Abstract
The use of the Mike11 one-dimensional (1D) hydraulic model, together with official hydrology, represents a standard approach of the National Water Management Authority (NWMA) in Poland for flood mapping procedures. A different approach, based on the hydrological Event-Based Approach for Small and Ungauged Basins (EBA4SUB) model and the Flood-2 Dimensional (FLO-2D) hydraulic model has here been investigated as an alternative procedure. For the analysis, two mountainous rivers in Poland were selected: Kamienica Nawojowska is characterized by a narrow valley, while Skawinka has a broad valley. It was found that the flood zones can enormously differ locally, with larger zones generated by the Mike11/NWMA model in some cases and by the EBA4SUB/FLO-2D model in other situations. The benefits of using the two-dimensional (2D) model are consistent in areas without drainage and where the connection to the main channel is insufficient. The use of 1D modeling is preferred for the possibility of mapping the entire river network in a short computational time.
Highlights
Floods are a natural phenomenon that occurred in the past and that will be repeated in the future
The dynamics of changes in maximum annual flows remained at a high level, which was evidenced by Bthaseedcooneffitheciresnutltos fsuvmamriaartiizoedn.inTThabeleco1,eitffiwcaisefnoutsndotfhvatatrhieadtiioffnersenfcoers baentwaleyeznemdinciamtucmhments are strongly realnadtemdatxoimtuhme hobigsehrvvedarainanbuilailtmy aoxfimmuamxifmlowumwaps r9e4c%ipfoitraKtiaomnie, nwicha iNchawhoajoswasnkaeannodrm96%oufosrimpact on flooding
FigureE3B.A(A4S) UFlBo/oFdL-Opr-o2Dne areas;Bt(h5e;2K) amienica Nawojo7w33sk,5a2R5 iver—Flood-2 Dimensional (FLO-2D): (a) B2(,20;924),8(7b5) B(2;3), (c) DVWK. (B) Flood-prone ar22e,a01s64;58t,73h20e50Skawinka River—model FLO-2D: (a) B(2;2), (b) B(2;3), (c) DVWKe. 1(C1/)NFWlooMdA-prone aSrCeaSs-;CMNike11/National Water Management Authority (NWMA): (a1),1K56a,m40ie0nica Nawojowska, 2(b,3)8S0k,2a7w5inka
Summary
Floods are a natural phenomenon that occurred in the past and that will be repeated in the future. The National Security System (ISOK) has the necessary task to provide an effective system for protecting the country from extraordinary hazards, which is essential due to the growing number of such events and the increasing scale of their economic and social impact. Following this task, flood hazard management plans were developed for the majority of catchments in Poland, mainly the ones having discharge gauging stations, allowing local authorities to make decisions about the identification of flood hazard zones
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