LiDAR DTM has been widely used for simulating flood inundation from river overflows. This flood inundation simulation needs to be done as an alternative step in the flood control system and flood disaster mitigation to determine the estimated area affected by the flood. Flood simulation is a form of unsteady flow that is simulated with the HEC-RAS program that allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling, and visualizes flooded areas and flood-affected areas using a geographic information system approach. Hydrological data is obtained from daily rainfall processing at the time of station rain. Hydrograph analysis was performed using the SCS CN model on the HEC-HMS software to estimate the flow rate and peak discharge. Watershed area, curve number, Impervious value, Initial Abstraction, and time lag are parameters that affect hydrograph analysis. From the results of the hydrograph analysis, the peak discharge of the model is 119.992 m2/s. Meanwhile, hydraulic analysis using HEC-RAS resulted in an inundation of 364 m2 which inundated three villages, namely Bulukerto, Bumiaji and Sidomulyo villages. The depth of the inundated area ranged from 0-15 m with an average depth of 4.534 m. The Sidomulyo area affected by the flood inundation scenario is 4,924 meters with an area of 0,02 ha. Bumiaji village was flooded with an area of 0,007 ha with a scenario of inundation depth of 4,049 m. Bulukerto village which was affected by the flood has an area of 20,972,832 m2 with a scenario of inundation depth reaching 4,343 m. Then some land cover such as residential land that is inundated by this flood simulation is 0,002 ha. Buildings from residential areas that were flooded reached 209 buildings. Then the area of agricultural land affected is 0,02 ha. In addition, there are also green open spaces affected by this simulation with an inundation area of 0,003 ha.
Print) C35 Abstrak-Pemanfaatan DTM LiDAR telah banyak digunakan terkait berbagai penerapan dalam simulasi genangan banjir dari luapan air sungai. Simulasi genangan banjir ini perlu dilakukan sebagai langkah alternatif dalam sistem pengendalian banjir dan persiapan mitigasi bencana banjir untuk mengetahui perkiraan area yang kemungkinan dapat terkena dampak banjir. Banjir yang disimulasikan merupakan salah satu bentuk aliran unsteady flow yang dapat disimulasikan dengan program HEC-RAS, serta melakukan visualisasi daerah genangan banjir serta area terdampak banjir menggunakan pendekan sistem informasi geografis (SIG). SIG juga digunakan untuk mempersiapkan beberapa data spasial yang digunakan untuk pemodelan banjir, seperti data geometri sungai, deliniasi daerah aliran sungai tutupan lahan serta jenis tanah selain itu untuk keperluan analisis spasial lainnya. Data hidrologis didapat dari pengolahan curah hujan harian pada stasiun hujan. Analisis hidfrograf dilakukan dengan menggunakan model SCS CN pada perangkat lunak HEC-HMS untuk memperkirakan debit aliran dan debit puncak yang terjadi disepanjang sungai. Luas DAS, curve number, nilai Impervious, Initial Abstraction, dan time lag merupakan parameter yang berpengaruh terhadap analisis hidrograf. Dari hasil analisa hidrograf tersebut menghasilkan debit puncak dari model adalah 119,992 m2/s. Sedangkan dari analisa hidraulika menggunakan HEC-RAS menghasilkan luasan genangan 364.288 m2 yang menggenangi tiga desa yaitu Desa Bulukerto, Bumiaji dan Sidomulyo. Untuk kedalaman dari area tergenang berkisar antara 0,0009-15,189 m dengan rata-rata kedalaman tersebut adalah 4,534 m.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.