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Zandra Singal, Rachel
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Journal : Borneo Engineering : Jurnal Teknik Sipil

 1 
Pemetaan Curah Hujan Dalam Upaya Mengurangi Resiko Bencana Hidrometeorologi Dengan Sistem Informasi Geografis (SIG) Untuk Wilayah Kalimantan Utara Rachel Zandra Singal; Noptri Jumario
Borneo Engineering : Jurnal Teknik Sipil Volume 3 Nomor 2 Tahun 2019
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v3i2.1174

Abstract

North Kalimantan is one of the regions in Indonesia which is prone to hydrometeorological disasters. The purpose of this study was to determine the rainfall analysis of the North Kalimantan Region as a basis in finding rainfall levels in areas that do not have climatological stations, knowing the rainfall maps of the North Kalimantan Region and knowing the conditions of high rainfall causing flood prone in the North Kalimantan region. Rainfall data collection locations are climatology stations Tanjung Harapan, Juwata, Tuvai Semaring, Kalimarau and R.A. Bessing. Rainfall data is taken from OGIMET for 10 years. The result of rainfall analysis is the average monthly rainfall, which is from January to December. The method used to determine the monthly rainfall value in the North Kalimantan region is the Spatial Analyst Interpolation -Kriging method. The results are in the form of monthly rainfall maps, from January to December. Monthly rainfall map is a source of information on the value of rainfall in the region in North Kalimantan. Maximum rainfall is found in the areas of Tanjung Selor and Tarakan, namely January 313,368 mm, May 366,238 mm, July 358,868 mm and December 324,513 mm. Map of monthly rainfall in January, May, July and December is a parameter to see the condition of high rainfall causing hydrometeorological disasters. Through this research it is expected to anticipate the risk of disasters caused by the weather.
Pengaruh Nilai CBR Tanah Bermasalah Yang Distabilisasi Dengan Fly ash di Wilayah Perbatasan Provinsi Kaltara Fuad Harwadi; Hasrullah Hasrullah; Rachel Zandra Singal
Borneo Engineering : Jurnal Teknik Sipil Volume 6 Nomor 3 Tahun 2022
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v1i1.3206

Abstract

In construction problem soils are often encountered, as well as in the border area of North Kalimantan Province, there are problematic soils such as peat soil and expansive soil. Problematic soils have low bearing capacity and high compressibility, therefore it is necessary to make improvements in problematic soils. One of the soil improvements whose application is quite easy and relatively inexpensive to implement is stabilization. This research uses coal waste material (fly ash) as a stabilizer from PLTU Sekayan in Apung village, Kaltara Province. The purpose of this study was to obtain changes in the CBR parameters on peat soil and expansive soil by mixing fly ash with variations in the addition of fly ash by 20%, 40%, and 60%, and through curing for 20, 30, 40, and 60 days. The analysis is presented in graphical form by comparing the original soil that has not been stabilized and the soil that has been stabilized with fly ash. From this research, it was found that the addition of a stabilizing agent in the form of fly ash can increase the CBR value in problematic soils. In the expansive soil CBR test in the laboratory, there was a very large increase in the CBR value, namely from the initial condition of 2,65% to 33.7% with the addition of 60% fly ash and a curing period of 60 days. On peat soil, the initial CBR value was 0,79% to 9.8% with the addition of 60% fly ash and a curing period of 60 days.
Evaluasi Saluran Drainase Perkotaan di Jalan Langsat Kota Tanjung Selor Kabupaten Bulungan Rachel Zandra Singal; Yopi To'la Rombe Allo
Borneo Engineering : Jurnal Teknik Sipil Volume 7 Nomor 3 Tahun 2023
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v7i3.4174

Abstract

Jalan Langsat is a road in the urban area of Tanjung Selor which is frequently flooded. Inundation occurs when the intensity of rain is high so that the water discharge from the upper reaches of the Kayan River is more than usual, which causes the drainage channels to be unable to accommodate the flowing water discharge. This is due to the decreased capacity of the channel and increased flow rate, besides that the drainage channel is experiencing siltation due to the large amount of garbage and sediment in the drainage channel. This study aims to determine the capacity of existing drainage channels to accommodate and drain rainwater discharge. The method used in this study is the evaluative method with primary and secondary data collection stages, then data analysis is hydrological analysis with four methods, namely the Normal distribution method, Normal Log, Log Person III and Gumbel and canal hydraulic analysis. The results of the calculation used to determine the planned rainfall intensity are the Log Normal distribution with a return period of 10 years of 527,228 mm/hour. The calculation of rainfall intensity is used by the Mononnobe formula, while for the evaluation of channel capacity, the evaluative method is used by comparing the channel capacity with the design discharge. Where Qs Qr then the channel capacity is safe, and if Qs Qr then the channel capacity is not safe. From the results of the evaluation of the capacity of the drainage channels, there were 23 channels reviewed, 15 channels that were unsafe and 8 channels that were safe. Furthermore, the choice of problem handling at the study location, namely for channels that are declared safe, canal normalization is carried out and for channels that are unsafe or overflow, re-planning of channel dimensions is carried out.
Co-Authors Abdul, Kartini Maharani Darmawan, Rendy Andre Fuad Harwadi Hasrullah Hasrullah Imam Muazansyah, Imam Maharani, Larasati Nur Noptri Jumario Nur Azilz Jamal Nur, Mardhawiah Pangerang, Fitrah Pangerang Petronela Y. Wairissal Hermanus Ratna Dwi Christyanti, Ratna Dwi Rusyanti, Nila Yopi To'la Rombe Allo Yuliansyah Yuliansyah