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All Journal JURNAL TEKNIK HIDRAULIK Jurnal Teknik Sumber Daya Air
Rahadiansyah, Shakti
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Civil Engineering, Building, Construction & Architecture Energy Engineering Environmental Science

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Pemodelan Degradasi dan Agradasi Dasar Sungai dengan Beberapa Persamaan di Sungai Winongo Yogyakarta Harsanto, Puji; Sutri, Galuh Nanda; Rahadiansyah, Shakti; Lesmana, Surya Budi
JURNAL TEKNIK HIDRAULIK Vol 15, No 2 (2024): JURNAL TEKNIK HIDRAULIK
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v15i2.768

Abstract

Calculating riverbed degradation and aggradation is essential in designing riverbank protection structures, particularly for determining foundation depth. Excessive degradation can compromise foundation stability, significantly increasing the risk of structural failure. Numerous predictive models for egradation and aggradation have been developed by researchers, highlighting the importance of selecting an equation that closely aligns with the specific characteristics of the river to achieve optimal design accuracy. This study aims to determine the most suitable predictive model for riverbed degradation and aggradation. A case study was conducted along a 43.75 km of the Winongo River Yogyakarta. The simulation involved riverbed sediment data collected at 500 m intervals from upstream to downstream, and secondary discharge data comprising average daily discharge for both wet and dry months. The selected grainsize parameter follows standards in HEC-RAS 6.3.1, with the Meyer Peter Müller equation applied to d90, Engelund Hansen to d50, and Laursen Copeland to d84. Simulation results of riverbed degradation were then compared against observed conditions of riverbank erosion. Riverbank steepness or protective structure failure indicates excessive riverbed degradation, while stable conditions suggest otherwise. Based on the simulations conducted on the Winongo River, the Engelund Hansen equation provided average degradation estimates more consistent with field conditions than the other two equations.Keywords:  degradation and agradation, transport sediment equations, HEC-RAS, river bank
Penelusuran Waduk Mrica untuk Analisis Perubahan unjuk Kerja Fungsi dan Efisiensi Penggelontoran Sedimen : Mrica Reservoir Routing for The Analysis of Change In Functional Performance and Sediment Flushing Efficiency Rahadiansyah, Shakti; Ariyanti, Vicky; Sulaiman, Muhamad; Kurniawan, Adhy; Legono, Djoko
Jurnal Teknik Sumber Daya Air Vol. 5 No. 2 (Desember 2025)
Publisher : Himpunan Ahli Teknik Hidraulik Indonesia (HATHI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56860/jtsda.v5i2.153

Abstract

Mrica Reservoir, also known as the Panglima Besar Soedirman Dam, was constructed in 1982 and serves multiple purposes, including electricity generation, irrigation, and flood control. The main problem faced over the past decade is the very active sedimentation of the reservoir, which is felt to have caused a decline in the reservoir's function as originally planned. This paper presents the results of evaluating the efficiency of sediment removal from Mrica Reservoir by flushing. The RESROUT2 (Reservoir Routing Version 2) was developed to study the water (and sediment) balances and to evaluate the influence of changes in the characteristics of the Mrica Reservoir (with a specific reservoir inflow characteristic) on the outflow pattern. Reservoir outflow is made possible by regulating the output facilities, such as spillways, intake structures for power and irrigation, power generation, and a drawdown culvert to release sediment. The volume of flow out through the bottom outlet and the flushing efficiency for 5 hours are 4.354 million m3 and 0.167, respectively, while for 3 hours of flushing, they are 2.476 million m3 and 0.221, respectively. Increasing the efficiency of sediment flushing in the Mrica Reservoir still needs to be pursued along with efforts to reduce its negative impacts.
Co-Authors Adhy Kurniawan Ariyanti, Vicky Djoko Legono Puji Harsanto Sulaiman, Muhamad Surya Budi Lesmana Sutri, Galuh Nanda