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All Journal Civil Engineering Forum Teknik Sipil Jurnal Ilmiah Teknik Sipil International Journal of Science and Engineering (IJSE) MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Ilmiah Desain & Konstruksi IPTEK The Journal for Technology and Science Jurnal Teknik Sipil Jurnal Teknik Pengairan: Journal of Water Resources Engineering Semesta Teknika Teknisia Eco Rekayasa Jurnal Teknik Sipil Journal of the Civil Engineering Forum Civil Engineering Journal FROPIL (Forum Profesional Teknik Sipil) Civil and Environmental Science Journal (CIVENSE) JURNAL TEKNIK HIDRAULIK JURNAL SUMBER DAYA AIR Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Community Empowerment Prosiding Seminar Nasional Teknik Sipil UMS Jurnal Geografi LIngkungan Tropik (Journal of Geography of Tropical Environments) LIMNOTEK

Djoko Legono

Departemen Teknik Sipil Dan Lingkungan, Fakultas Teknik, Universitas Gadjah Mada

Author-ID : 305546

Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Engineering Environmental Science Public Health Social Sciences Transportation

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METODE UJI KETELITIAN UNJUK KERJA ALAT UKUR DENGAN PENERAPAN PERSAMAAN DISTRIBUSI NORMAL (CONTOH KASUS LASER DOPPLER ANEMOMETER) Agatha Padma Laksitaningtyas; Djoko Legono; Bambang Yulistiyanto
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 24, No. 1, Januari 2020
Publisher : Department of Civil Engineering, Udayana University

Statistika dan probabilitas merupakan salah satu cara yang digunakan dalam proses sinyal secara digital. Proses sinyal secara digital berfungsi untuk mengukur, mengelompokkan dan memproses menjadi komponen data yang menyinggung suatu obyek. Menentukan rasio daya sinyal ke “noise” pada penerimaan sistem input dan output sangat penting untuk memperkirakan kualitas dan kapasitas penerimaan sinyal dari suatu alat Laser Doppler Anemometer (LDA). LDA merupakan salah satu contoh peralatan ukur yang berfungsi untuk mengukur kecepatan yang akan mengeluarkan frekuensi sehingga menghasilkan sinyal. Masalah mendasar dalam pengukuran sinyal adalah bagaimana membedakan sinyal mendasar yang sebenarnya dari “noise”. Tujuan dari penelitian ini untuk menguji ketelitian unjuk kerja alat ukur untuk menentukan “noise” dari sinyal yang dikeluarkan oleh LDA. Analisis yang digunakan dengan menggunakan metode persamaan distribusi normal yang akan menghasilkan suatu nilai batas untuk sinyal dan noise. Pengujian dilakukan pada dua buah saluran terbuka di laboratorium berbentuk U dan S. Pada Saluran U terdapat empat titik pengujian, sedangkan untuk saluran S terdapat 8 titik pengujian. Untuk masing-masing titik dilakukan tiga kali pengujian. Uji akurasi dari pembacaan sinyal LDA menunjukkan bahwa frekuensi pembacaan sinyal pada saluran U yaitu 92,47% dengan nilai “noise” bernilai 7,53%. Uji akurasi dari pembacaan sinyal LDA menunjukkan bahwa frekuensi pembacaan sinyal pada saluran S yaitu 93,74% dengan nilai “noise” bernilai 6,26%.

Reservoir Operation to Minimize Sedimentation Dyah Ari Wulandari; Djoko Legono; Suseno Darsono
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

The Wonogiri Reservoir capacity decreases rapidly, caused by serious sedimentation problems. In 2007, JICA was proposed a sediment storage reservoir with a new spillway for the purpose of sediment flushing / sluicing from The Keduang River. Due to the change of reservoir storage and change of reservoir system, it requires a sustainable reservoir operation technique. This technique is aimed to minimize the deviation between the input and output of sediments. The main objective of this study is to explore the optimal Wonogiri reservoir operation by minimizing the sediment trap. The CSUDP incremental dynamic programming procedure is used for the model optimization. This new operating rules will also simulate a five years operation period, to show the effect of the implemented techniques. The result of the study are the newly developed reservoir operation system has many advantages when compared to the actual operation system and the disadvantage of this developed system is that the use is mainly designed for a wet hydrologic year, since its performance for the water supply is lower than the actual reservoir operations.Doi: 10.12777/ijse.6.1.16-23 [How to cite this article: Wulandari, D.A., Legono, D., and Darsono, S., 2014. Reservoir Operation to Minimize Sedimentation. International Journal of Science and Engineering, 5(2),61-65. Doi: 10.12777/ijse.6.1.16-23]

