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All Journal JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang Jurnal Teknik Sipil PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat International Journal of Research in Vocational Studies (IJRVOCAS) Indonesian Journal of Multidisciplinary Science Jurnal Teknologi Lingkungan Lahan Basah Makara Journal of Technology Retensi
Hafiyyan, Qalbi
Politeknik Negeri Pontianak
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DINAMIKA ALIRAN AIR TANAH PADA LAHAN RAWA PASANG SURUT Hafiyyan, Qalbi; Marsudi, -; Nurhayati, -
JeLAST : Jurnal PWK, Laut, Sipil, Tambang Vol 4, No 4 (2017): JURNAL MAHASISWA TEKNIK SIPIL EDISI DESEMBER 2017
Publisher : JeLAST : Jurnal PWK, Laut, Sipil, Tambang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (516.849 KB) | DOI: 10.26418/jelast.v4i4.22967

Abstract

Pada lahan rawa pasang surut, tinggi muka air tanah akan mengalami fluktuasi karena adanya pengaruh pasang surut air laut sehingga komoditas tanaman yang  akan dikembangkan harus memperhatikan kemampuan adaptasi dari suatu tanaman terhadap kedalaman muka air tanah pada lahan tersebut. Dalam upaya untuk memaksimalkan fungsi lahan rawa pasang surut perlu dilakukan penelitian mengenai dinamika aliran air tanah pada lahan rawa pasang surut. Pengendalian muka air tanah pada kedalaman tertentu dapat meningkatkan suatu produksi tanaman. Penelitian ini menggunakan data primer berupa data muka air tanah, data muka air di saluran, data sifat fisik tanah, temperatur serta curah hujan. Adapun data sekunder yang digunakan dalam penelitian ini berupa peta lokasi penelitian. Analisis yang dilakukan adalah analisis hubungan antara curah hujan,temperatur, sifat fisik tanah serta muka air di saluran terhadap fluktuasi muka air tanah. Selain itu juga dilakukan simulasi model fluktuasi muka air tanah yang berdasarkan pada hukum Darcy dan persamaan kontinuitas. Temperatur pada lokasi penelitian berkisar antara 210C – 340C, curah hujan maksimum yang terjadi sebesar 226 mm/hari serta elevasi rata-rata muka air tanah adalah +1,561 m untuk penampang melintang dan +1,590 m untuk penampang memanjang. Tanah pada lokasi penelitian dikategorikan pada jenis tanah lempung dengan nilai porositas berkisar antara 66,8 - 75,5 %. Hasil analisis menunjukkan bahwa curah hujan, temperatur, konduktivitas tanah, dan fluktuasi muka air di saluran mempunyai pengaruh pada fluktuasi muka air tanah. Hasil simulasi model menunjukkan bahwa model dapat menduga dengan baik kedalaman muka air tanah pada lahan rawa pasang surut tipe C yang berada di Desa Punggur Besar, Kecamatan Sungai Kakap, Kabupaten Kubu Raya, Kalimantan Barat dengan rata-rata nilai koefisien determinasi (R2) sebesar 90,7%. Kata kunci : aliran air tanah, darcy, rawa, pasang surut
Development of A 2D Numerical Model for Pollutant Transport using FTCS Scheme and Numerical Filter Maitsa, Tias Ravena; Hafiyyan, Qalbi; Adityawan, Mohammad Bagus; Magdalena, Ikha; Kuntoro, Arno Adi; Kardhana, Hadi
Makara Journal of Technology Vol. 25, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study used the finite difference method to develop a numerical model for pollutant transport phenomenon simulation. Mathematically, the phenomenon is often described by the advection–diffusion differential equation, which is obtained from a combination of the continuity equation and Fick’s first law. The Forward Time Central Space (FTCS) scheme is one of the explicit finite difference methods and is used in this study to solve the model due to its simplicity in solving a differential equation. Yet, this method is currently unstable, which results in oscillations in the model. Thus, a numerical filter (Hansen) is added to the FTCS method to improve the stability of the model. The developed numerical model is applied to several 1D and 2D pollutant transport test cases. Simulation results are compared with those of existing analytical solutions to verify the developed model, and they show that the developed model can simulate the pollutant transport phenomenon well. Moreover, the numerical filter can increase the model stability.
Penerapan Metode Crashing (Penambahan Tenaga Kerja Dan Jam Kerja) Pada Pembangunan Struktur Gedung Kantor Fakultas Kehutanan Universitas Tanjungpura: Penerapan Metode Crashing (Penambahan Tenaga Kerja Dan Jam Kerja) Pada Pembangunan Struktur Gedung Kantor Fakultas Kehutanan Universitas Tanjungpura oktaviana, nanda; Arena, Azza; Werda, Werda; Hafiyyan, Qalbi
RETENSI Vol. 3 No. 2 (2023): Retensi
Publisher : Jurusan Teknik Sipil Polnep

