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MODEL PREDIKSI KELELAHAN PEKERJA KONSTRUKSI DI LOKASI PROYEK Winanda, Lila Ayu Ratna; Adi, Trijoko Wahyu; Anwar, Nadjadji
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 21, No. 2, Juli 2017
Publisher : Department of Civil Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.691 KB) | DOI: 10.24843/JITS.2018.v21.i02.p03

Abstract

Konstruksi merupakan kegiatan dinamis dengan waktu dan jadwal tertentu sehingga dalam perencanaan sumber daya manusia harus disusun secara efektif. Konsekuensi hal ini adalah jadwal kerja yang padat dan dapat menyebabkan kelelahan pada pekerja konstruksi. Kelelahan pekerja konstruksi merupakan sebuah proses yang dapat berubah seiring waktu. Kelelahan dapat dideteksi berdasarkan faktor-faktor yang mempengaruhinya dimana satu sama lain mungkin saling berkaitan. Untuk itu, salah satu metode yang dapat digunakan dalam pemecahan masalah kelelahan pekerja konstruksi adalah pendekatan sistem dinamik. Metode yang dilakukan dalam kajian ini mengikuti langkah pendekatan model pada sistem dinamik. Tahapan dalam analisis sistem dinamik diawali dengan identifikasi dan konseptualisasi sistem berdasarkan variabel kelelahan pekerja, kemudian dilakukan identifikasi interaksi variabel menggunakan diagram sebab akibat (causatic diagram) dan diagram anak panah (stock flow diagram). Dalam analisis ini digunakan alat bantu software vensim. Berdasarkan hasil kajian, diperoleh sebuah model prediksi kelelahan pekerja konstruksi yang telah terverifikasi dan tervalidasi melalui formulasi yang dirumuskan. Skenariosasi pada model kelelahan pekerja konstruksi menunjukkan bahwa semakin kompleks variabel yang berpengaruh dalam sistem maka perubahan tingkat kelelahan yang terjadi pada pekerja juga semakin signifikan. Kata kunci: Kelelahan, Pekerja konstruksi, Sistem dinamik
STUDI EROS. DAN CIR H.DROLIKA ALiRAN DIPt:RMUKAAN LAHAN (Erosion Study and Hydroulic Row on Land Surface) MT., Ir. Siswanto; Anwar, Nadjadji
MAPETA Vol 4, No 13 (2002): MAPETA
Publisher : MAPETA

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Abstract

The purposed of the study is to identify of characteristics hydraulic flow and erosion as real picture on incipient motion-m sediment transport. The study is conducted in types of soil namely Alfisol and Entisol. They have a wide range utilization and a high erosion susceptibility. Simulation has been conducted by dropping eight different rain height to undisturbed soil block samples with 2.500 square em, width and 10 em thickness and with 9 % and 17 % land slopes. The results shows that surface run off not play in detachment of soil particle if equal with rain pellet and dispersion of water, but its transport sediment. Surface run off on plot standard in two kind of soil (Alfisol and Entisol) is laminar sub critics with Reynold number 140,2 and 136,2; Froude Number 0,940 and 0,980; drag force 9,02 and 4,44 Nm-2. Whereas 17% slope is super critics with Reynolrd Number 206,2 and 78,1; Froude number 1,219 and 1,286 and drag force 14,79 and 9,76 Nm-2.· Key Words: Erosion, hydraulic characteristic, sediment transport
PENENTUAN NILAI KONDUKTIVITAS HIDROLIK TANAH TIDAK JENUH MENGGUNAKAN UJI RESISTIVITAS DI LABORATORIUM Asmaranto, Runi; Aryani Soemitro, Ria Asih; Anwar, Nadjadji
Jurnal Teknik Pengairan Vol 3, No 1 (2012)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Abstract

Electrical resistivity can be used to identify geotechnical parameters such as water content, liquid limit, plastic limit and unit weight. It is known that the hydraulic conductivity values can be predicted based on soil properties, so that should be determined through resistivity laboratory test. Some researchers explained that unsaturated soil hydraulic conductivity correlated with soil-water characteristic curve (SWCC), thus the estimated values of hydraulic conductivity using a resistivity test is very important to be developed by observing the behavior of the soil.This study examines changes in hydraulic conductivity of unsaturated soil based on laboratory resistivity test. The results are compared with Gardner (1958) and Campbel (1973) empirical methods. The results show that the unsaturated soil hydraulic conductivity correlates well with the empirical methods used.Keywords: soil-water characteristic curve, hydraulic conductivity, unsaturated soil, suction
ANALISIS KESIAPAN MODERNISASI IRIGASI PADA DAERAH IRIGASI KEWENANGAN PEMERINTAH PROVINSI DI KABUPATEN MOJOKERTO Sari, Dian Puspita; Anwar, Nadjadji; Sidharti, Theresia Sri
Jurnal Irigasi Vol 14, No 1 (2019): Jurnal Irigasi
Publisher : Balai Penelitian dan Pengembangan Irigasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (552.006 KB) | DOI: 10.31028/ji.v14.i1.33-45

