A) and 2,852 GWH (124,00% of current conditions) if a turbine with 20% maximum power is already operating (alternative 2B), with irrigation water fulfillment (kT factor) 2.26. Alternative 1 is only able to increase electricity production per year to 2,488 GWH (108,17% of current conditions) if the turbines must be fully operational (alternative 1A), and 2,796 GWH (121,57% of current conditions) if turbines with 20% of maximum power is already operating (alternative 1B) with a kT factor of 2.45. From the income analysis (without calculating costs and assuming irrigation water is carried out simultaneously) it is known that the highest income obtained alternative 1B of Rp. 338.69 billion, the next highest is alternative 1A of Rp. 338.41 billion, the third highest is alternative 2B of Rp. 313.03 billion and the lowest income is alternative 2A is Rp. 313.00 billion.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Pattern of Reservoir Operation, Simulation, Water Balance
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs T Technology > TC Hydraulic engineering. Ocean engineering > TC812 Irrigation
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22101-(S2) Master Theses
Depositing User:	Erlin Susanti
Date Deposited:	22 Jul 2026 04:29
Last Modified:	22 Jul 2026 04:29
URI:	http://repository.its.ac.id/id/eprint/70526

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