RUNOFF SIMULATION THROUGH THE NON-PERMANENT ACCUMULATION CIUREA USING HEC-RAS 2D
RUNOFF SIMULATION THROUGH THE NON-PERMANENT ACCUMULATION CIUREA USING HEC-RAS 2D

Summary/Abstract: The paper presents the way of construction a model to simulate the runoff on the Nicolina river, through the non-permanent accumulation Ciurea, Iaşi County. HEC-RAS 2D software was used to create a hydraulic model with detailed two-dimensional unsteady flow river hydraulics calculations on the channel and floodplain. We used gridded data for terrain modeling and a Landcover data layer in the RAS Mapper module, to associate with a specific geometry input file, and a specific results output file. The Storage Area of the basin was defined by an elevation-volume curve. The Boundary conditions were set as outflows from Ciurbeşti and Ezăreni reservoirs, situated on the tributaries and a downstream flow measured at Ia i hydrometric station. The simulated event was the flood corresponding to a near 10% probability of exceedance, that produced on the River Nicolina in July 2013. HEC-RAS 2D software generates results in bidimensional hydrodinamic files that highlights the flow, speed, water level and space expansions of the flooded areas. The bidimensional model is calibrated with reference terms of the measured water level in the modeled area, the maximum limit of the hystorical flood recorded by physical landmarks.

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