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All Journal REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
Sutapa, I.W.
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Studi Laju Infiltrasi Pada Lahan Irigasi Gumbasa (Studi Kasus di BGKn 38, 42 dan 51) Afrianto, B.; Sutapa, I.W.; Hidayat, N.; Herman, R.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 3 Issue 1 (March 2022)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v3i1.329

Abstract

The 2018 earthquake that shook the city of Palu and surrounding areas with the power of 7.4 MW triggered liquefaction in several locations. Earthquakes and liquefaction that occurred caused damage to Gumbasa’s irrigation canals and some paddy fields. This study was conducted at three points in the paddy fields which 2 points located in the Soulowe village and Sidera village, District of Dolo and one is located in the Lolu village, District of Biromaru. This study aims to determine the infiltration rate in the residents’s paddy fields which have not been planted with paddy for a long time. This is because until the data retrieval performed, Gumbasa irrigation network has not functioned and still under repair. Data were collected using a Double Ring Infiltrometer measuring instrument. The results obtained from this study for constant infiltration rate of BGKn 38 = 1.27 cm/hour, BGKn 42 = 1.10 cm/hour and BGKn 51  = 0.75 cm/hour, which all three are classified as a rather slow with a constant infiltration rate ranging from 0.5 to 2 cm/hour. For the difference in fc values, BGKn 38 and BGKn 42 at 0.17 cm/hour and BGKn 42 and BGKn 51 at 0.35 cm/hour, so that BGKn 38 and BGKn 51 is 0.52 cm/hour. Meanwhile, the value of the difference f0 from the three points is BGKn 38 with BGKn 42 at 3.82 cm/hour and BGKn 42 with BGKn 51 at 4.43 cm/hour, and BGKn 38 with BGKn 51 is 0.61 cm/hour.
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 : Civil Engineering Department, 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.
Karakteristik Kuat Geser Tanah Dengan Tanpa Akar Vegetasi Pada Lereng Ruas Tawaeli -Toboli Martini, M.; Sutapa, I.W.; Ramadhani, S.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.715

Abstract

The contribution of vegetation to slope stability is based on hydrological and mechanical aspects. The effect of vegetation on the hydrological aspect is to reduce soil water content through transpiration, interception and evapotranspiration. And the mechanical influence of vegetation is through strengthening the roots in the soil. Water absorption by vegetation varies depending on age and density, rainfall factors and soil type. Cohesion (c) and friction angle () are soil shear strength parameters. In soil that has vegetation roots, it will form a composite material, namely the root-soil model, there is an increase in cohesion value with the presence of roots, this is what is called apparent cohesion (c'R). Several parameters that are believed to influence the shear strength of the soil and roots will also be studied, namely the physical properties of the roots, namely diameter, type of root/vegetation, and water content. For mechanical properties, namely the tensile strength of the roots, the shear strength parameters of the soil both without and with roots, namely cohesion, apparent cohesion and internal friction angle. The type of vegetation reviewed in this research is elephant grass with fibrous roots. The results obtained indirectly by increasing the value of cohesion and angle of friction in the soil due to the presence of roots influence/increase the shear strength of the soil. The volume of roots in the soil greatly influences changes in the cohesion value or angle of friction of the soil. As the root volume decreases, the shear strength value decreases, the shear strength parameter also decreases. In this study, the change in soil shear strength values in sandy soil conditions, the increase in cohesion value was not as significant compared to the change in friction angle values.
Co-Authors Afrianto, B. Andiesse, V.W. Herman, R. Martini, M. N. Hidayat, N. Ramadhani, S. Tunas, I.G.