PERBANDINGAN ANTARA MODEL ATURAN LEPASAN BERDASARKAN TAMPUNGAN DAN MODEL RULE CURVE UNTUK WADUK PENGGA
Abstract
Abstrak : Penelitian ini untuk membandingkan anÂtaÂra 2 alternatif aturan operasi waduk Pengga dalam mengatur debit lepasan guna memenuhi kebutuhan sepanjang tahun. Waduk Pengga beroperasi dengan periode ½ bulanan. Ada 2 alternatif yang disarankan untuk waduk Pengga, yaitu (1) aturan lepasan yang berdasarkan status tampungan waduk pada awal periode operasi, dan (2) rule curve sebagai batas bawah tampungan waÂduk pada setiap periode operasi. AÂturÂan operasi lepasan waduk dari masing-masing alternatif diÂopÂtimasi untuk meÂningÂkatÂkan kinerjanya sampai mencapai batas maksimum, lalu dilakukan perbandingan antara kedua alternatif tersebut. Sebelum dilakukan optimasi, dilakukan revisi terhadap struktur daripada maÂsing-masing aturan operasi untuk meningkatkan potensi perbaikan kinerja daÂlam optimasi. Pada aturan lepasan berdasarkan tampungan, revisi struktur diÂpuÂsatÂkan pada peningkatan jumlah grid tampungan, sementara juga dicoba alternatif bentuk garis lepasan yang kontinyu disamping bentuk diskrit. Sedangkan pada rule curve, reÂviÂsi struktur dipusatkan pada penambahan kurva-kurva sebagai batas bawah pelepasan bertingkat. Untuk melakukan optimasi diÂguÂnakan prosedur Evolutionary Solver yang ada paÂda perangkat Add-Ins Solver dari MS-Excel 2010.
Kata kunci: aturan lepasan, status tampungan, rule curve.
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Abstract : This research is the comparison of two alternatives of operating rule of the Pengga Reservoir for regulating the releases to fulfill the annual water demand. The Pengga Reservoir operate in half-month periods. Two alternatives being proposed for the release operating rule of Pengga Reservoir, (1) the release rule based on the reservoir storage state at the beginning of operating period, and (2) the Rule Curve as the lower boundary of reservoir storage at every operating period. The reservoir release operating rule of each alternative is optimized to improve its performance until attain the maximum limit, then the comparison is conducted between the two alternatives. Before the optimization, structural revisions are done on each operating rule to enhance the potency of performance improvement in the optimization. In the Release Rule based on storage, the revisions are focused on the expansion of number of storage grid, beside also the trial shape of continuous release line instead of discrete. As for the Rule Curve, the revisions are focused on the additional curves as the lower bounds of stepped release. The undertaking of this optimization study will use the Evolutionary Solver procedure in Add-Ins Solver package of the MS-Excel 2010.
Keywords: release rule, storage state, rule curve.
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