Simulation of Flood in Three Gorges Region Based on HEC-HMS Model
The Three Gorges Interval(TGI)accounts for 5.6％of the upper Yangtze River basin area.However,floods originating from this region constitute over 10％of the floods in the Three Gorges Reservoir(TGR).Hence,heavy rainfall-induced flood is an important factor that must be taken into consideration in ensuring reservoir flood control safety.Based on TGR inflow data during 2007-2011 and flow data from upstream Cuntan and Wulong sta-tions,we developed a HEC-HMS flood simulation model to examine the correlation between rainstorm floods in the TGI and inflow floods into the reservoir.We proposed an interval flood modeling scheme based on classified parame-ter adjustment and staged testing according to flood sources:for floods primarily driven by upstream inflows,the flood confluence parameters were calibrated;for floods predominantly influenced by regional precipitation,the flow yield parameters were calibrated.To validate the model,we compared simulated flood processes post-2012 with op-erational records of the TGR,demonstrating model accuracy with the relative errors of peak flow rate in calibration and verification periods within±20％and peak time errors below 3 hours.Comparisons with Three Gorges Project(TGP)operation records confirmed the model's suitability for simulating post-2012 TGR flood processes.Exami-ning the flood event on June 26,2016,as a representative case,we observed a significant 27.2％contribution rate of flood peak within the reservoir,with a peak time advance of 16 hours.These findings facilitate understanding TGR flood impacts and serve as a technical reference for flood modeling schemes within the basin region.
Three Gorges regionflood process simulationHEC-HMS modelparameter calibration
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