Hydraulic Computer Analysis of a River Sector Under Altered Flowing Regime Due to an Existing Bridge and Suggested Specific Correction Works

Autor: Albert Titus Constantin, Serban-Vlad Nicoara, Ioana Alina Popescu-Busan, Gheorghe I. Lazar
Rok vydání: 2019
Předmět:
Zdroj: IOP Conference Series: Earth and Environmental Science. 362:012148
ISSN: 1755-1315
1755-1307
DOI: 10.1088/1755-1315/362/1/012148
Popis: The paper presents a 2D numerical modelling of the water flow transit under an altered regime on Strei River, specifically for a 633m stretch influenced by a driveway crossing concrete structure of four gaps (about 71m total span) on a national road outside of Deva Town, Romania. The analysis considers a possible (and requested by specialised regulations) accidental highwaters flow development as assimilated from a specific hydrologic phenomenon that occurred on site during the special spring season of 2000. Taking into consideration the findings and general flow improvement suggestions of a technical expertise ordered by the rivers national administration, the present developed hydraulic model follows the technical recommendations of a formerly feasibility study with respect to streambed correction in the range of the mentioned bridge, specifically the downstream accomplishment of a bottom step (for scourings re-siltation) and two left side river groins (to direct the stream flow towards the central span of a following railway bridge, not covered by present model), accompanied by banks protection and alluvia deposits removing works. Under the given flow and geometry conditions, the study accomplished by the help of HEC-RAS 5.0.6 specialized software package looks to estimate the water surface level and velocity development in space and time, and so to draw the future state of flow transition along the analysed sector. As about the simulation output, the most important conclusions are that the riverbed would be able to discharge the significant flow of 0.1% overrunning probability at a maximum surface level below the structure safety values. In the same time, the reached velocity and particle tracking visualizations suggest a more stable and efficient riverbed time behaviour.
Databáze: OpenAIRE
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