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All Journal REKAYASA Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Jurnal Kacapuri : Jurnal Keilmuan Teknik Sipil Publikasi Riset Orientasi Teknik Sipil (Proteksi)
Nilna Amal
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics 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 | DOI: 10.32497/wahanats.v30i2.6890

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 Pengaruh Tata Guna Lahan Terhadap Perubahan Karakteristik Hidrograf Banjir di Sub DAS Sungai Negara Kota Amuntai Awaludin, Muhammad Syahli Roby; Amal, Nilna
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.31612

Abstract

Seasonal flooding in Amuntai City, located in the downstream area of the Negara Sub-watershed, has become increasingly frequent, with land-use change identified early as one of the main contributing factors. This study aims to model flood hydrographs under the land-use conditions of 2006, 2015, and 2022, and to analyze the impact of land-use conversion on the characteristics of flood hydrographs. The modeling was carried out using HEC-HMS with rainfall inputs distributed hourly using the Mononobe Method and the Alternating Block Method (ABM). Hydrological parameters, including Curve Number (CN), initial abstraction, and imperviousness, were obtained through spatial analysis using QGIS. The results indicate that land-use change has a direct influence on the hydrological response of the sub-watershed, as reflected by an increase in peak discharge from 115.9 m³/s in 2006 to 120.8 m³/s in 2015 (a 4.23% rise), and a more substantial increase to 136.4 m³/s in 2022 (a 12.91% rise from 2015, or 17.7% from 2006). In addition, acceleration of the time to peak (Tp) and shortening of the time base (Tb) were observed, indicating increased surface runoff due to reduced soil infiltration capacity as built-up areas expanded. These findings affirm that land-use conversion significantly contributes to heightened flood vulnerability in downstream areas. This study also highlights the need for more complete observational hydrograph data to enhance model accuracy in future research, and encourages the use of alternative modeling to obtain more comprehensive insights in support of sustainable watershed management strategies.
Co-Authors Awaludin, Muhammad Syahli Roby Haliza, Noor Wiranata, Hendra Aji Wulandari, Rizki Ayu