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All Journal Journal of the Civil Engineering Forum Jurnal Teknik Sumber Daya Air
Istiarto
Universitas Gadjah Mada
Civil Engineering, Building, Construction & Architecture Energy Engineering Environmental Science

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Pengembangan Model Optimasi Pemanfaatan Air Waduk Serbaguna Wonogiri Paska Pembangunan Closure Dike Yotam Adiel Haryanto; Rachmad Jayadi; Istiarto
Jurnal Teknik Sumber Daya Air Vol. 2 No. 1 (Juni 2022)
Publisher : Himpunan Ahli Teknik Hidraulik Indonesia (HATHI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (869.999 KB) | DOI: 10.56860/jtsda.v2i1.25

Abstract

Untuk mengatasi persoalan sedimentasi Waduk Serbaguna Wonogiri telah dibangun closure dike yang menyebabkan terbentuknya dua buah tampungan, yaitu main reservoir (MR) dan sediment storage reservoir (SSR). Oleh karena itu potensi pemanfaatan air Waduk Serbaguna Wonogiri perlu dikaji ulang dengan mempertimbangkan kondisi terkini tampungan waduk. Penerapan usulan pedoman operasi waduk baru yang telah disiapkan dapat digunakan untuk evaluasi kinerja pemanfaatan air menggunakan pendekatan model optimasi. Pada makalah ini disampaikan hasil pengembangan awal model optimasi pemanfaatan air Waduk Serbaguna Wonogiri berbasis simulasi neraca air dalam bentuk perangkat lunak menggunakan pemrograman Microsoft Visual Studio 2019. Pengaturan release waduk didasarkan pada pedoman operasi waduk sesuai rekomendasi Nippon Koei Co. Ltd. tahun 2016 menggunakan algoritma optimasi metode Brute Force. Output dari perangkat lunak selanjutnya dianalisis untuk evaluasi kinerja operasi waduk. Simulasi neraca air waduk dilakukan dengan variasi nilai control water level (CWL), kondisi aliran inflow yaitu tahun basah, normal dan kering, serta skenario target release. Hitungan model optimasi pengaturan release waduk menggunakan perangkat lunak yang dibuat dapat dilakukan secara cepat dengan hasil yang akurat. Hasil analisis menunjukkan bahwa recovery muka air MR berhasil tercapai jika digunakan CWL +136,30 m dan hanya pada kondisi inflow tahun basah. Tingkat pemenuhan kebutuhan air rerata pada ketiga kondisi inflow tersebut berturut-turut sebesar 99,75%; 98,75%; 97,08% untuk CWL +135,80 m dan sebesar 99,83%; 98,75%; 94,58% untuk CWL 136,30 m.
The Development of Ungauged-Catchment Integrated-Similarity Unit Hydrograph to Estimate Inflow of Wonogiri Reservoir Kurniawan Putra Santoso; Istiarto; Rachmad Jayadi
Journal of the Civil Engineering Forum Vol. 9 No. 3 (September 2023)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.7051

Abstract

The Wonogiri Reservoir is a multipurpose reservoir at the Upper Bengawan Solo Watershed, primarily designed to serve as a flood control system. However, there is no accurate estimation of the inflow into the reservoir due to the limited availability of hydrological stations. Observations showed only four out of ten unit hydrographs of the Wonogiri Reservoir watershed. Therefore, this study was conducted to apply an integrated similarity-based approach for designing unit hydrographs in ungauged catchments. The process involved evaluating the integrated similarity between pairs of gauged-ungauged catchments using hydrologic and physical property parameters. This led to the selection of the donor or gauged catchment with the highest similarity score to develop the unit hydrograph for the ungauged catchments. The developed UHs were further applied to estimate the reservoir inflow for the December 25, 2007, flood event. The results showed that the computed peak discharge was 10.9% lower than a previous study. Subsequently, the HEC-HMS simulation model was used to project the updated design flood hydrographs to the reservoir. The design rainfall was derived from automatic rainfall recorder (ARR) and PERSIANN satellite-based data. The ARR data showed that the extreme rainfall duration was 5 hours while satellite data indicated 6 hours. The application of the ARR 5-hour duration to the updated flood hydrographs led to a peak discharge of 5123 m3 s-1, 7041 m3 s-1, and 10,370 m3 s-1 for the 60-year, 500-year, and PMF floods respectively in line with the flood design criteria of Wonogiri Reservoir. These estimates were observed to be significantly higher than the 1982 design floods which were 4000 m3 s-1, 5100 m3 s-1, and 9600 m3 s-1 respectively. This updated flood control design was important to renew the operation rule of the Wonogiri reservoir during flood periods.
Co-Authors Kurniawan Putra Santoso Rachmad Jayadi Yotam Adiel Haryanto