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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

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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.
ANALYSIS OF THE TYPES AND CHARACTERISTICS OF THE TIDES USING THE ADMIRALTY METHOD ON TWO RIVERS IN THE KUBU RAYA DISTRICT Azwa Nirmala; Qalbi Hafiyyan
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.
Application of Finite Difference Method in Simulating 2D Partial Dam-break Flow with an Obstacle Qalbi Hafiyyan; Azwa Nirmala; Murad MS; Sumiyattinah Sumiyattinah; Vivi Bachtiar; Muhammad Yusuf 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.
Co-Authors - Nurhayati Adityawan, Mohammad Bagus Arno Adi Kuntoro, Arno Adi Azwa Nirmala Hadi Kardhana Magdalena, Ikha Maitsa, Tias Ravena Marsudi, - Muhammad Yusuf Yusuf Murad MS Vivi Bachtiar