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All Journal Civil Engineering Forum Teknik Sipil Inersia : Jurnal Teknik Sipil dan Arsitektur Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Teknik Sipil JURNAL SPASIAL Community Empowerment Journal of the Civil Engineering Forum
Bambang Triatmodjo
Jurusan Teknik Sipil dan Lingkungan, Fakultas Teknik, UGM
Agriculture, Biological Sciences & Forestry Arts Humanities Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Public Health Social Sciences Transportation

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PENGARUH KONDISI AWAL KELENGASAN TANAH TERHADAP DEBIT PUNCAK HIDROGRAF SATUAN Sasmito, Sasmito; Triatmodjo, Bambang; Sujono, Joko; Harto, Br, Sri
Jurnal Teknik Sipil Vol 13, No 3 (2015)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (239.144 KB) | DOI: 10.24002/jts.v13i3.879

Abstract

Abstrak: Hidrograf satuan adalah salah satu cara untuk memperkirakan besarnya banjir di sungai akibat hujan pada suatu DAS. Hidrograf satuan sangat populer dan dipakai secara luas di dunia. Metode ini mempunyai fleksibilitas yang rendah terhadap hujan yang berbeda, sehingga hidrograf yang dihasilkan berbeda-beda pada setiap hujan. Hal ini diduga disebabkan antara lain karena teori hidrograf satuan mengabaikan pengaruh kondisi awal kelengasan tanah (antecedent soil moisture condition, AMC) pada proses penurunan hidrograf satuan. Tulisan ini menyajikan hasil penelitian tentang pengaruh AMC terhadap debit puncak hidrograf satuan observasi (qp-obs). Dalam penelitian ini variabel AMC didekati dengan besaran defisit kelengasan tanah (soil moisture deficit, SMD) yang mempunyai makna berlawanan dengan AMC. SMD direpresentasikan dengan variabel Sc (storage capacity) yakni volume udara di dalam pori tanah yang ditinggalkan air karena terevapotranspirasi keluar. Penelitian dilaksanakan dengan menggunakan data hidrologi (hujan, debit aliran, dan evaporasi) yang dikumpulkan dari 3 DAS hulu (upper catchment) di kawasan Gunung Merapi. Percobaan penelitian dilakukan dengan cara menurunkan hidrograf satuan dengan dua cara, yakni cara konvensional (Collins) menghasilkan hidrograf satuan observasi (HSosb), dan cara simulasi menggunakan model tangki menghasilkan hidrograf satuan simulasi (HSsim). Analisis pengaruh Sc dilakukan terhadap debit puncak HSosb dan debit puncak HSsim. Penelitian menghasilkan temuan yang dapat disimpulkan sebagai berikut: (1) Hubungan Sc dan debit puncak hidrograf satuan, menunjukkan semakin besar Sc (semakin kecil AMC) debit puncak HSobs semakin kecil, (2) Formula koreksi yang didapat berbentuk fungsi eksponensial (qp-obs)/(qp-obs-kor)=1,104 e-0,012Sc, dengan qp-obs-kor adalah debit puncak hidrograf satuan observasi terkoreksi, (3)  HS observasi terkoreksi rerata mempunyai debit puncak puncak paling tinggi dibanding debit puncak HSS Nakayasu dan debit puncak HSS Gama 1.
DAMPAK PEMBANGUNAN JALUR JALAN LINTAS SELATAN (JJLS) TERHADAP PERUBAHAN PENGGUNAAN LAHAN DI DESA GADINGSARI, KECAMATAN SANDEN, KABUPATEN BANTUL, YOGYAKARTA Edy, Hendry; Baiquni, M.; Triatmodjo, Bambang
Jurnal Spasial Vol 6, No 1 (2019)
Publisher : Program Studi Pendidikan Geografi STKIP PGRI Sumatera Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (875.464 KB) | DOI: 10.22202/js.v6i1.3270