EFEKTIVITAS PENGGELONTORAN SEDIMEN (FLUSHING) STUDI KASUS WADUK PB SOEDIRMAN Bella Koes Paulina Cantik; Djoko Legono; Adam Pamudji Rahardjo
Jurnal Teknik Sipil Vol. 16 No. 1 (2020)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Sedimentasi waduk menjadi salah satu masalah kompleks yang harus ditangani secara tepat. Banyak upaya pemeliharaan waduk yang dilakukan agar umur teknis waduk dapat bertahan sesuai perencanaan, salah satu diantaranya adalah pengeluaran sedimen dari dalam waduk dengan cara flushing. Flushing atau penggelontoran sedimen dalam jumlah yang masif menjadi salah satu solusi yang ditawarkan untuk mengurangi sedimen yang terlanjur mengendap guna mencapai efektivitas dan efisiensi pembuangan sedimen dari dalam waduk. Waduk Mrica merupakan salah satu waduk di Indonesia yang rutin melakukan flushing sebagai upaya pemeliharaan. Flushing Waduk Mrica melalui drawdown culvert (DDC) sudah dilakukan sejak tahun 1992 namun volume aktif waduk semakin menurun setiap tahunnya. Tujuan dari penelitian ini untuk mengevaluasi kinerja flushing dengan menghitung nilai flushing feasibility dengan mendasarkan pada praktik atau pelaksanaan flushing Waduk Mrica selama ini serta berdasarkan kriteria dan rumus pendekatan. Hasil analisis menunjukkan bahwa nilai efektivitas tertinggi adalah pada tahun 2014 dengan nilai 0,059 untuk Metode Morris & Fan dan Metode Qian, dan 0,067 untuk Metode Lai & Shen. Sedangkan untuk Metode Ackers & Thompson menghasilkan nilai 0,858. Hasil perhitungan feasibility study menunjukkan bahwa flushing yang dilakukan Waduk Mrica pada tahun tertinjau belum dapat dikategorikan layak dikarenakan kriteria Sediment Balance Ratio with Full Drawdown tidak terpenuhi. Penelusuran waduk menunjukkan bahwa adanya konsistensi nilai head loss coefficient dengan range nilai 3,98 sampai dengan 4,14 pada penggelontoran sedimen di Waduk Mrica. Sehingga dapat disimpulkan bahwa flushing dapat mencapai feasible dan efektif bila dilakukan pada saat inflow mulai naik, durasi melebihi 13 jam, dan debit flushing mencapai 280 m3/s.

ANALISIS VARIABILITAS SPASIAL DAN TEMPORAL CURAH HUJAN DI WILAYAH GUNUNG MERAPI Dewi Ayu Sofia; Joko Sujono; Djoko Legono
TEKNISIA Vol. XXIII, No. 1, Mei 2018
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Rainfall intensity is one of the main trigger factors of cold lava flow on the active volcano slope, such as Mount Merapi. In the event of cold lava flood, where the rainfall as the trigger, there is a process of transformation of rainfall into the flow. Therefore, it is necessary to analyze the characteristics of rainfall, such as variability in terms of space (spatial) and time (temporal). This is important because of Indonesia is passed by the equator, so the rainfall variability is very high. This paper will analyze the spatial and temporal variability of rainfall in the area of Mount Merapi. Rainfall spatial variability was mapped based on the results of interpolation of the maximum rainfall data by Inverse Distance Weight (IDW) method, while the temporal variability was analyzed based on the average rainfall data distribution or maximum annual rainfall of each duration by unisolated event method. The results showed that the average rainfall or maximum rainfall for duration of 1 hour - 8 hours mostly occurred in the daylight until afternoon, between the hours of 13:00 to 17:00 with the incidence of heavy rain occurred in a short duration that is on the duration of 1 hour, 2 hours , 3 hours and 4 hours. Spatial mapping results show similar pattern of distribution where the maximum rainfall position is located in the west side of Mount Merapi.

