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All Journal Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Jurnal Kacapuri : Jurnal Keilmuan Teknik Sipil Publikasi Riset Orientasi Teknik Sipil (Proteksi)
Nilna Amal
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Transportation

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PENGARUH DISTRIBUSI HUJAN TERHADAP PERHITUNGAN DEBIT BANJIR PADA DAERAH RAWA DAS MARTAPURA Amal, Nilna; Wiranata, Hendra Aji
Jurnal Kacapuri : Jurnal keilmuan Teknik Sipil Vol 6, No 2 (2023): Vol 6, No 2 (2023 JURNAL KACAPURI : JURNAL KEILMUAN TEKNIK SIPIL (Edisi Desember
Publisher : Universitas Islam Kalimantan Muhammad Arsyad Al-Banjari Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/jk.v6i2.12965

Abstract

Intensitas hujan yang terjadi terdistribusi dengan durasi yang berbeda dan distribusi ini dapat menjadi penentu dan pembeda besaran dan lamanya debit puncak yang terjadi. Distribusi hujan seharusnya ditemukan melalui pengamatan di lapangan melalui alat-alat ukur hujan otomatis. Untuk daerah yang tidak terdapat data hujan otomatis, terdapat beberapa jenis distribusi hujan yang diusulkan untuk menggantikan distribusi hujan aktual. Dalam penelitian ini dipilih distribusi hujan metode Mononobe dan Alternating Block Method (ABM). Penelitian ini dimaksudkan untuk melihat perbedaan penggunaan jenis distribusi terhadap besaran dan lamanya debit puncak dan lamanya mencapai waktu puncak dengan menggunakan aplikasi komputer HEC-HMS. Metode analisis dilakukan dengan melakukan simulasi terhadap hujan aktual pada waktu di mana dilakukan penelitian terdahulu oleh peneliti lain untuk menggunakan formula yang diusulkan oleh penelitian sebelumnya. DAS Martapura dibagi menjadi dua sub DAS yaitu sub DAS Riam Kiwa dan sub DAS Riam Kanan. Analisis dilakukan untuk memodelkan volume dan debit aliran melalui metode transormasi hidrograf satuan SCS dan model loss yaitu Curve Number untuk setiap distribusi Mononobe dan ABM. Debit banjir rencana hasil simulasi pada berbagai kala ulang menunjukkan bahwa perbedaan besaran intensitas tidak menyebabkan perubahan terhadap waktu mencapai puncak. Perbedaan intensitas menentukan perbedaan besaran debit maksimum yang mencapai hingga 30%.sebagaimana ditunjukkan oleh debit puncak pada distribusi ABM kala ulang 2 tahun sebesar 15.770 m3/s  terjadi pada jam ke 5, sedangkan pada distribusi Mononobe intensitasnya sebesar 12.113 m3/s terjadi pada jam ke 3.Perbedaan pola distribusi tidak hanya menyebabkan perubahan durasi aliran puncak namun juga menyebabkan perbedaan besarnya aliran puncak. Studi lebih lanjut mengenai distribusi curah hujan aktual diperlukan untuk lebih mendukung kesimpulan tentang pola distribusi empiris.lebih cocok diaplikasikan di daerah aliran sungai Martapura.
Analisis Neraca Air Sesuai Pola Tanam Eksisting Padi Lokal pada Daerah Irigasi Rawa (DIR) Antasan Sutun Kabupaten Banjar Amal, Nilna; Wulandari, Rizki Ayu
PUBLIKASI RISET ORIENTASI TEKNIK SIPIL (PROTEKSI) Vol 6 No 1 (2024): Vol. 6 No.1 (2024)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/proteksi.v6n1.p94-101

