PEMETAAN AREA GENANGAN BANJIR MENGGUNAKAN MODEL HEC-RAS 2D DAN SISTEM INFORMASI GEOGRAFIS PADA DAS BOGEL KECAMATAN SUTOJAYAN
DOI:
https://doi.org/10.51878/vocational.v6i2.9621Keywords:
Banjir, DAS Bogel, HEC-RAS, SIG, SutojayanAbstract
Sutojayan District in Blitar Regency, which is traversed by the Bogel River Basin (DAS), is an area that is highly vulnerable to flooding due to a combination of flat topography, extreme rainfall intensity, and massive land use changes. This study aims to map in detail the flood-prone areas in the Bogel Watershed as a structural mitigation effort. The research method uses a quantitative approach that integrates hydrological analysis in three Sub-DAS (Bacem, Lodoyo, and Judeg) with spatial hydraulic modeling using HEC-RAS 2D software and Geographic Information Systems (GIS) in various return period scenarios (Q2, Q5, Q10, Q25, Q50, and Q100). The results of the hydrological analysis show a significant increase in flood discharge as the return period increases, for example in the Bacem Sub-DAS from 69.28 m³/second (Q2) to 174.61 m³/second (Q100). Spatial modeling confirmed that the flood inundation area expanded from 4.98 km² in Q2 to 10.98 km² in Q100. The affected areas in the initial scenario included eight villages (Bacem, Jingglong, Kalipang, Kedungbunder, Pandanarum, Sutojayan, Sukorejo, and Sumberjo), and extended to Jegu and Kembangarum during the extreme return period. The main conclusion confirms that the integration of HEC-RAS and GIS has proven effective in predicting flood distribution accurately, making it crucial for use as a database for spatial planning and disaster mitigation in Sutojayan District.
ABSTRAK
Kecamatan Sutojayan di Kabupaten Blitar, yang dilalui oleh Daerah Aliran Sungai (DAS) Bogel, merupakan kawasan yang sangat rentan terhadap bencana banjir akibat kombinasi topografi datar, intensitas curah hujan ekstrem, dan masifnya perubahan tata guna lahan. Penelitian ini bertujuan untuk memetakan secara detail area rawan genangan banjir pada DAS Bogel sebagai upaya mitigasi struktural. Metode penelitian menggunakan pendekatan kuantitatif yang mengintegrasikan analisis hidrologi pada tiga SubDAS (Bacem, Lodoyo, dan Judeg) dengan pemodelan hidraulika spasial menggunakan perangkat lunak HEC-RAS 2D dan Sistem Informasi Geografis (SIG) pada berbagai skenario kala ulang (Q2, Q5, Q10, Q25, Q50, dan Q100). Hasil analisis hidrologi menunjukkan lonjakan debit banjir yang signifikan seiring bertambahnya kala ulang, misalnya pada SubDAS Bacem dari 69,28 m³/detik (Q2) menjadi 174,61 m³/detik (Q100). Pemodelan spasial mengonfirmasi bahwa luas genangan banjir berekspansi dari 4,98 km² pada Q2 hingga mencapai 10,98 km² pada Q100. Wilayah terdampak pada skenario awal meliputi delapan desa (Bacem, Jingglong, Kalipang, Kedungbunder, Pandanarum, Sutojayan, Sukorejo, dan Sumberjo), dan meluas hingga Jegu serta Kembangarum pada kala ulang ekstrem. Simpulan utama menegaskan bahwa integrasi HEC-RAS dan SIG terbukti efektif memprediksi sebaran banjir secara akurat, sehingga sangat krusial digunakan sebagai basis data tata ruang dan mitigasi bencana di Kecamatan Sutojayan.