Abstract

Infrastructure Development Jalur Jalan Lintas Selatan (JJLS) is a National program that passes through 5 provinces in Java, which is one of the provinces passed through the Special Region of Yogyakarta. One of the villages passed by the JJLS development in the Special Province of Yogyakarta is Gadingsari Village, Sanden District, Bantul Regency. In this study, it will be seen how changes in land use in Gadingsari village before and after JJLS. The purpose of this study was to analyze changes in land use that occurred in Gadingsari Village. The analytical method used is a qualitative descriptive analysis method. Changes in land use were obtained from the Satellite Image Overlay Analysis in the span of time, namely before JJLS was built in 2013 and after JJLS was built in 2017 and strengthened with field surveys and in-depth interviews. From the results of the research, it was found that the land area for settlements in Gadingsari Village before and after the JJLS had changed. Before the existence of JJLS residential area was 78.90 hectar and it expanded to 104.93 hectar after the construction of JJLS, there was an increase of around 32.99% .
EVALUASI SISTEM MITIGASI PENANGANAN BENCANA GEMPABUMI DI KECAMATAN BANTUL PROPINSI DAERAH ISTIMEWA YOGYAKARTA Indah, Lenni Kartika; Triatmodjo, Bambang; Triatmadja, Radianta
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.466 KB)

Abstract

A tectonic earthquake in Bantul Regency, Yogyakarta occurred at the magnitude of 5.9 Richter Scale just before 05.54 p.m. The earthquake duartion was only about one minute but killed thousands of inhabitants, destroyed uncountable number of settlement buildings and damaged other buildings of about billions rupiahs. This fact showed that disaster mitigation system has nott been effective to minimize disaster impact. To absolutely prevent the earthquake disaster to happen is indeed very impossible to do. But humans can seek efforts to take preventive measures to reduce the adverse impact of the earthquake before it occurs again. Therefore, it is necessary to carry out the system of disaster mitigation so that victims and material losses resulted from the earthquake disaster can be minimized. The research objective is to obtain the physical conditions and problems faced by Bantul Regency after the earthquake disaster, to evaluate the exercise of earthquake management, and finally to search solutions in anticipating the occurrence of the earthquake disaster. It is expected that in the future, the response and the willingness of dealing similar disaster can be prepared. A field research is conducted by using three techniques including observation, interview, and questionnaire given to village apparatuses and local society. A bottomup approach is used to ensure that the system to be developed can actually reflect the emergent needs of the community. The result of the research indicates that it is necessary to carry out several alternatives for immediate prevention and comprehensive handling of earthquake disaster by meeting objectives in appropriate strategy of mitigating measure priorities. The first priorities are given to constructing measures or structuring enduring-to-earthquake houses with priorities rank given to forming elements of enduring-to-earthquake building. The first is the frame structures (sloof, column, and block), the roof elements, and the foundation elements, the second is the measures of social aids giving, and the third is the measures of community development with education and training. The fourth is measures of economic development, and, finally, the fifth is the measures of instance and managerial development (early warning system). It is expected that the objectives of the priority strategy can help society to take any appropriate measures in anticipating the risks of earthquake disaster.
ANALISIS LIMPASAN LANGSUNG DENGAN MODEL DISTRIBUSI DAN KOMPOSIT Harsanto, Puji; Kironoto, Bambang Agus; Triatmodjo, Bambang
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (210.88 KB)

