Flood Modeling of Telomoyo Watershed in Kebumen Using HEC-RAS for Mapping Flood Risk Zones
DOI:
https://doi.org/10.70609/gtech.v9i2.6801Keywords:
Flooding, Telomoyo watershed, HEC-RASAbstract
Flooding is a frequent natural disaster in Indonesia, especially in areas with low topography and high rainfall. The Telomoyo watershed in Kebumen Regency, with an area of 553.22 km², faces a high risk of flooding even though its water flow is controlled by the Sempor Reservoir. Geographical conditions, topography and high rainfall in the upstream area often cause inundation in the downstream area. This study modeled the flood potential in the Telomoyo watershed using HEC-RAS software, based on rainfall data and a Digital Elevation Model (DEM). The methodology includes hydrological analysis to determine peak discharge using the Nakayasu Synthetic Unit Hydrograph (HSS) method and hydraulic analysis to map flood-prone areas. The results showed that the combination of rainfall and topographic data resulted in accurate mapping of flood-prone areas. The peak discharge of the 25-year return period reached 986.177 m³/second, with inundation up to a depth of more than 3 meters in certain areas. Integration of satellite rainfall data from NASA's Giovanni with 2D hydraulics modelling based on HEC-RAS, which produced flood risk maps for the Telomoyo watershed with a high level of accuracy that was previously under-explored. The outcome of this research for flood management in the Telomoyo watershed is the provision of a scientific basis for more effective mitigation strategies, such as strengthening drainage infrastructure, and risk zone-based spatial planning. This information can be used as a basis for more effective flood mitigation planning and risk management in the Telomoyo watershed area.
References
Anggraheni, E., Sutjiningsih, D., Mulyono, B. H., Guswanto, Ningrum, I. A., & Yahya, D. M. (2022). Pengaruh Sebaran Spasial Hujan terhadap Pemilihan Metode Hujan Wilayah Berbasis Analisis Geospasial. Jurnal Teknik Sumber Daya Air, 81–92. https://doi.org/10.56860/jtsda.v2i2.41
Anis-Athirah, B. N. (2021). Delineation of flood-prone areas using Digital Elevation Model (DEM) in Kuala Krai, Kelantan. IOP Conference Series: Earth and Environmental Science, 842(1). https://doi.org/10.1088/1755-1315/842/1/012045
Astuti, dkk. (2018). Analisis Penanggulangan Banjir Sungai Kanci. Jurnal Kronstuksi UNSWAGATI CIREBON, 7(3).
Bashori, S., & Purwono, N. A. S. (2024). PEMODELAN LUAPAN BANJIR DAS LUKULO MENGGUNAKAN APLIKASI HEC-RAS. Jurnal Ilmiah Teknik Mesin, Elektro Dan Komputer, 4(1), 13–27. https://doi.org/10.51903/juritek.v4i1.2843
Chaidir A. (2023). Peningkatan Kewaspadaan Warga Terhadap Banjir Melalui Penerapan Alat Pemantau Ketinggian Air di Aliran Sungai Kalijompo Kabupaten Jember. VIVABIO: Jurnal Pengabdian Multidisiplin, 5(2), 52–57. https://doi.org/10.35799/vivabio.v5i2.46349
Dewi, S. (2018). Menentukan Distribusi Representatif Frequensi Curahan Hujan Harian Maksimum Dengan Metodehistogram Dan Metode Parametik Di Provinsi Sumatera Barat. 1. http://jurnal.usu.ac.idindex.php/agroekoteknologi/article/view/58
Harsritanto, B. I. R., & Roesmanto, T. (2017). STUDI PENDAHULUAN STREETSCAPE YANG MERESPON BENCANA. http://ejournal.undip.ac.id/index.php/modulstudipendahuluanstreetscapeyangmeresponbencana
Hengkelare, S. H., & Rogi, O. H. (2021). MITIGASI RISIKO BENCANA BANJIR DI MANADO. Jurnal Spasial, 8(2), 2021.
Mardikaningsih, S. M., & Muryani, C. (2017). Studi Kerentanan dan Arahan Mitigasi Bencana Banjir di Kecamatan Puring Kabupaten Kebumen Tahun 2016. Jurnal Geo Eco, 3(2).
Nugraha, A. L. (2018). Peningkatan Akurasi dan Presisi Analisa Spasial Pemodelan Banjir Kota Semarang Menggunakan Kombinasi Sistem Informasi Geografis Dan Metode Logika Fuzzy. TEKNIK, 39(1), 16–24. https://doi.org/10.14710/teknik.v39n1.xxxxxx
Nugrahanto, B. A., & Limantara, L. M. (2022). Evaluasi Rasionalisasi Pos Hujan dengan Metode Stepwise dan Standar WMO pada DAS Telomoyo Kabupaten Kebumen. In Jurnal Teknologi dan Rekayasa Sumber Daya Air (Vol. 2, Issue 2). https://jtresda.ub.ac.id/
Nuzul, M., Achmad, M., & Soma, A. S. (2021). Analisis Genangan Banjir Akibat Debit Puncak di DAS Baubau Menggunakan HEC-RAS dan GIS. Jurnal Pembangunan Wilayah Dan Kota, 17(2), 192–206. https://doi.org/10.14710/pwk.v17i2.34152
Pasir, I. W. (2017). ANALISA PENAMBAHAN DEBIT AIR DENGAN SISTEM EMBUNG DI SEKITAR DAERAH KECAMATAN RENDANG KABUPATEN KARANGASEM. In Jurusan Teknik Gradien (Vol. 9, Issue 2).
Pratiwi, D. W., & Satria Negara, A. (2023). Perbandingan Pola Distribusi Hujan Terukur dan Metode Empiris dalam Perhitungan Debit Banjir Rencana DAS Jurug. Jurnal Teknik Sumber Daya Air, 29–42. https://doi.org/10.56860/jtsda.v3i1.55
Pratiwi, Z. N., & Santosa, P. B. (2021). Pemodelan Banjir dan Visualisasi Genangan Banjir untuk Mitigasi Bencana di Kali Kasin, Kelurahan Bareng, Kota Malang. JGISE: Journal of Geospatial Information Science and Engineering, 4(1), 56. https://doi.org/10.22146/jgise.56525
Rahmadhani, D. A., Hermawan, A., & Ardian, O. H. (2024). ANALISIS BANJIR DI SUNGAI COKROYASAN BAGIAN HILIR.
Rustanto, A. (2021). Sustainable Livelihood Approach Farming Communities in Temoloyo River Basin, Kebumen Regency.
Triatmojo, B. (2008). Hidrologi Terapan (Ediisi Pertama). Beta Offset.
Wahyuni, S. (2019). PEMBELAJARAN RAIN WATER HARVESTING PADA MATA PELAJARAN BIOLOGI SEBAGAI UPAYA MITIGASI BENCANA BERBASIS KEARIFAN LOKAL. Jurnal Pendidikan Biologi, 10(2), 74. https://doi.org/10.17977/um052v10i2p74-84
Wigati, R. (2020). Integrasi HEC-RAS dan GIS dalam floodplain mapping Sungai Cilemer HM 53+00 – HM 105+00. Teknika: Jurnal Sains Dan Teknologi, 16(2), 171. https://doi.org/10.36055/tjst.v16i2.9134
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