REHABILITASI SALURAN TARUM BARAT TERKAIT TATA RUANG WILAYAH JABODETABEK Made Sumiarsih; Djoko Legono; Robert Kodoatie
Eco Rekayasa: Jurnal Teknik Sipil Vol. 11. No.1, Maret 2015
Publisher : Universitas Muhammadiyah Surakarta

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West Tarum Canal (WTC) is a canal to convey water for irrigation to the surroundings area and for distributing raw water to Jakarta area. The total length of WTC is 69.8 miles, starting from the Curug weir to the Ciliwung River. WTC has been operated for 40 years. Recently, there has been a decline in function of this canal up to 70%. For that reason, this canal is required rehabilitation to restore it function. This paper highlights the planning and implementation of the rehabilitation work related to spatial planning of Jabodetabekpunjur.

Effek Tegangan Geser dan Keseragaman Butiran terhadap Tebal Armour Layer pada Kondisi Statis di Dasar Saluran Cahyono Ikhsan; Adam Pamudji Raharjo; Djoko Legono; Bambang Agus Kironoto
Jurnal Teknik Sipil Vol 27 No 3 (2020)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2020.27.3.6

Pembentukan struktur surface selama degradasi dipengaruhi secara langsung oleh gerakan bedload yang terangkut dan grain size. Studi tentang degradasi dasar saluran ternyata mampu mengidentifikasi fluktuasi aliran, baik dalam kondisi fasa aliran rendah maupun dalam kondisi setelah terjadinya fase aliran banjir. Kondisi tersebut sangat mempengaruhi stabilitas dasar yang berdampak pada terbentuknya struktur surface untuk sedimen yang tetap tinggal dan bertahan, sedangkan sedimen yang relatif halus akan terangkut. Pada percobaan ini menggunakan flume segi empat dengan ukuran geometrik penampangnya adalah panjang 10 m, lebar 0,6 m dan kedalaman 0.45 m, sedimen dasar disebar dengan ketebalan 150 mm di dasar saluran. Material berupa pasir dan gravel dicampur merata, pada 5 variasi grain size dengan 2 fase pada tiap running yaitu fase eroded surface dan fase equilibrium. Instrumen yang digunakan berupa digital currentmeter, point gauge, sediment traps, pada kemiringan dasar saluran 1% sampai dengan 2,6% dan kapasitas debit 25 l/s sampai dengan 45 l/s. Hasil penelitian menunjukkan bahwa pembentukan armour layer terjadi bila sedimen yang terangkut sudah mencapai maksimal, selanjutnya berkurang secara bertahap sampai mendekati nol, maka sedimen yang tertinggal di permukaan terlihat menonjol dengan ukuran diameter butiran hampir seragam. Struktur armour layer yang menonjol menyebabkan terjadinya flow resistance sehingga mempengaruhi terbentuknya ruang kosong antar butir armour. Tebal armour layer dinyatakan dalam bilangan tak berdimensi dengan batasan nilai diameter bedload 0,8 mm sampai dengan 2,9 mm; koefisien uniformity 2,5 sampai dengan 5; tegangan geser kritik 0,61 N/m2 sampai dengan 2,7 N/m2 dan tegangan geser dasar minimal 6 N/m2.

Dividing Streamline Formation Channel Confluences by Physical Modeling Minarni Nur Trilita; Nadjadji Anwar; Djoko Legono; Basuki Widodo
IPTEK The Journal for Technology and Science Vol 21, No 1 (2010)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v21i1.23

Confluence channels are often found in open channel network system and is the most important element. The incoming flow from the branch channel to the main cause various forms and cause vortex flow. Phenomenon can cause erosion of the side wall of the channel, the bed channel scour and sedimentation in the downstream confluence channel. To control these problems needed research into the current width of the branch channel. The incoming flow from the branch channel to the main channel flow bounded by a line distributors (dividing streamline). In this paper, the wide dividing streamline observed in the laboratory using a physical model of two open channels, a square that formed an angle of 30º. Observations were made with a variety of flow coming from each channel. The results obtained in the laboratory observation that the width of dividing streamline flow is influenced by the discharge ratio between the channel branch with the main channel. While the results of a comparison with previous studies showing that the observation in the laboratory is smaller than the results of previous research.

