Abstract
The paper presents the result of research on simulating the flooding of a flood on a stretch of river located in an urban area. The study area was located on the section of the Trotuș River that crosses the city of Comănești, Bacău County. The simulation was performed with the HecRas program for several scenarios differentiated by the value of the transit flows (Q1%, Q2%, Q5% și Q10%,). In order to apply the simulation program, it was necessary to carry out complex studies such as topographic, hydrological, hydraulic, how to equip the river with regularization works, the constructive characteristics of the works, etc. The presence of the riverbed regularization works modifies locally flood parameters and implicitly the parameters of the flood band. The simulation highlighted the positive, but also negative, cooperation of the arranged and unarranged river sectors with regularization works for the formation of the flood band. Also, the simulation highlighted the need to rehabilitate the existing regularization works, but also the need to carry out new works.
Highlights
The change at European level of the concept of regularization of watercourses, determined by the excessive influence of the hydroclimatic risk factors, imposed changes in the way of designing and realizing the constructions from the riverbed and the riparian zone of the rivers
The Trotuş River basin has become representative for the presence and frequency of rapid floods
The flood limit obtained by simulating the river sector with regularization works at the maximum flow with the probability of 1% was reduced by about 17 - 20% compared to the one calculated 12 years ago
Summary
The change at European level of the concept of regularization of watercourses, determined by the excessive influence of the hydroclimatic risk factors, imposed changes in the way of designing and realizing the constructions from the riverbed and the riparian zone of the rivers. This is how the concept of „green regularization” came about. Water Directive 2000/60 and C.E. and the legislation of the Romanian government emphasize the concepts of „continuous river” and „more space for rivers” (Avram, 2020) In this concept, the technical solutions for the design and execution of hydrotechnical works for the arrangement and rearrangement of watercourses must be legislated. The Trotuş River hydrographic basin located in the piedmont area of the Eastern Carpathians and near the peripontic territory, is an area suitable for the manifestation of the corroboration between the hydroclimatic risk factors with the anthropic ones
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