Modeling of Flooding of Settlements During the Spring Flood

Abstract

The problem of flooding of territories with flood waters for settlements of the Volgograd region is considered. A numerical model of flood water dynamics is constructed, taking into account the topography of the terrain. The simulation is based on two-dimensional shallow water equations. For computational experiments, a parallel implementation of the numerical scheme CSPH-TVD for NVIDIA graphics accelerators with CUDA technology is used. The digital model of the river-bed and floodplain relief is based on spatial data SRTM3 and SRTMGL, topographic maps of the area, longitudinal profiles of rivers. The water flow rates for the Buzuluk and Perevozinka rivers are determined and a hydrograph of the Volga hydroelectric power station is constructed for the given probabilities of exceeding the water level. Flood maps were obtained for the following localities: Novoannisky, Berezovka 1st, kh. Vyazovka. The maximum values of the depths for 1 %, 3 %, 5 %, 10 %, 25 % and 50 % of water security are presented. An analysis of the flood situation was carried out and appropriate engineering and protective measures for settlements were proposed. At maximum flood water levels, residential buildings of kh. Berezovka 1-I are not subject to flooding. In order to minimize the negative impact for the city of Novoanninsky, it is proposed to carry out timely clearing of the river-bed of the Perevozinka river from congestion. To protect from flooding ch. Vyazovka it is recommended to use diversion dyke.

The Problem of Effective Evacuation of the Population from Floodplains under Threat of Flooding: Algorithmic and Software Support with Shortage of Resources

“…The model is based on shallow water equations [34][35][36]75] and has already been used to solve a wide range of problems related to modeling the hydrological regime as the Northern part of the Volga-Akhtuba Floodplain (NPVAF) and other river systems. This numerical model became the basis for the creation of flood cadastral maps [24], decision-making systems for the socio-economic development of floodplain territories [25], and the implementation expertise of various engineering projects [76].…”

“…Such water objects are the floodplains of large lowland rivers regulated by hydroelectric dams. Therefore, floodplains pose a serious danger to the life of the population during spring floods or heavy rainfall [15,[24][25][26][27]. The effects of flash floods in urban areas are more severe.…”

“…Finally, since the most important component of evacuation modeling is a hydrodynamic model for forecasting the hydrological regime of a flooded area, we point out the current results of such computer modeling for various water systems [12,16,17,21,23,33,38,71,72]. Modeling of floods near rivers has shown its effectiveness for constructing cadastral maps of water supply [24,36,73]. Numerical models of water dynamics make it possible to better understand the mechanisms of occurrence of catastrophic consequences of floods, for example, for the tragedy in Krymsk (Krasnodar region, Russia) in 2012 [21].…”

“…Hydrodynamic models of such events describe well the dynamics of water level rise [8,17,37,74]. Separately, we single out a series of works devoted to the study of the hydrological regime of the Volga-Akhtuba Floodplain (VAF) during the spring flood, since the VAF is the testing ground for our study [24,25,[75][76][77][78].…”

Method for Constructing Cadastral Maps of Flooding of River Valleys Based on Hydrodynamic and Geoinformation Modeling

“…На основе полученной информации определяются соотношения величины обеспеченности и объемного расхода водных объектов [5]. Обеспеченность гидрологической величины -это вероятность того, что рассматриваемое значение гидрологической величины может быть превышено среди совокупности всех возможных ее значений [1]. Для проведения гидродинамического моделирования важной характеристикой является обеспеченность расхода рек, так как эта величина используется в качестве начальных параметров при проведении вычислительного эксперимента.…”