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31573/retensi.v3i2.652

Abstract

The office building of the Faculty of Forestry, University of Tanjungpura was built to improve existing facilities and infrastructure. This building is also needed to support academic and non-academic activities of students. So that the building can be used immediately, then the acceleration of time on the construction of the building. This study aims to determine the cost and time of the project due to the acceleration (crashing). The acceleration is carried out by the method of crashing. Calculation of crashing with the alternative addition of the number of workers and working hours (overtime). Where the addition of the number of workers is increased by 15% than the normal number of workers and the addition of working hours (overtime) is done for 3 hours. Calculation of crashing using the alternative addition of the number of workers and the addition of working hours (overtime). Normally, this project requires a cost of Rp 2,410,298,907.92, the duration of the work for 1169 days and a workforce of 525 people. The calculation results with the alternative addition of the number of workers as many as 79 people, requires a cost of Rp 2,419,883,466.82. The time required is 1011 days (158 days more than normal). As for the calculation with the alternative addition of working hours (overtime), the cost of Rp 2,432,295,278.89 and the required duration is 890 days (279 days faster than normal). Based on the calculation results, the addition of Labor and working hours proved to accelerate the implementation time of the project. However, this will also increase the cost of the project.
Kesesuaian Model Hidrograf Satuan Sintetis ITB pada Sub Daerah Aliran Sungai (DAS) Landak Nirmala, Azwa; Hafiyyan, Qalbi
Jurnal Teknologi Lingkungan Lahan Basah Vol 13, No 1 (2025): Januari 2025
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v13i1.86644

Abstract

In this study, flood hydrograph analysis was conducted in the Landak river sub-watershed. The analysis used the synthetic unit hydrograph method, namely HSS ITB-1 and 2 (exact and numerical). The advantage of this method is that this method is developed based on the physical properties and characteristics of river basins in Indonesia. The purpose of this study was to see the suitability of the ITB synthetic unit hydrograph model in the Landak River sub-watershed. The suitability was measured by comparing it with the existing measured discharge data. The results of the HSS ITB modeling provide good agreement with the measured discharge. The HSS ITB-2 Exact model is suitable for use in the Ambawang and Ngabang sub-watersheds. This can be seen from the differences between the HSS ITB-2 Exact flood discharges, which have the smallest difference with the measured flood discharge compared to other HSS ITB models, namely 23.75% for the Ambawang sub-watershed, 55.78% for the Ngabang sub-watershed and 143.14% for the Landak sub-watershed. For the Serimbu sub-watershed, the HSS ITB-1 Numerical model is the model with the lowest error rate compared to other HSS ITB models, which is 25.24%. The results of this study are expected to be a reference in conducting flood discharge analysis for use in planning water structures at the research location.
Pelatihan Auto Level untuk Survei Lokasi pada SMKN 4 SPP Singkawang: Auto Level Training for Location Survey at SMKN 4 SPP Singkawang Anggraini, Irene; Hafiyyan, Qalbi; Rabihati, Etty; Ryanti, Eva; Muhtadi, Ahmad; Purnama, Ikhwan Arief; Setiawan, Randy; Rizal, Rizal; Sasongko, Hartanto Wahyu; Perangin Angin, Imanuel Kemenangenta
PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 10 No. 1 (2025): PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Institute for Research and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/pengabdianmu.v10i1.8393

Abstract

SMKN 4 SPP Singkawang is one of the vocational schools that provides education with a focus on agriculture and agribusiness. The purpose of providing education at this school is to produce graduates who are skilled in agriculture. One of the important skills to have in agriculture is topographic surveying. For this reason, students at school are expected to have these skills. These skills can later be used to support various activities in agriculture, such as irrigation planning and determining plant types based on topographic conditions. Topographic surveys can be carried out effectively and efficiently using optical tools such as auto levels. Based on this, Community Service (PKM) activities in the form of auto level training were carried out by students at SMKN 4 SPP Singkawang. The purpose of this training is for students to be able to use auto levels in mapping land contours for agricultural and agribusiness purposes. The training began by providing an explanation of the optical tools that would be used for the survey. The next stage is for students to practice using the optical tools accompanied by the Community Service (PKM) team. The result of this training is that students are able to understand and practice measuring land contours using auto levels. Finally, this training is expected to improve the skills of students of SMKN 4 SPP Singkawang, which will later be able to support various activities in the fields of agriculture and agribusiness, such as irrigation planning, determining plant types, and so on.
Analysis of Concrete Compressive Strength by Adding Plastic Waste as an Additional Material Mixed in Cement for Manufacturing Pavling Blocks Anggraini, Irene; Purnama, Ikhwan Arief; Hafiyyan, Qalbi
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 5 No. 1 (2025): IJRVOCAS - April
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v5i1.334

