Articles
<![CDATA[RIVER CLIFF REINFORCEMENT EFFORTS BY APPLICATION OF COMBINATION OF DAM STONE, GABION, TETRAPOD, AND BAMBOO FLOW ALIGNER ]]>
<![CDATA[Wibowo, Dian Eksana]]>;
<![CDATA[Purwantoro, Didik]]>;
<![CDATA[Nayono, Satoto Endar]]>;
<![CDATA[Wardhana, Indra Bayu]]>;
<![CDATA[Prabowo, Yoga Bayu]]>
<![CDATA[ Journal of Green Science and Technology Vol 4, No 1 (2020): Journal of Green Science and Technology, Vol.4 No.1 (2020) ]]>
Publisher : <![CDATA[FAKULTAS TEKNNIK UNIVERSITAS SWADAYA GUNUNG JATI ]]>
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DOI: 10.33603/jgst.v4i1.3152
<![CDATA[The purpose of research : (1) determine the ratio between the combination of retrofitting tetrapod-bamboo alignment-tetrapod (FP1); bamboo flow aligner-tetrapod-bamboo flow aligner (FP2); Check Dam Stones-Gabion-Check Dam Stones (FP3); Gabion-Check Dam Stones-Gabion (FP4)? (2) The effectiveness of the combination of strengthening the tetrapod-bamboo aligner-tetrapod (FP1); bamboo flow aligner-tetrapod-bamboo flow aligner (FP2); Check Dam Stones-Gabion-Check Dam Stones (FP3); Gabion-Check Dam Stones-Gabion (FP4)?Using the experimental method by creating a Labolatorium scale river model. Testing using clay and sand. The test model is a cliff without reinforcement and cliff with a combination of reinforcement between tetrapods; bamboo flow aligner; check Dam stones and Gabions. Testing by flowing water for 180 minutes/3 hours with a constant discharge of 7.07 liters/second, the installation of reinforcement is 51 cm apart.The results showed that (1) In general, the effect of the FP1 reinforcement installation was the variation of the combination that was considered the best in reducing scouring on the cliffs and riverbeds. (2) Variation of the combination of FP1, is more effective in reducing the scouring that occurs. At the beginning of the channel turns from STA 00-06 effectively used tetrapod installation, with scours that occur as big as -5 cm, in the middle of the STA channel 06-16 effectively using the installation of bamboo flow aligner, scours that occur as much as -1.5 cm, whereas at At the end of the turn, STA 17-24 used tetrapod installation, scouring by -3.8cm.Keyword: scouring, bamboo flow aligner, tetrapod.]]>
<![CDATA[Simulasi Model Matematik Difraksi Gelombang dengan Metode Elemen Hingga ]]>
<![CDATA[Didik Purwantoro]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 3, No 2 (2007): Agustus ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v3i2.8327
<![CDATA[This paper presents results of research in mathematical model for solving mild slope equation using finite element method. In this method the model in differential equation is approximated with Galerkin smethod and then the equation formed is solved with job iteration.. The equation of refraction and diffraction can be formulated as Mild Slope equation which is assumed that the depth is constant. The result of his research indicates that mathematical model using finite element method give a good perfomance.]]>
<![CDATA[Pengaruh Penempatan Tirai Segitiga Lurus dan Segitiga Lengkung terhadap Kedalaman Gerusan Lokal ]]>
<![CDATA[Muchtar Agus Tri Windarta]]>;
<![CDATA[Didik Purwantoro]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 12, No 2 (2016): Desember ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v12i2.12591
<![CDATA[ABSTRACT Pier is part of the bridge which is the most important because it serves to hold the weight of bridge and the weight of the charge passing through it. Then development on the pier of the bridge particularly on stability against local scouring due to the influence of the flow of river water to note. This test aims to find out the influence of variations in the placement of the curtains triangle straight and curved triangle. This study using models pier observation as a means of testing with parameters of depth of flow and discharge of water, with a height of 10 cm, the sand discharge flow 1.09 l/sec. The test Objects this uses pipe PVC with a diameter of 2,6 cm high pier, 25 cm as the pier for testing. Testing it uses a standard tilting flume. Testing done twice with the variation form of the curtain striangle