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All Journal SMARTek JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR MEKTEK IPTEK The Journal for Technology and Science Jurnal Aplikasi Teknik Sipil Jurnal Hidroteknik Jurnal Pengabdian Magister Pendidikan IPA REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Jurnal Sains dan Teknologi Tadulako Tadulako Science and Technology Journal
I Gede Tunas
Jurusan Teknik Sipil, Fakultas Teknik, Universitas Tadulako
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Transportation

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Development Of Unit Hydrograph Parameters Model Using Selected Watershed Parameters on Rivers in Central Sulawesi Umboro Lasminto; I Gede Tunas
Jurnal Aplikasi Teknik Sipil Vol 20, No 3 (2022)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2446.813 KB) | DOI: 10.12962/j2579-891X.v20i3.13071

Abstract

Permasalahan utama dalam analisis debit berbasis hidrograf satuan adalah menetapkan metode yang paling sesuai untuk memperkirakan parameter hidrograf. Paper ini bertujuan merumuskan persamaan parameter hidrograf menggunakan lebih banyak jumlah parameter DAS terindikasi berkorelasi tinggi yang didasarkan pada data 8 DAS terukur di Provinsi Sulawesi Tengah, Indonesia. Sebanyak  12 parameter DAS yaitu luas DAS (A, km2), panjang sungai utama (L, km), kemiringan sungai utama (S), panjang sungai utama sampai titik terdekat titik berat DAS (Lc, km), faktor bentuk DAS (FB), jumlah orde sungai (n), jumlah pertemuan sungai (JN), panjang sungai orde 1 (L1, km), panjang sungai semua orde (Lt, km), kerapatan drainase (D), jumlah ruas orde 1 (R1), dan jumlah ruas semua orde (Rt) digunakan untuk membangun 3 parameter utama hidrograf satuan yaitu waktu puncak (Tp, hour), debit puncak (Qp, m3/s) dan waktu dasar (Tb, hour). Analisis regresi linier diterapkan terhadap 12 parameter DAS tersebut untuk memformulasikan ketiga parameter hidrograf. Hasil kajian menunjukkan bahwa setidaknya 5 dari 12 parameter DAS yang diuji memperlihatkan pengaruh yang sangat besar pada ketiga parameter hidrograf dengan indikator RMSE yang sangat rendah: 0.019, 0.098, 0.014 secara berturut-turut untuk Tp, Qp, dan Tb. Rendahnya indikator RMSE mengindikasikan bahwa ketiga persamaan parameter hidrograf tersebut berkinerja sangat tinggi. Namun demikian, validasi pada DAS-DAS terukur lainnya masih harus dilakukan untuk dapat diapkikasikan pada skala DAS lebih luas dan beragam
Analisis Debit Air Limpasan Permukaan Akibar Perubahan Tata Guna Lahan Pada Daerah Aliran Sungai Bangga Andiesse, V.W.; Sutapa, I.W.; Tunas, I.G.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.700

Abstract

Surface runoff is rainwater that cannot be retained by soil, vegetation or basins and eventually flows directly into rivers or the sea. The amount of surface runoff determines the amount of damage caused by erosion and flooding. The amount of surface flow is influenced by rainfall, vegetation (land cover), the presence of water storage buildings and other factors. Damage to watersheds can cause various disasters, namely floods, droughts and landslides. The Bangga watershed has an area of 61,0561 km2 and has a river length of 20.7 km. Das Bangga has also experienced flash floods and mudflows in 2019 which caused 500 houses to be flooded and residents died after being washed away by the flood. The purpose of the study was to calculate runoff in the Bangga River watershed using the SCS-CN method. In this study the data used is secondary data, namely Rainfall data taken from the Upper Bangga and Lower Bangga stations and Land Use Maps and Soil Type Maps.  The period of secondary data used in 2018-2021. Land use and soil types are analyzed from land use maps and soil type data obtained. Map analysis was carried out using ArcGIS Software by making an overlay between the land cover map and the soil type map.  The second result of this analysis is the area of each type of land use and soil type hydrology group and its distribution in the Bangga watershed.  Based on the results of the analysis, the runoff using the SCS method obtained the maximum result in 2019 of 29,222 mm with a runoff volume of  1.784.155,751 m3, and the minimum runoff in 2018 of 0,072 mm with a runoff volume of 4.375,573085 m3. The occurrence of Land Use changes, climate change and human treatment of the environment can affect runoff.
Prediksi Kerawanan Banjir di Daerah Aliran Sungai Olaya Kabupaten Parigi Moutong Rivai, R.; Tunas, I.G.; Mardin, R.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 2 (September 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i2.744