Abstract

In daily life, plastic waste feels very close to us as humans. This type of waste is very difficult to decompose,which significantly disrupts both life on land and in the ocean. In this study, the use of heated plastic waste as an additive incement mixtures for making paving blocks is still rarely explored. The aim of this research is to examine the impact of usingplastic waste as an additive in cement mixtures. Additionally, the use of plastic waste as an additive in cement is based on theidea that plastic waste can be transformed into something useful to reduce the troubling amount of plastic waste. For this purpose,this study employs both the Literature Review Method and the Experimental Method to determine how the addition of plasticwaste in paving block mixtures affects the compressive strength of the paving blocks. In this study, plastic waste will be used asan additive to cement with the following compositions: 0% (ordinary concrete), 2.5%, 5%, and 7% of the cement weight. Theresults showed that paving blocks with a 2.5% plastic mixture achieved the highest compressive strength of 26.2 MPa at 21 days,while the highest water absorption was observed in the 5% plastic mixture, with a value of approximately 6.14%. Overall, thetotal strength exceeded the planned compressive strength of 20 MPa based on the SNI 03-0691-1996 standard, making it suitablefor road use with a B quality grade.
Application of Finite Difference Method in Simulating 2D Partial Dam-break Flow with an Obstacle Hafiyyan, Qalbi; Nirmala, Azwa; MS, Murad; Sumiyattinah, Sumiyattinah; Bachtiar, Vivi; Yusuf, Muhammad Yusuf
Indonesian Journal of Multidisciplinary Science Vol. 2 No. 12 (2023): Indonesian Journal of Multidisciplinary Science
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/ijoms.v2i12.609

Abstract

A numerical model capable of simulating the dam-break flow is required to reduce the detrimental impact on the downstream area of the dam. This study aims to see how the characteristics and patterns of flow due to partial dam failure and the presence of an obstacle in the floodplain. In real life, the obstacle can be considered as a building. In this research, a model based on the FTCS method was developed with the addition of a Hansen numerical filter. This model is known as the FTCS-Hansen model. The Hansen filter in this study is used to enhance the numerical of the model and reduce oscillations due to shock waves. The FTCS-Hansen model simulates a 2D partial dam break with an obstacle. The simulation results are compared with other simulation results from previous studies. This comparison intends to see the performance of the FTCS-Hansen model. The results show good agreement between the FTCS-Hansen model and other numerical models. In addition, the complicated dam-break flow characteristics due to the presence of an obstacle (reflection and diffraction) can also be well captured by the FTCS-Hansen model.
ANALYSIS OF THE TYPES AND CHARACTERISTICS OF THE TIDES USING THE ADMIRALTY METHOD ON TWO RIVERS IN THE KUBU RAYA DISTRICT Nirmala, Azwa; Hafiyyan, Qalbi
Jurnal Teknik Sipil Vol 23, No 2 (2023): JURNAL TEKNIK SIPIL EDISI MEI 2023
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtst.v23i2.64402

Abstract

A study of the tides in the river has been carried out in this paper. The rivers studied are the Jawi River (Kakap) and the Nipah River. The two rivers are located in Kubu Raya Regency, West Kalimantan. This study aims to determine the type of tides and water level elevation in the two rivers. This study uses the Admiralty method to analyze existing tidal data. This method is commonly used in tide analysis. The results show that the tidal type of the Jawi River is a diurnal tide. The water level in the Jawi River is HHWL of 1.4 m (+0.86 m from MSL) and LLWL of "“0.319 m (-0.859 m from MSL). Meanwhile, the tidal type of the Nipah River is a mixed tide prevailing diurnal. In addition, the water level is HHWL of 1.167 m (+0.82 m from MSL) and LLWL of "“0.473 m (-0.82 m from MSL). This study is expected to be helpful as a reference for infrastructure development in the research area.
Co-Authors - Nurhayati Adityawan, Mohammad Bagus Ahmad Muhtadi Arena, Azza Arno Adi Kuntoro Azwa Nirmala Hadi Kardhana ikhwan Arief Purnama Irene anggraini Magdalena, Ikha Maitsa, Tias Ravena Marsudi, - MS, Murad oktaviana, nanda Perangin Angin, Imanuel Kemenangenta Rabihati, Etty Randy Setiawan, Randy Rizal Rizal Ryanti, Eva Sasongko, Hartanto Wahyu Vivi Bachtiar Werda, Werda Yusuf, Muhammad Yusuf