straight and curved triangle. Based on the results of testing conclusion can be obtained that depth of scouring at point A on the pier using a variation of the curtain triangle straight can reduce the scouring of 70% while in the triangular curve blinds reduce scouring amounted to 66%, the depth of scouring in point B and D on the pier using a variation of the curtain triangle straight can reduce the scouring amounting to 72% while in the triangular arch blinds reduce the scouring amounting to 51%, and depth of scouring in point C on the pier using a variation of the triangle straight curtain can reduce scouring of 88% while in the triangle blinds arch reduce the scouring of 66%. Keywords: depth of scouring, variety of curtains. ABSTRAK Pilar merupakan bagian dari jembatan yang paling penting karena berfungsi untuk menahan berat badan jembatan itu sendiri dan berat muatan yang melintasinya. Maka pembangunan pada pilar jembatan terutama pada kestabilan terhadap gerusan lokal akibat pengaruh aliran air sungai perlu diperhatikan. Pengujian ini bertujuan untuk mengetahui pengaruh variasi penempatan tirai segitiga lurus dan segitiga lengkung. Kajian ini menggunakan model pilar sebagai alat pengamatan pengujian dengan parameter kedalaman aliran dan debit air sama, dengan ketinggian pasir 10 cm, debit aliran 0.99 lt/det. Benda uji ini menggunakan pipa PVC dengan diameter 2,6 cm, tinggi pilar 25 cm sebagai model pilar untuk pengujian. Pengujian ini menggunakan standard tilting flume. Pengujian dilakukan dua kali dengan variasi bentuk tirai segitiga lurus dan segitiga lengkung.Berdasarkan hasil pengujian dapat diperoleh kesimpulan bahwa kedalaman gerusan di titik A pada pilar yang menggunakan variasi tirai segitiga lurus dapat mengurangi gerusan sebesar 70% sedangkan pada tirai segitiga lengkung mengurangi gerusan sebesar 66%, kedalaman gerusan di titik B dan D pada pilar yang menggunakan variasi tirai segitiga lurus dapat mengurangi gerusan sebesar 72% sedangkan pada tirai segitiga lengkung mengurangi gerusan sebesar 51%, dan kedalaman gerusan di titik C pada pilar yang menggunakan variasi tirai segitiga lurus dapat mengurangi gerusan sebesar 88% sedangkan pada tirai segitiga lengkung mengurangi gerusan sebesar 66%.Kata kunci: kedalaman gerusan, variasi tirai.]]>
<![CDATA[DIFRAKSI GELOMBANG PADA SILINDER 8ESAR DENGAN MILD SLOPE EQUATION ]]>
<![CDATA[Didik Purwantoro]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 2, No 2 (2006): September ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v2i2.8315
<![CDATA[ABSTRACTThis research is aimed to know the process of wave diffractionaround the large cylinder of offshore structure using finite elementmethod. This model chosen because of some reasons, i.e thecomplication of offshore structure's shape which are caused difficultiesto conduct physical model solving. The other excess of this numericalmodel is cheaper and easier than physical model conducted in thelaboratorium.The equation of wave diffraction can be formulated as Helmholtzequation. A second approach can be developed by Mild Slope Equation,which is assumed that the depth is constant. The Helmholtz equationwas done using finite element method with linear triangle interpolation.With finite element method, the complicated domain area can be solvedmore easily and effectively.The result shows that the use of finite element method is stilladequate to solve Helmholtz equation' for period 8, 9 and 10 second.For period of 8 second numerical error produce the wave heightdifference of 0,36 m. The numerical model is then easily edited toanalyze another offshore structures.Keywords: diffraction, cyllinder, finite element]]>
<![CDATA[ANALISIS JARINGAN PIPA DISTRIBUSI AIR BERSIH PADA DAERAH PEMUKIMAN MENGGUNAKAN PROGRAM WATERCAD ]]>
<![CDATA[Didik Purwantoro DAN Sinta Aristy M. Mori]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 1, No 2 (2005): September ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v1i2.8241