Abstract

The Antasan Sutun Swamp Irrigation Area (DIR), which is located in Sungai Tabuk, South Kalimantan Province, is the source of water for local agricultural land that covers a rice field area of 737.8 Ha. Local farmers have implemented a once-a-year cropping pattern, but there is a need for more water during the dry season. Therefore, this study aims to analyze the amount of availability compared to water demand based on existing cropping patterns. The research method was carried out by analyzing the need and availability of water with a water balance model. Potential evapotranspiration is calculated using the Penman Modification method. The availability of water is calculated using the mock method. The results showed that the maximum water demand discharge was 1.09 m3/sec in March II and a minimum of 0.19 m3/sec in July II. The results of the availability discharge with a maximum mainstay discharge (Q80) of 2.11 m3/sec in January I and a minimum discharge in October II of 0.19 m3/sec. The result showed that all of the moths are water surplus, meaning that the water available in DIR Antasan Sutun can meet the needs of agricultural land with the planting period that the community uses
ANALISIS DEBIT BANJIR PADA SUB DAERAH ALIRAN (DAS) SUNGAI TABUK, PERBANDINGAN METODE HIDROGRAF SATUAN SINTETIK SCS DAN SNYDER Amal, Nilna; Haliza, Noor
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 30 No. 2 (2025): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

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

Abstract

Floods are a natural disaster that can occur during the rainy season in various watershed areas across many regions of Indonesia. Continuous heavy rainfall causes rivers to exceed their capacity, leading to flooding. The Sungai Tabuk sub-district, which comprises 20 villages and one urban village, is entirely affected by flooding, with the worst-hit area being Pemakuan Darat Village. To determine the magnitude of the flood discharge, a hydrological model simulation using the HEC-HMS software is necessary. The analysis was conducted by collecting data on the Sub-basin of Sungai Tabuk, which includes primary and secondary data. The data was processed to create a rainfall-runoff model using HEC-HMS. The rainfall distribution process was carried out using the Mononobe distribution. The method used is the SCS Curve Number, while direct runoff is analyzed using the HSS SCS and the HSS Snyder. The simulation results with observations dated January 1, 2021, using the Mononobe distribution method by SCS and Snyder, are as follows: the SCS method at the outlet Reach and Sink had the highest discharge of 1,430.2 m³/s, whereas the Snyder method had a discharge of only 1,092.3 m³/s. In contrast, the discharge observed in the field was 39.072 m³/s. It can be seen that the discharge values from the HEC-HMS software are significantly higher than the discharge values obtained in the field.
ANALISIS DEBIT BANJIR PADA SUB DAERAH ALIRAN SUNGAI (DAS) TABUK, PERBANDINGAN METODE HIDROGRAF SATUAN SINTETIK (HSS) SCS DAN SNYDER Amal, Nilna; Haliza, Noor
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 30 No. 2 (2025): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v30i2.7247

Abstract

Floods are a natural disaster that can occur during the rainy season in various watershed areas across many regions of Indonesia. Continuous heavy rainfall causes rivers to exceed their capacity, leading to flooding. The Sungai Tabuk subdistrict, one of the rice product areas, was also affected by flooding, which will disturb rice production. This research aims to compare two methods for calculating a design flood using proper software, which has not been found in previous studies in this area. We chose a hydrological model simulation using the HEC-HMS software to determine the magnitude of the flood discharge. The data was collected by two processes: field research for primary data and data received from other institutions for secondary data. The data was analyzed by comparing two methods available in the software: the SCS and the Snyder unit hydrograph (HSS), and it was processed to create a rainfall-runoff model using both of them. The simulation results with observations dated January 1, 2021, using the Mononobe distribution method by SCS and Snyder, are as follows: the SCS method at the outlet had a higher discharge: 974,4 m³/s, whereas the Snyder method had a discharge of only 957,5 m³/s. The differences in the results can be attributed to the differences in the parameters and calculation methods. In contrast, the discharge observed in the field was 39.072 m³/s. It can be seen that the discharge values from the HEC-HMS software are significantly higher than the discharge values obtained in the field, because the discharge was a regular flow instead of a design one. A further study that can reveal why the difference was relatively high and how to overcome the problem is needed.
Co-Authors Haliza, Noor Wiranata, Hendra Aji Wulandari, Rizki Ayu