Abstract

Dalam melaksanakan pengelolaan sistem irigasi pada daerah irigasi kewenangan pemerintah Provinsi Jawa Timur di Kabupaten Mojokerto, Dinas PU Sumber Daya Air Provinsi Jawa Timur mengalami beberapa kendala yaitu jaringan irigasi telah habis umur teknisnya, kurang optimalnya pelayanan irigasi serta terjadinya penurunan kapasitas tampungan air yang ada. Kendala lainnya yaitu adanya pertumbuhan penduduk yang menyebabkan peningkatan kebutuhan penggunaan air, peningkatan kebutuhan pangan, alih fungsi lahan pertanian menjadi pemukiman maupun industri serta Daerah Aliran Sungai kritis. Sebagai upaya untuk mengatasi kendala tersebut, selain operasi, pemeliharaan dan rehabilitasi, diperlukan suatu pembaharuan secara menyeluruh, baik manajerial, institusional maupun teknikal, termasuk sumber daya manusianya, yang dikenal dengan istilah modernisasi irigasi. Sebelum melaksanakan kegiatan modernisasi irigasi, perlu adanya suatu penilaian untuk mengukur tingat kesiapan suatu daerah irigasi dalam melaksanakan kegiatan modernisasi irigasi tersebut. Langkah pertama yaitu menentukan kriteria yang mempengaruhi modernisasi irigasi, dalam hal ini terdapat 5 kriteria dan 34 sub kriteria. Penentuan bobot kriteria dilakukan dengan metode Fuzzy Analytical Hierarchy Process. Kemudian setelah itu, skala prioritas kesiapan daerah irigasi dalam melaksanakan kegiatan modernisasi irigasi ditentukan dengan metode Simple Additive Weighting. Dari 7 daerah irigasi kewenangan pemerintah provinsi Jawa Timur yang ada di Kabupaten Mojokerto, didapatkan skala prioritas bahwa modernisasi irigasi dapat diterapkan pada DI Kromong. Modernisasi irigasi perlu ditunda untuk dilakukan penyempurnaan terlebih dahulu pada DI Mernung, DI Sinoman, DI Penewon, DI Candi Limo, DI Jatikulon, dan DI Subontoro.
APLIKASI METODE CURVE NUMBER UNTUK MEMPRESENTASIKAN HUBUNGAN CURAH HUJAN DAN ALIRAN PERMUKAAN DI DAS CILIWUNG HULU – JAWA BARAT Tikno, Sunu; Hariyanto, Teguh; Anwar, Nadjadji; Karsidi, Asep; Aldrian, Edvin
Jurnal Teknologi Lingkungan Vol 13, No 1 (2012)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1149.735 KB) | DOI: 10.29122/jtl.v13i1.1402

Abstract

Aliran permukaan/limpasan (run off) merupakan salah satu variabel hidrologi yang sangat penting di dalam menunjang kegiatan pengembangan sumber daya air. Metode prediksi yang handal untuk menghitung jumlah dan laju limpasan yang berasal dari permukaan tanah dan bergerak menuju sungai di suatu DAS yang tidak dilengkapi alat ukur (ungaged watershed) adalah suatu pekerjaan yang sangat sulit dan memerlukanwaktu yang banyak. Penelitian ini dilakukan di DAS Ciliwung Hulu, yang merupakan daerah penting dalam kotribusi banjir di Jakarta. Untuk mengetahaui run off  yang terjadi, digunakan data curah hujan dan debit Tahun 2007-2009. Sebagai model, untuk mengetahui run off menggunakan peta penggunaan lahan, peta jenis tanah, dan topografi. Peta-peta tersebut diolah dengan menggunakan Arcview, sehingga didapatkannilai CN. Berdasarkan analisis perhitungan, besarnya debit mendekati 50% dari tebal hujan. Kondisi ini mengindikasikan bahwa kondisi DAS Ciliwung Hulu sudah tidak mampu lagi menyerap curah hujan dengan baik. Korelasi antara hasil prediksi run off model yang menggunakan CN dengan perhitungan run off observasi cukup baik. Hal ini menunjukkan bahwa metode Curve Number cukup dapat mepresentaskan hubungancurah hujan dengan aliran permukaan (run off). kata kunci : Run off observasi, run off model, curve number AbstractRun off (surface flow) is one of the most important hydrological variable in supporting the activities of water resources development. A reliable prediction method to calculate the amount and rate of runoff from the land surface caused by the rain that falls in a watershed that is not equipped with measuring devices (un gauge watershed) is a verydifficult job and requires a lot of time. The research was conducted in the watershed Ciliwung Hulu, which is an important area in relation to the incidence of flooding in Jakarta. Curve Number (CN) method can be used to predict the amount of runoff from a watershed. This model required input of rainfall; land cover maps; soil type maps,and topography. The maps are processed using Arc View software, so we get the value of CN. In this study, we used of rainfall and discharge data 2007-2009. Based on the analysis of calculation, known that amount of surface flow approaching 50% of rainfall depth. This condition indicates that the Ciliwung Hulu watershed conditions were not ableand proper to absorb of rainfall. The correlation between the results of run-off prediction models using CN with run-off observation was quite good. This indicated that the Curve Number method could be able to represent the relationship of rainfall with surface flow (run off) and also to predict runoff key words: Run off observation, run-off model, curve number
IDENTIFIKASI RISIKO PADA KONTRAK BERBASIS KINERJA (KBK) PROYEK JALAN RAYA DI INDONESIA Wiguna, I Putu Artama; Anwar, Nadjadji; Tjendani, Hanie Teki
Simposium II UNIID 2017 Vol 2 (2017)
Publisher : Simposium II UNIID 2017