Abstract

Hydrological models are classified as lumped and distributed. Lumped models ignore the spatial variability of precipitation, and other related processes. Even though lumped model are unable to account for internal variation of hydrological processes, they have the advantage of simplicity. Distributed hydrological model on the other hand account for spatial variation of hydrological processes and parameters. This type of model has the potential to give more accurate results but computationally more complex. The spatially distributed input and analysis required by spatially distributed model can be met by incorporating a system that can manage data on a grid basis. An approach to handle this problem is using geographic information system (GIS). The overall objective of this study was to comparing of distributed and composite model. The SCS curve number method also known as the hydrologic soil cover complex method, is widely used procedure for runoff estimation. This method includes several important properties of the watershed namely soil’s permeability, landuse and antecedent soil water conditions which are taken into consideration. Daily runoff calculations were generated using the SCS curve number method, its based on the retention parameter, S, initial abstractions, Ia (surface storage, interception, and infiltration prior to runoff), and daily rainfall, Rday. Ratio of initial abstraction (Ia) to retention parameter (S) called λ is changes from time to time. Because of its, the hydrology analysis to estimating direct runoff need calibrate for this parameter. Goodness of fit analysis is used to comparing of both, distributed model and composite model. The average of relatif error, correlation factor, and coefficient of determination, R2 for distributed model respectively are 25.70 %, 0.71 and 0.53, from composite model are 30.15 %, 0.66 and 0.44. The result from research is obtained that the distributed model is more accurate than composite model. The average initial abstraction ratio from distrubted model is 0.35 and composite model is 0.04.
Pembangunan Ruang Terbuka Hijau (RTH) di Kampung Tulung RW.02 Kota Magelang Marleni, Ni Nyoman Nepi; Legono, Djoko; Triatmodjo, Bambang; Istiqomah, Nurul Alvia
Community Empowerment Vol 5 No 2 (2020)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (870.651 KB) | DOI: 10.31603/ce.v5i2.4060

Abstract

Ruang Terbuka Hijau (RTH) sangat penting untuk suatu perkotaan karena selain menjadi fungsi ekologis, RTH juga dapat memelihara fungsi sosial budaya, dan estetika suatu wilayah perkotaan. Pembuatan RTH di RW 02 Kampung Tulung, Kecamatan Magelang Tengah, Kota Magelang dinilai penting untuk mengimbangi tingginya densitas penduduk ditambah dengan adanya beberapa bengkel motor dan mobil yang berpotensi pada pencemaran udara yang tinggi. Selain itu, RW ini minim ruang publik yang dapat mendukung sarana berinteraksi warga. Pembangunan RTH ini bertujuan untuk merancang dan membangun RTH yang dapat memenuhi fungsi ekologis, ekonomi, sosial-budaya, dan estetik. Dasar perencanaan kebutuhan luas RTH minimum dihitung dengan metode berdasarkan jumlah penduduk yang merujuk pada Peraturan Menteri Pekerjaan Umum No. 05 tahun 2008. Konsep yang digunakan yaitu pengembangan RTH eksisting dengan penambahan tanaman fungsional, fasilitas dan teknologi ramah lingkungan pada lahan seluas 461,58 m2. Teknologi ramah lingkungan yang dibangun berupa 48 lubang resapan biopori sebagai kompensasi resapan untuk air limpasan dari lahan yang diperkeras untuk fasilitas olahraga. Fasilitas bangku, mainan, dan rumah organik dibangun guna mendukung fungsi sosial budaya, ekonomi dan estetik. RTH yang telah dibangun menjadi pusat kegiatan warga dalam bidang kesehatan dan inovasi serta berhasil menjadi Juara Harapan 1 untuk lomba taman se Kota Magelang tahun 2019 yang diselenggarakan oleh Badan Lingkungan Hidup (BLH) Kota Magelang.
Analisis Kebutuhan Bak Penampung Lumpur IPA sebagai Upaya Pengendalian Dampak Lingkungan Sari, Deasy Ambar; Kamulyan, Budi; Triatmodjo, Bambang
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 17, No 3 (2020): November 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1186.431 KB) | DOI: 10.14710/presipitasi.v17i3.284-294

Abstract

Sand Drying Bed (SDB) is designed for reducing the potential environmental impact caused by Water Treatment Plants – WTP residuals. Currently, the technical document of SNI (Indonesian National Standard) is still difficult to be applied by the engineer in determining required SDB’s volume based on WTP’s capacity and raw water conditions. The purpose of this research is to analyze WTP’s sludge production for designing SDB’s volume. The research was taken place at Pajangan WTP (50 l/s capacity) and Bantar System of Kartamantul WTP (400 l/s capacity) in Yogyakarta Special Province, which use Progo River as raw water source. The data used in the analysis is raw water turbidity compilation data, TSS (Total Suspended Solid) fluctuations rate of raw water, coagulant dosage used, specific gravity range of dried sludge and imhoff settling ratio based on laboratory tests. The results obtained show that one-year production of dry sludge on Pajangan WTP Unit is estimated to reach 244.55 m3/year from the total number of WTP residual (water and sludge) produced of around 43,158.52 m3/year. Meanwhile, the dry sludge produced on Kartamantul WTP Unit is estimated to reach 1,550.49 m3/year from the total number of WTP residual produced of around 273,635.22 m3/year. Then, each of Pajangan and Kartamantul WTP unit produced about 2.365 m3/day and 1.874 m3/day sludge for every 1 liter/second of raw water. This large amount of sludge leads the SDB has to be better designed.
Analysis of Gongseng Dam Break-Induced Flood in East Java, Indonesia Through 2D Iber Software Ahmadi, Sa’iyd Husayn; Triatmodjo, Bambang; Benazir
Journal of the Civil Engineering Forum Vol. 10 No. 1 (January 2024)
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.9929