<![CDATA[ABSTRACTThis research is aimed to show the ability of tube tissue system distributesclean water in Balikpapan City recently. The use of waterCAD software is one ofthe alternative programs to drive an element tube exchange to get a betterclean water distribution tissue.The data of the research are city population, topography photograph,skeletonize-model map and its equipment. The data then were used for the inputof waterCAD software. According to the output of the program, it shows that itshould be a change of tube elements to gain pressure standard 150-300 kPausing scenario management facility.The result analysis using waterCAD software shows that the capacity ofclean water distribution pipe at this time have not been able to suffice the cleanwater demand, in this condition, the water flow has average pressure -29.735,05kPa which is not appropriate with pressure standard. The alternative program tosolve this matter is the change of tube diameter to 400, 500, and 600 mm andtube material from Galvanized Iron and Steel. The pressure after the change is174,5 kPa. The computation dispute between waterCAD software and analyticcomputation is 0,71% for flow debit and 2,27% for pressure at node. The differenceshows that the waterCAD software has been thoroughly tested.Keywords: water demand, clean water distribution system, waterCAD program]]>
<![CDATA[PENGARUH VARIASI DEBIT ALIRAN TERHADAP GERUSAN MAKSIMAL DI BANGUNAN JEMBATAN DENGAN MENGGUNAKAN PROGRAM HEC-RAS ]]>
<![CDATA[Ichsanul Barokah, Didik Purwantoro]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 10, No 2 (2014): Desember ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v10i2.9965
<![CDATA[This research aims to find The maximum scour depth occurred in building bridges using HEC -RAS software . Maximum scour modeling results can be used to identify and estimate thestability of the structure of the bridge. This research using software HEC-RAS v. 4.1.0. Stagesof modeling programming includes several data input process, that is: the geometry data inputstream, bridge geometry data input, input the data flow, data input on bridge scour. Modeling isdone with the flow rate changes on any one process is running. Modelling maximum scour whoreviewed that is on the pillars of the bridge. This research result of this modeling with the flowrate variation, it can be seen that the discharge 5.87 m³ / s to 905.23 m³ / s began to increasethe depth of scour at the pillars. Then on debit 905.23 m³ / s to 1080.15 m³ / s scour depthexperience stability pillar, at a depth of 1.76 m..Keyword: HEC-RAS, Scour, The flow rate]]>
<![CDATA[MODEL MATEMATIK ANGKUTAN LIMBAH PADA SALURAN TERBUKA ]]>
<![CDATA[Didik Purwantoro]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 2, No 1 (2006): Maret ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v2i1.8306
<![CDATA[This research is aimed to know the process of waste transportation on theopen-channel using numerical model. This model is chosen because of some reasons, for example the complication of the river tissue, the influence of ebb which causes difficulty to conduct analytical problem solving. The other excess of this numerical model is cheaper and easier than conducting measurement of waste rate in the field.The equa~on of waste transportation can be formulated as the two physics phenomenon, Le. advection and diffusion process or long dispersion of river. In the solving of equation of waste transportation, each of the components was analyzed separately. The advection part was done first, and the diffusion part was finished then. The advection equation was done using Lagrange interpolation, and the diffusion equation was done using differential method to explicit scheme.The result of the research shows that the use of Lagrange interpolation upto order 4 is still be good enough to finish advection equation for numberCourant 1, 0,75 and 0,5. For number Courant 0.25, numerical mistake causingconcentration degradation of 2.3 0/0. In the diffusion equation, the result of computationusing differential method up to explicit scheme yielding degradation ofwaste concentration from 10 gr/I become 4,96 gr/I for the diffusion coefficient ofKx =10 m2/sc and become 3,73 gr/I for the diffusion coefficient of Kx = 20 m2/sc.]]>
<![CDATA[MODEL PENGENDALIAN GERUSAN DI SEKITAR ABUTMEN DENGAN PEMASANGAN GROUNDSILL DAN ABUTMEN BERSAYAP ]]>