EVACUATION ROUTE MAPPING AGAINST SLAMET VOLCANO DISASTER AT GUNUNGSARI VILLAGE, PULOSARI SUB DISTRICT, PEMALANG DISTRICT Misdiyanto Misdiyanto; Djoko Legono; Subagyo Pramumijoyo
Journal of the Civil Engineering Forum VOLUME: XXIII/1 - JANUARY 2014
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Villages inside the hazard zone of Slamet Volcano should have an evacuation map, as an anticipation and guidance to guide people evacuate when volcanic activity on the area arise to dangerous level. The experience which occurred at 2009 and 2010 indicate the necessity of the development of evacuation map for 7 villages inside the hazard zone in the Pemalang residential district, such as village of Gunung Sari. The main purpose of the developing an evacuation map is to make the village of Gunung sari becoming more vigilant to anticipate the danger of Slamet Mount eruption. Qualitative methods were used in this study, by handing out preliminary questionnaire to investigate the characteristic of the residents. The development of evacuation map also relies on the participation of the residents, then the resulted map were evaluated by assessing how far people can understand and comprehend any information provided on the map. The result of the investigation shows that Gunungsari’s resident wants an evacuation map, shown by high enthusiasm on the questions of the necessity of an evacuation map and disaster preparedness team that is equal to 97% of the residents on Dusun Sipendil, 83% on dusun Sibedil, 67% on Dusun Silegok, and 63% on Dusun Krajan. The residents also understand and comprehend the information provided on the map nicely, especially about the timing and rendezvous location for the evacuation. It is indicated by high proportion of residents that answer the questions asked accurately, which is 100% on Dusun Sipendil, 97% on Dusun Sibedil, and 80% for both Dusun Silegok and Dusun Krajan.Keywords: disaster prone area, evacuation map, society characteristic

Multi-Disaster Risk Analysis of Klaten Regency, Central Java, Indonesia Candra Dian Lukita Tauhid; Teuku Faisal Fathani; Djoko Legono
Journal of the Civil Engineering Forum Vol. 3 No. 3 (September 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Klaten Regency is located in Central Java Province, Indonesia, ranked as 19th most susceptible area in Indonesia. Among of many disasters those take place in Klaten are floods, landslides, and earthquake, which cause damages and loss of lives. Unfortunately, some areas in Klaten Regency are also very vulnerable to the disasters that often contribute severe damage and loss. This paper presents result of risk analysis due to floods, landslides and earthquake disaster at Klaten Regency. Several parameters or criteria are utilized to describe the level of the disaster intensities. The flood susceptibility parameters are the Topographic Wet Index (TWI), Normalized Difference Vegetation Index (NDVI), permeability and roughness, as proposed by Kafira, et al. (2015). The landslide susceptibility are the geology, slope, elevation, distance from fault, distance from rivers, rainfall and land use, as suggested by Thearith (2009) whereas the earthquake susceptibility was referred to FEMA P-154 by using the Ss and S1. The vulnerability and risk analysis are carried out by referring to the parameters as stipulated by the Chief Regulation of the National Board of Disaster Management No.2 Year 2012 (Perka Badan Nasional Penanggulangan Bencana- BNPB), concerning the parameters being used for the vulnerability analysis, i.e. population density, poverty ratio, land use, and level of Gross Regional Domestic Product. Further spatial analysis of the risk performs the multi-disaster risk map as a combination between the floods, landslides and earthquake disaster risk in Klaten Regency. The established multi-disaster risk map shows the risk level in the Klaten Regency, i.e., 16.31% at very low risk, 33.01% at low risk, 34.49% at medium risk, at 14.22% high risk and 1.97% at very high risk.