Abstract

The dam is a crucial river-crossing structure that ensures a sustainable water supply and offers numerous benefits. However, the potential hazard of dam failure is an imminent threat that could materialize unexpectedly. To comprehend the potential impact of dam break flood and identify vulnerable areas, it is essential to conduct rigorous analysis and simulate various dam failure scenarios. This comprehensive assessment is invaluable for informed land use planning and the development of effective emergency response plans. Therefore, this study aimed to analyze flood inundation resulting from the hypothetical failure of Gongseng dam, using Iber model. The modeling approach relied on a two-dimensional finite volume shallow water model, guided by specialized software. The scenarios for Gongseng dam break showed inundation areas of 12.57 km² and 7.55 km² for overtopping and piping failure, respectively. Overtopping failure resulted in the highest discharge, with Von Thun method causing severe damage due to wide break dimensions, and eventually leading to catastrophic consequences. However, this study showed that Froehlich method provided the most rational prediction for break parameters. In contrast to the other methods focusing solely on water height behind dam, Froehlich equation considered both the volume and height at the time of failure. Implementing dam break analysis held the potential to benefit downstream communities by providing inundation maps, thereby aiding in the mitigation of flood risks. Particularly, in situations with limited data and resources, as shown in this study, the cost-effective modeling method proposed could be an attractive option for simulating extreme flood induced by dam break.
Mode Choice and Spatial Distribution of Coal Transport in Jambi, Indonesia Nugroho, Nurman; Priyanto, Sigit; Triatmodjo, Bambang
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.64336

Abstract

Coal is an important commodity for Jambi Province. Based on data from the Central Bureau of Statistics, in the first quarter of 2022, the value of coal exports reached 10.75% of the total export value. Apart from being exported, coal commodity is also used for domestic purposes. The transport used at this time is only through public roads. The use of these routes results in many problems such as traffic accidents, congestion, and social conflicts. Therefore, the number of vehicles allowed to pass on public roads is limited. This has resulted in the production target plan not being achieved, only 17.3 million tonnes out of 40 million tonnes in 2022. Hence the need for other routes for transport such as rivers, special roads, and railways. This research is intended to analyse coal transport trips using trucks, barges and railways. This research discusses the closest route, mode selection, and transport costs based on the distance travelled and the travel time of each mode. The search for the closest travel route is done by spatial analysis with Network Analyst on ArcGIS. Mode choice was analysed using the multinomial logit method. Meanwhile, transport costs are calculated based on the principle of generalised cost. Modelling results on the selection of mode, during the rainy season the most efficient mode is barging with a selected probability of 44%, while rail 28% and transport by truck 27%. During the dry season, the probability of transport by railway is 93%, barge 4% and truck 3%. The results indicate that the most efficient mode during the rainy season is barging and during the dry season transport by railway.
Co-Authors Ahmadi, Sa’iyd Husayn Bambang Agus Kironoto Benazir Budi Kamulyan Djoko Legono Hendry Edy Istiqomah, Nurul Alvia Joko Sujono Lenni Kartika Indah M. Baiquni Ni Nyoman Nepi Marleni Nugroho, Nurman Puji Harsanto Radianta Triadmadja Sari, Deasy Ambar Sasmito Sasmito, Sasmito Sigit Priyanto Sri Harto, Br, Sri