Flash flood mitigation modeling — case study small Carpathians

Abstract

Flash floods are becoming a phenomenon that troubles people more and more often in many Slovak under-mountain regions and society needs to deal with these extreme natural events. This article is showing an example of mathematical modeling of flood protection measures in Small Carpathians region. To secure flood protection, detention reservoirs have been proposed, because of their automatic function that is important due to rapid progress of flash floods. As a base for this project a previous work that attempted to reconstruct the flood has been used. HEC-RAS 4.1.0 software package was used for numerical modeling, which includes flood mitigation calculation. Six variants of proposed detention reservoirs were created and checked by a design flood wave that was created according to rainfall with recurrence period of 100 years. All of the proposed detention reservoirs have exact proportions needed to secure flood protection including height of the dam, length of the dam in crest, type and dimension of outlet and dimensions of emergency spillways. The modeling included flood wave passing during several situations-normal function of detention reservoirs, blocked outlet and dam break. This study should be considered as a base for future flood protection project. An extensive terrain survey has been performed in frame of this project.

Hydrological-hydraulic assessment of proposed flood protection measures

“…Therefore, flood situations also occur in areas that previously were not affected by these HYDROLOGICAL-HYDRAULIC ASSESSMENT OF FLOOD PROTECTION 99 Pollack Periodica 14, 2019, 3 negative hydrological phenomena (flooding of the rural and the urban areas, cellars of the houses, etc. ), evident from previous solved projects [4]- [6].…”

An assessment of soil water erosion in the Myjava hill land: The application of a physically-based erosion model

“…The importance of detailed information about the characteristics of a rainfall are very important, i.e. an extreme rainfall event [24], [25], [26], [27].…”

A Stochastic Conflict Resolution Optimization Model for Flood Management in Detention Basins: Application of Fuzzy Graph Model

“…Although stochastic models ensure that certain levels of unpredictability and uncertainties exist in inflow hydrographs that pass through the detention basins, which are significant in combating the risks of floods [42][43][44][45], they have received little attention in the literature. Moreover, stochastic models are more beneficial for designing detention basins than deterministic models because they supplement uncertainties inherent in natural flood events since floods are stochastic processes [46][47][48]. Considering uncertainties inherent in the system, a commendable optimization algorithm, the so-called non-dominated sorting genetic algorithm-III (NSGA-III), can efficiently model complicated hydrological systems such as detention basins and their sub-structures during floods using efficacious uncertainty assessment techniques, namely conditional value-at-risk (CVaR) and non-linear interval number programming (NINP) approaches.…”