Laboratory Study on Comparison of the Scour Depth and Scour Length of Groundsill with the Opening and Groundsill without the Opening Ani Hairani; Djoko Legono
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

River bed control structure what so called groundsill or bottom sill is built for controlling a river bed to remain stable against degradation. Unlike other river obstacles, the presence of groundsill might cause sediment retention upstream of the structure; hence it reduces the supply of sediment to the downstream part of the river. At some extent, the above situation might create unexpected negative impact, not only cease the sediment migration but also disable fish migration, as well as the utilization of river for navigation. This paper presents the hydraulic investigation on various models of groundsill, i.e. groundsill without the opening and groundsill with a certain type of the opening. Series of laboratory experiments were conducted on an open channel flow of 0.75m width and longitudinal slope of 0.05%. There were two types of groundsill, i.e. groundsill without the opening with 0.75m width and 0.05m height, and groundsill with the opening of 0.39m width and 0.005m height of crest at the opening and 0.05m at the wings. Various flow rates were then introduced, necessary data were taken, and the hydraulic phenomena were studied. The results showed that groundsill without the opening produced non-dimensional (relative to the channel width) scour depth of 0.036, and scour length of 0.253. Groundsill with the opening produced scour depth of 0.013 and 0.024 near the downstream end of the wing section and the opening respectively. The scour length of the groundsill with the opening is 0.080 and 0.293 near the downstream end of the wing section and the opening section respectively. Moreover, it can be noted that the presence of the scour depth and scour length of the groundsill with the opening was generally much smaller rather than that of groundsill without the opening. The above results give the evidence that groundsill with the opening is much friendlier and also more suitable for the environment needs.Keywords: control structure, environmentally sound, groundsill, hydraulic phenomenon

Co-Authors Adam Pamudji Rahardjo Adam Pamudji Rahardjo Adam Pamudji Rahardjo Adam Pamudji Raharjo Agatha Padma Laksitaningtyas Agatha Padma Laksitaningtyas Agatha Padma Laksitaningtyas, Agatha Padma Ahad Legiarto Ali Rahmat Ani Hairani Ani Hairani Asril Zevri Bambang Agus Kironoto Bambang Agus Kironoto Bambang Triatmodjo Bambang Yulistiyanto Bambang Yulistiyanto Bambang Yulistiyanto Bambang Yulistiyanto Basuki Widodo Bella Koes Paulina Cantik Budi Santosa Budi Santosa Budi Wignyosukarto Cahyono Ikhsan Candra Dian Lukita Tauhid Cantik, Bella Koes Paulina Davianto Frangky B. Welkis Denik Sri Krisnayanti Dewi Ayu Sofia Dyah Ari Wulandari Eka Laily Ramadhani Elenora Gita Alamanda Sapan Endita Prima Ari Pratiwi Fatchan Nurrochmad Fauziyah, Risky Fery Moun Hepy Fitriana, Indri Rahmandhani Hanny Hafiar Haryono Haryono Haryono Kusumosubroto Heriantono Waluyadi Ikhsan, Cahyono Istiarto Istiarto Istiarto Istiarto Istiqomah, Nurul Alvia John H. Frans John Hendrik Frans Joko Sujono Kazuhiko Otani Kironoto, Bambang Agus Kisindi Nur Afifah Made Sumiarsih Made Sumiarsih Misdiyanto Misdiyanto Miskar Maini Nadjadji Anwar Ni Made Sumiarsih Ni Nyoman Nepi Marleni Nur Ariva Sabila Nur Ikawati Rachmad Jayadi Radianta Triadmadja Rahardjo, Adam Pamudji Rahardjo, Adam Pramudji Raharjo, Adam Pamudji Ramon Putra Robert J. Kodoatie Robert Kodoatie Robert Kodoatie, Robert Roby Hambali Seran, Yustinus A. Subagyo Pramumijoyo Suharyanto Suharyanto Sumiadi, Sumiadi Sunjoto Sunjoto Suseno Darsono Suseno Darsono SYAHRANI SYAHRANI Teuku Faisal Fathani Umar Fauzan Utomo, Bagus Prio Wilhelmus Bunganaen Wilhelmus Bunganaen Yustinus Akito Seran

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