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Technical gazette, Vol. 28 No. 3, 2021.

Original scientific paper

https://doi.org/10.17559/TV-20200429024034

River Floodplain 1D/2D Hydraulic Modelling Combined with Recent LiDAR DTM Technology

Slobodan Kolaković ; Department of Civil Engineering, Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, 21000 Novi Sad, Serbia
Srđan Kolaković* ; Department of Civil Engineering, Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, 21000 Novi Sad, Serbia
Julius Fabian ; Department of Hydraulic, Water Resources and Environmental Engineering, Faculty of Civil Engineering Subotica, University of Novi Sad, Kozaracka 2/a, 24000 Subotica, Serbia
Goran Jeftenić ; Department of Civil Engineering, Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, 21000 Novi Sad, Serbia
Slaviša Trajković ; Faculty of Civil Engineering and Architecture, University of Nis, A. Medvedeva 14, 18 000 Nis, Serbia

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Abstract

The study presents problem of floods management for lowland rivers and provides solution for such complex task. The paper aims to elaborate a methodology for flood management model on large lowland rivers using precision digital terrain models (DTM) and combined 1D/2D unsteady flow model. The river Danube on the territory of Serbia was used with its tributaries for the development of the model. The length of the hydraulic model is 715 km and the achieved accuracy of the model, by comparing the calculated and observed levels on 10 water stations, is below 10 cm. Combined 1D/2D HEC-RAS model is adjusted by making use of the resulting high-resolution input. The ability of the combined 1D/2D model, based mainly on the high-accuracy input data, provides an accurate estimate of flood wave propagation. The result of this paper is a defined methodology providing sufficient accuracy to the hydraulic model of flood wave propagation in case of large lowland rivers, requiring acceptable short calculation time. Also, the methodology to specify relevant flood stage (design flood) which is used to determine levee crest elevation is developed in this paper.

Keywords

1D/2D hydraulic model; DTM; flood management

Hrčak ID:

258217

URI

https://hrcak.srce.hr/258217

Publication date:

6.6.2021.

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