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Analysis of the effect of regional lateral inflow on the flood peak of the Three Gorges Reservoir

Science China(Technological Sciences) 2011年第4期54卷 914-923页

作者： WANG BaiWei TIAN FuQiang HU HePing State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China

The Three Gorges Region(TGR),located at the lower reach of the Upper Yangtze River Basin(UYRB) in China,suffers from heavy rainstorm *** runoff generated from TGR composes an important part of the total flood at the famous Three Gorges Reservoir(TGRe).During the severe flood period in 1954,for example,the water from TGR accounted for up to 13.2% of the 30-days maximum flood volume of the *** the short and steep tributaries with rapid concentration,the regional lateral inflow(RLI) may induce more serious effect on the flood peak of the TGRe than the ***,hydrological data of the sparse gauge stations is too insufficient to evaluate the effect of *** paper studied the impact by analyzing 880 flood events during *** comparing the observed hydrograph and simulated hydrograph with HEC-RAS software regarding no RLI,the effect of RLI on flood peak value and timing properties was identified and *** variability of this effect among floods of different magnitudes was also *** evaluate the analysis uncertainty associated with the parameter of roughness coefficient,four sets of roughness coefficients from different research groups were employed in this *** results showed that RLI contributes discharge of 3524 m3/s to flood peaks of the TGRe on average,with the contribution ratio of 15.9%.RLI contributes 12000 m3/s to the flood peaks larger than 50000 m3/s on average,with 25000 m3/s as its upper bound,while the contribution ratio can reach up to 50%,with an average of 20%.The variability of this effect is great among different *** analysis showed that to larger flood peak of the TGRe,RLI contributes more discharge with higher variability,and the contribution ratio and its variability are slightly larger,and events with higher contribution ratio occur more *** can reshape the hydrograph,leading to earlier appearance of flood *** effect and its variability increase with the con

关键词： regional lateral inflow flood peak flood peak time HEC-RAS the Three Gorges

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