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References
Agustian, F., Isfannir, I., Vikki, Z., Fadhilah, C., Mutasar, M., & Juanda, J. (2024). Sistem monitoring luapan air sungai berbasis IoT (Internet of Things) studi kasus Sungai Peudada Kabupaten Bireuen. Djtechno Jurnal Teknologi Informasi, 5(3), 637. https://doi.org/10.46576/djtechno.v5i3.5103
Akbar, M., M, A., & Mahmuddin. (2025). Analisis limpasan permukaan pada bagian hulu Sungai Pappa. Arus Jurnal Sains Dan Teknologi, 3(2), 183. https://doi.org/10.57250/ajst.v3i2.1350
Andiesse, V. W., Sutapa, I. W., & Tunas, I. G. (2025). Analisis debit air limpasan permukaan akibar perubahan tata guna lahan pada daerah aliran sungai bangga. Rekonstruksi Tadulako Civil Engineering Journal on Research and Development, 45. https://doi.org/10.22487/renstra.v6i1.700
Fadhil, S. N., Rachmawati, F., & Rahman, M. A. (2024). Manajemen risiko banjir pada masyarakat rentan. Jurnal Aplikasi Teknik Sipil, 22(2), 155. https://doi.org/10.12962/j2579-891x.v22i2.20038
Fajar, M. H. M., Rehananda, A., & Purnomo, S. E. (2024). Flood modeling for the Cisanggarung River in the Cilengkrang Village using the HEC-RAS software. Journal Of World Science, 3(12), 1648. https://doi.org/10.58344/jws.v3i12.1252
Farid, M., Dewi, N. T., Adityawan, M. B., Nugroho, E. O., Alhamid, A. K., Wahid, A. N., & Sihombing, Y. I. (2025). Flood hazard assessment and economic loss estimation based on rainfall-runoff-inundation model under design discharge scenario. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.5203997
Giyarsih, S. R. (2023). The impact of urban sprawl on the socioeconomic conditions of the population in Tamanan Village, Indonesia. Indonesian Journal of Geography, 55(1), 137. https://doi.org/10.22146/ijg.74137
Harifa, A. C., & Cahyani, K. N. (2024). Pemodelan 1D dan 2D Sungai Tukad Penet bagian hilir. Menara Jurnal Teknik Sipil, 20(1), 30. https://doi.org/10.21009/jmenara.v20i1.50103
Hidayat, Y., Rachman, L. M., Wahjunie, E. D., Baskoro, D. P. T., Purwakusuma, W., Yusuf, S. M., & Araswati, F. D. (2024). Water balance prediction by simulating land use planning and water retention infrastructure in Upper Cisadane sub-watershed, West Java, Indonesia. Jurnal Pengelolaan Sumberdaya Alam Dan Lingkungan (Journal of Natural Resources and Environmental Management), 14(2), 415. https://doi.org/10.29244/jpsl.14.2.415
Imaaduddiin, H. M., Kuntjoro, K., Sa’ud, I., Harijanto, D., & Indriyani, D. (2022). Pemanfaatan kolam tampung sebagai upaya mitigasi banjir kawasan pada sub sistem Medokan Ayu Kota Surabaya. Jurnal Aplikasi Teknik Sipil, 20(2), 243. https://doi.org/10.12962/j2579-891x.v20i2.12519
Indrawati, D., Ganguly, A. R., Taruc, K., & Yakti, B. P. (2021). Streamflow estimation using regionalized hydrometeorological assessment on associated ungauged small watershed: A case study at West Nusa Tenggara Province. Advances in Engineering Research. https://doi.org/10.2991/aer.k.211106.018
Kindhi, B. A., Lasminto, U., Triana, M. I., Damarnegara, S., & Anavatti, S. G. (2023). Sensor and internet of things based integrated inundation mitigation for smart city. International Journal of Power Electronics and Drive Systems/International Journal of Electrical and Computer Engineering, 13(3), 2695. https://doi.org/10.11591/ijece.v13i3.pp2695-2703