Abstract

This study aims to determine the distribution of flood vulnerability levels in the Olaya Watershed located in Parigi Moutong Regency, using two previous research methods, namely the Hamdani et al. method, and the Latue & Latue method, which were then validated in the field to determine the level of validity of the two methods. The method used is data collection such as rainfall data, flood incident data, Olaya Watershed maps, DEMNAS maps, soil type maps and spot 6 satellite image maps. The analysis carried out in this study includes classifying and scoring the classification of rainfall parameters, slope gradient, land use, soil type, river buffer, elevation and Overlay is carried out by combining all input flood vulnerability parameters that have been mapped, to obtain flood vulnerability values and flood vulnerability level maps. The results of this study are the results of the analysis of flood vulnerability levels using the Hamdani et al. method, divided into Most Safe, Threatened, Vulnerable and Most Vulnerable while the Latue & Latue method is divided into Low, Medium and High. The results of these two methods are not yet in accordance with the flood events in the Olaya Watershed, this is because the weight of each parameter is not yet appropriate, there are still parameters that have not been included in the flood vulnerability modeling, the scoring of the parameter classification is not yet appropriate and the classification and scoring of the parameters are different
A Study on the Effects of Climate Change on the Availability of Water and Kalangkangan Watersheds Arafat, Yassir; Tunas, I Gede; Amiruddin, Aswar
Tadulako Science and Technology Journal Vol. 1 No. 1 (2020): TADULAKO SCIENCE AND TECHNOLOGY JOURNAL
Publisher : LPPM Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/sciencetech.v1i1.15059

Abstract

Climate change has a huge impact on the availability of water resources. Based on the case, this research is deemed necessary to do. Water availability is an essential issue related to climate change. The most perceived impacts due to climate change are climate anomalies; the rainy season lasts shorter with increasing intensity and the dry season lasts longer than usual conditions. The body of water cannot accommodate high-intensity rainwater, so it flows quickly into the sea. Relatively, a long dry season results in drought. The vulnerability of the availability of water sources in the Kalangkangan watershed, Tolitoli Regency was indicated through the reduction in river discharge. This changes in discharge had the potential to be difficult in meeting the needs of irrigation or clean water. If there is no attempt to protect and repair the water sources, it is believed that the reduction in discharge will continue until it hits a critical condition. The availability of water from the rain - discharge simulation model in the Kalangkangan watershed for wet conditions (Q20%) had a maximum discharge of 20.62 m³ / sec in June (decade II), and an average discharge of 13.59 m³ / sec. For normal conditions (Q50%) the maximum discharge was 19.47 m³ / sec in June (decade I), the minimum discharge was 5.35 m³ / sec in June (decade I) and the average discharge was 11.13 m³ / sec. For dry conditions (Q80%), the minimum discharge was 5.18 m³ / sec in May (decade I) and the average discharge was 9.05 m³ / sec
TWO-DIMENSIONAL WATER SURFACE PROFILE ANALYSIS AT THE BEND OF PALU RIVER SEGMENT SP 304–SP 318 USING SMS AQUAVEO (RMA2 MODULE) Nur, Nur Hidayat; Bariroh, Nina; Rahmi, Sitti; Tunas, I Gede; Andiese, Vera W; Warliawati, Sri
Jurnal Sains dan Teknologi Tadulako Vol 12 No 1 (2026): April 2026
Publisher : Postgraduate Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/jstt.v12i1.1051

Abstract

River bends are hydraulically complex zones characterised by centrifugal-force-driven secondary currents that produce differential water surface elevations, asymmetric velocity distributions, and lateral sediment transport. This study presents a two-dimensional (2D) hydrodynamic analysis of the water surface profile along a meandering reach of the Palu River (SP 304–SP 318), located in Tulo Village, Dolo District, Sigi Regency, Central Sulawesi, Indonesia. The RMA2 finite-element module within the Surface Modelling System (SMS) Aquaveo was employed. A 50-year return-period flood discharge (Q₅₀ = 387.85 m³/s) was estimated using the Snyder Synthetic Unit Hydrograph method, based on 15 years (2007–2021) of daily rainfall data from three meteorological stations. The Log Pearson Type III distribution was selected through Chi-square goodness-of-fit tests. A triangular 2D mesh at 5 m spacing was constructed in UTM Zone 49 WGS84 coordinates, and model calibration yielded a Manning roughness coefficient n = 0.01, matching the field-measured mid-channel velocity of 0.20 m/s. Under Q₅₀ conditions, the simulated maximum flow velocity is 2.88 m/s (SP 313–SP 314, pre-bend segment), maximum water depth is 3.408 m (outer bank), and the highest water surface elevation is 26.831 m above sea level (upstream boundary). The outer bank consistently exhibits higher velocities and water surface elevations than the inner bank, confirming superelevation and active scour at the concave bank. These findings provide critical hydrodynamic data for river bank protection and flood management planning along the Palu River corridor.
Co-Authors Amiruddin, Aswar Andiese, Vera W Andiesse, V.W. Anwar, Nadjadji Arody Tanga Asrafil Asrafil Bariroh, Nina Maksi Sirampun Mardin, R. Mohamad Bagus Ansori Nastasia Festy Marginia Nober Sampe Nur, Nur Hidayat Parwati, Ni Made Suwitri Rivai, R. Saparudin Saparudin sitti rahmi, sitti Surya Budi Lesmana Sutapa, I.W. Umboro Lasminto Vera Wim Andiese Warliawati, Sri Yassir Arafat