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Abstract

Kontrak Berbasis Kinerja (KBK) merupakan kontrak terintegrasi sebagai salah satu upaya pemerintah agar jalan raya selalu dalam kondisi mantap. Sebelumnya, pemeliharaan jalan dilakukan dengan kontrak konvensional dimana perencana, pelaksana pekerjaan konstruksi dan masa layanan pemeliharaan dilakukan oleh penyedia jasa yang berbeda. Sedangkan kontrak berbasis kinerja ini menyerahkan semua tanggung jawab tersebut pada satu penyedia jasa (kontraktor) dan dibayar secara lump sum sesuai kinerja yang dihasilkan. KBK mendorong penyedia jasa untuk menyediakan pekerjaan bermutu jika tidak ingin mengalami kerugian lebih besar pada masa layanan pemeliharaan. KBK telah digunakan di negara maju dan negara berkembang serta berhasil memberi manfaat bagi otoritas jalan berupa penghematan biaya pemeliharaan dan peningkatan kondisi aset jalan yang dikontrakkan. Pada dasarnya kontrak berbasis kinerja merupakan usaha penempatan risiko kepada pihak penyebab risiko. Pada kontrak konvensional, risiko tersebut menjadi beban pihak pemerintah. Penelitian ini bertujuan untuk identifikasi risiko-risiko pada tahap persiapan kontrak berbasis kinerja yaitu tahap prebidding, bidding serta tahap perencanaan konstruksi, tahap pelaksanaan konstruksi dan masa layanan pemeliharaan. Tahap prebidding dan bidding merupakan lingkup pekerjaan pemilik proyek (owner) sedangkan tahap selanjutnya yaitu tahap perencanaan, pelaksanaan dan masa layanan pemeliharaan merupakan lingkup pekerjaan penyedia jasa
Analysis of Waikelo Port Breakwater Failure through 2D Wave Model Winarta, Bambang; Damarnegara, A. A. N Satria; Anwar, Nadjadji; Juwono, Pitojo Tri
Civil and Environmental Science Journal Vol 1, No 2 (2018)
Publisher : Fakultas Teknik UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (924.315 KB) | DOI: 10.21776/ub.civense.2018.00102.6

Abstract

Waikelo Port is located in South West Sumba of East Nusa Tenggara. The port facilities are protected by breakwater with a vertical wall construction and it was built in a relatively deep ocean at -15m of Low Water Sea Level (LWS). On 21 of January 2012, an earthquake with magnitude of 6.3 Richter scale occurred around Sumba Island and it caused cracking in the concrete wall of breakwater. Then, 4 days after on 25 st January 2012, a heavy wind of 20–23 knots generated a high wave around 4.0–5.0m in Sumba strait. These high waves caused a critical damage on the west part of the breakwater. The damage of port facilities were getting worse when a storm called Lua hit on March 2012. This study was conducted to observe the effect of the extreme event in the failure of breakwater. The result of two-dimensional (2D) wave model shows that the wave heights in the area of breakwater are varied 3.80 to 4.0m. It is quite greater than the wave design of 50 years return period (= 2.00m) which was used in breakwater design and calculation. This observable fact confirms that the failure of breakwater was caused by the continuous extreme events that exceed the design criteria
DEVELOPING OF TOTAL SUSPENDED SEDIMENT MODEL USING LANDSAT-8 SATELLITE IMAGE AND IN-SITU DATA AT THE SURABAYA COAST, EAST JAVA, INDONESIA Hariyanto, Teguh; Krisna, Trismono C.; Khomsin, Khomsin; Pribadi, Cherie Bhekti; Anwar, Nadjadji
Indonesian Journal of Geography Vol 49, No 1 (2017): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (722.493 KB) | DOI: 10.22146/ijg.12010