<![CDATA[Didik Purwantoro]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 11, No 1 (2015): Mei ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v11i1.9950
<![CDATA[ABSTRACTThe main aim of this research is to get a control of scouring around the abutmen of bridge. Scouraround the abutments must be controlled because it is the main damage cause of abutments andthe hydraulic structures built in the river bed. This research was carried out using expermentalmethod by standart teaching flume and steady-uniform flow in Hydraulic Laboratory CivilDepartment Yogyakarta State University.. The research is done in clear-water-Scour The abutmentmodel were spillthrough type, wing-wall type, triangular type and semi circular type.The researchresult shows that the good performance of maximum scour depth around the abutment ocurred atwingwall abutment for 4b lenght is equal to 11 cm.Keywords : Scouring, Groundsill, Wingwall abutment]]>
<![CDATA[PENGELOLAAN SISTEM DRAINASE KAMPUS UNYKARANGMALANG MENUJU KEMANDIRIANSUMBER AIR BERSIH ]]>
<![CDATA[Didik Purwantoro Sumardjo H, Rifta AP, Dwi Yulianto]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 8, No 1 (2012): Mei ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v8i1.3699
<![CDATA[This research was meant to find out Capability of a system campusdrainage area at Universitas Negeri Yogyakarta, Karangmalang. Karangmalangbecomes very strategic because of An influence on the flooding during the rainSubsidence groundwater as a source of clean water in the summer. The colomboarea that is part of the campus Universitas Negeri Yogyakarta (the gate of UNY), aslong as it has been known as a flood-prone area. This research was conducted withsurvey approaches in the field for 4 months. The fist step, evaluation dischargeoccurring due to rain in kawasan UNY campus. The second evaluation of drainagechannels in the drain the ability of surface water with the rational method. The testresult showed that the drainage system Was not able to fulfill a discharge of waterthat occurs with 55,77mm/jam or Rain reëxamined high by period of 10 years. Butwhen most of the rain water (from roof) Distributed into infiltration well, therefore theneed of infiltration well as 388 pieces????Keyword: drainage, Universitas Negeri Yogyakarta]]>
<![CDATA[PENGGUNAAN SUMUR RESAPAN UNTUK MENGURANGI GENANGAN AIR HUJAN DI KAMPUS KARANGMALANG UNIVERSITAS NEGERI YOGYAKARTA ]]>
<![CDATA[Lutjito, Sudiyono AD, Didik Purwantoro]]>
<![CDATA[ Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 11, No 1 (2015): Mei ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/inersia.v11i1.9944
<![CDATA[ABSTRACTThe objectives of this studywas to solve the problem of floodwater due to the rainwater runoffand to reduce the flow rate of the runoff at the Colombo Street in front of the Faculty of SportScience, Yogyakarta State University (YSU). This study was conducted based on the existingprimary and secondary data. The data analysis to get the rainfall intensity was conducted usingthe analytical method that obtain the values of the standard deviation, the mean, the coefficientof variation, the asymmetry and kurtosis. From these values, it was obtained the types ofeligible distribution after going through the test to get the maximum rainfall in the period of 2years, 5 years, 10 years, 20 years and 25 years. Based on the data, the arch intensity wasexamined. The analysis showed if20% of YSU area is occupied by infiltration wells or if thereare 250 infiltration wells in which 1 infiltration well is used for the area of 350 m2, the need ofinfiltration wells will be covered and it is going to reduce the flow rate of the runoff in 0.552 m3/s.This is consistent with the concept of sustainable rainwater drainage system based on theconservation of ground Water. Essentially,it is a drainage system in which the rainwater fallingon the roof/pavement, is accommodated in a system of water absorption among othersinfiltration Wells therefore it will reduce the the floodwater runoff at the Colombo street. Anotherbenefit isthe infiltration wells will also increase the ground water level.Keywords: Rate of Flow, Infiltration Well, Rain Water]]>
