Numerical Simulation of Sediments Transport AO a River Sector as Distorted by a Crossing Structure

Autor: Gheorghe I. Lazar, Serban-Vlad Nicoara, Ioana Alina Popescu-Busan, Albert Titus Constantin
Rok vydání: 2019
Předmět:
Zdroj: IOP Conference Series: Earth and Environmental Science. 362:012149
ISSN: 1755-1315
1755-1307
DOI: 10.1088/1755-1315/362/1/012149
Popis: The paper presents a 1D numerical modelling of sediments transit on Someș River downstream of its confluence with Agrij tributary, specifically for a 352 m sector affected by a driveway crossing bridge right outside of Jibou Town building area, about 25 km from Zalău Municipality in the North-West of Romania. There was considered a quasi-transitory flow regime as assimilated from a three years data available period of time, i.e. from August 1st, 1985, to July 31st, 1988. As considering the on-site findings and concluding general riverbed restoration suggestions of a technical expertise ordered by the Rivers National Administration, the performed numerical model comes in support of the technical solutions stipulated by a feasibility study conducted by the authors with respect to streambed balance achievement in the range of the mentioned bridge. Specifically, the following main interventions were implied: the accomplishment of a downstream bottom step to break the general scouring phenomenon in the structure vicinity and to produce the re-siltation of the central gaps, and the execution of two upstream river groins designated to lead the flow and carried alluvia towards the bridge central area. Thus, the numerical simulation performed by the help of HEC-RAS 5.0.6 specialized software package looks to establish the optimum location and geometry for the bottom step as correlated with bridge area re-siltation and general scouring on the modelled river sector. Specific structural results and flow parameters outcome – water surface level and velocity development – together with important general sediments transport information (e.g. flexible streambed configuration evolution) was concluded from the reached graphical output.
Databáze: OpenAIRE
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