Abstract

The decrease of coastal-water quality in the Surabaya coastal region can be recognized from the conceentration of Total Suspended Sediment(TSS ) . As a result we need a system for monitoring sediment concentration in the coastal region of Surabaya which regularly measures TSS. The principle to model and monitor TSSconcentration using remote sensing methods is by the integration of Landsat-8OLI satellites image processing using some ofTSS-models then those are analyzed for looking its suitability with TSS value direcly measured in the field ( in-situ measurement). The TSS value modeled from all algorithms validated usingcorrelation analysis and linear regression . The result shows that TSS model with the highest correlation value is TSS algorithm by Budiman (2004)with r value 0.991. Hence this algorithm can be used to investigate TSS-distribution which represent the coastal water quality of Surabaya with TSS value between 75 mg/L to 125 mg/L.
A STUDY OF SEDIMENT DELIVERY RATIO USING AVSWAT-X IN THE CATCHMENT AREA OF PACAL RESERVOIR OF BOJONEGORO Erwanto, Zulis; Anwar, Nadjadji; Sarwono, Bambang
Journal of Civil Engineering Vol 30, No 2 (2010)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1080.875 KB) | DOI: 10.12962/j20861206.v30i2.1722

Abstract

Recently, the flood intensity that brought by tributary rivers in the catchment area of Pacal reservoir has increased, both in the quantity of runoff and sediment volume. The research aims to set up erosion rate modeling and find the formulation of the Sediment Delivery Ratio (SDR) at Pacal reservoir. The research used USLE and MUSLE methods as comparator to find sediment yield accuracy at Pacal reservoir, by applying ArcView SWAT-X software. Total average annual erosion rate in the catchment area of Pacal reservoir which has area 82 Km2 calculated using USLE and MUSLE methods are 159,31 ton/ha/yr and 582 ton/ha/yr respectively. MUSLE method resulted SDR which is most closely to SDRobservation if it is compared to USLE method. In this research, MUSLE - Sediment-Discharge Rating Curve method has evaluation values MSE = 0,08; RMSE = 0,29; and Nash = 0,75. Furthermore, Sediment Delivery Ratio at catchment area of Pacal reservoir can be formulated as 0,29 3,83. DAS Waduk Pacal SDR A with value of SDRZulis = 0,27 and sediment yield obtained from MUSLE method equal to 157,40 ton/ha/yr, while from USLE method equal to 43,09 ton/ha/yr. Evaluate sediment yield of MUSLE from SDRZulis to formulation of SDR of former researcher was value of Nash = 0,89; MAE = 0,01. Based on the research result, it is expected that the institution which has responsibility in managing the catchment area of Pacal reservoir would pay high attention to zonation map of erosion risk level and can overcome sedimentation in Pacal reservoir.
APPRAISAL ANALYSIS OF IRRIGATION SYSTEM MANAGEMENT BASED ON SUSTAINABLE DEVELOPMENT CONCEPT IN TILONG IRRIGATION AREA OF KUPANG REGENCY Kini, Lidya; Anwar, Nadjadji; Sidharti, Theresia Sri
Journal of Civil Engineering Vol 29, No 2 (2009)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.839 KB) | DOI: 10.12962/j20861206.v29i2.1730

Abstract

The sustainable concept of irrigation system appraisal was based on Sustainable Development Concept with 3 components/pillars, Social, Economy and Environment that the balancing of that three values are that sustainable condition. According to Regulation issued by Ministry of Public Works No.30/PRT/M/2007,the irrigation system comprises of Irrigation Infrastructure, Irrigation Water, Irrigation Management Institution and Human Resources. This research combined the concepts of sustainability and irrigation system management. According to research result, there were 15 indicators of Tilong Irrigation System Sustainability based on the calculation method of AHP. The research result for Sustainable Appraisal of Tilong Irrigation System was Sub DI VII in the Sustainable condition, Sub DI V in the condition of Equitable, Sub DI II in the Sustain condition of environment, Sub DI I in the Environment Sustain Condition, Sub DI III in the Social Sustain Condition, Sub DI IV in the condition unsustain, Sub DI VI in the condition unsustain.