Moccia, B., Ridolfi, E., Mineo, C., Russo, F., & Napolitano, F. (2024). On the occurrence of extreme rainfall events across Italy: Should we update the probability of failure of existing hydraulic works? Water Resources Management. https://doi.org/10.1007/s11269-024-03852-6
Mustamin, M. R., Maricar, F., Lopa, R. T., & Karamma, R. (2024). Integration of UH SUH, HEC-RAS, and GIS in flood mitigation with flood forecasting and early warning system for Gilireng watershed, Indonesia. Earth, 5(3), 274. https://doi.org/10.3390/earth5030015
Palawa’ae, E. R., Hadiani, R., & Muttaqien, A. Y. (2024). Strategi mitigasi banjir berdasarkan kapasitas saluran drainase di Kelurahan Jagalan. Jurnal Riset Rekayasa Sipil, 7(2), 94. https://doi.org/10.20961/jrrs.v7i2.85901
Priatna, A., Surya, B., & Syafri, S. (2025). Analisis dampak perubahan penggunaan lahan terhadap potensi banjir pada daerah aliran sungai tallo. Urban and Regional Studies Journal, 7(2), 113. https://doi.org/10.35615/ursj.v7i2.6060
Ridwan, K. S., Sari, S. N., & Hermawan, A. (2025). Flood modeling of Telomoyo watershed in Kebumen using HEC-RAS for mapping flood risk zones. Jurnal Teknologi Terapan G-Tech, 9(2), 978. https://doi.org/10.70609/gtech.v9i2.6801
Sa’adah, U., Rochayani, M. Y., & Astuti, A. B. (2025). Indonesian Journal of Electrical Engineering and Computer Science. Indonesian Journal of Electrical Engineering and Computer Science. https://doi.org/10.11591/ijeecs
Setiawan, I. A., Aziz, S. K., Imaaduddiin, M. H., & Utama, W. (2025). Penerapan multi boezem dalam upaya pengendalian banjir di kawasan industri JIIPE Kabupaten Gresik. Jurnal Aplikasi Teknik Sipil, 23(3), 243. https://doi.org/10.12962/j2579-891x.v23i3.22652
Sharma, S., Lee, B. S., Nicholas, R. E., & Keller, K. (2021). A safety factor approach to designing urban infrastructure for dynamic conditions. arXiv. https://doi.org/10.1029/2021ef002118
Sholihah, L., & Irawanto, R. (2025). Identifikasi permasalahan dan pengelolaan Sungai Welang. EnviroUS, 5(2), 8. https://doi.org/10.33005/envirous.v5i2.337
Uca, U., Lamada, M., Nyompa, S., & Haris, N. A. (2022). Morphometry and topographic wetness index analysis for flood inundation mapping in Mata Allo watershed (South Sulawesi, Indonesia). Forum Geografic, 2, 133. https://doi.org/10.5775/fg.2022.105.d
Underwood, B. S., Mascaro, G., Chester, M., Fraser, A., López-Cantú, T., & Samaras, C. (2020). Past and present design practices and uncertainty in climate projections are challenges for designing infrastructure to future conditions. Journal of Infrastructure Systems, 26(3). https://doi.org/10.1061/(asce)is.1943-555x.0000567
Wesli, W. (2021). Kajian spasial dan partisipasi masyarakat sebagai upaya pengendalian banjir di Kabupaten Aceh Utara. Teras Jurnal Jurnal Teknik Sipil, 1(1). https://doi.org/10.29103/tj.v1i1.58
Wiwoho, B. S., & Astuti, I. S. (2022). Runoff observation in a tropical Brantas watershed as observed from long-term globally available TerraClimate data 2001–2020. Geoenvironmental Disasters, 9(1). https://doi.org/10.1186/s40677-022-00214-5
Yosua, H., Kusuma, M. S. B., & Nugroho, J. (2024). An assessment of pluvial hazard in South Jakarta based on land-use/cover change from 2016 to 2022. Frontiers in Built Environment, 9. https://doi.org/10.3389/fbuil.2023.1345894
Zhang, B., Wang, S., Moradkhani, H., Slater, L., & Liu, J. (2022). A vine copula?based ensemble projection of precipitation intensity–duration–frequency curves at sub?daily to multi?day time scales. Water Resources Research, 58(11). https://doi.org/10.1029/2022wr032658
