黄河花园口—高村河段河槽断面冲淤变化特征及模型构建OA

To investigate the impacts of the Xiaolangdi Reservoir operation on channel erosion and deposition in the Lower Yellow River,this study utilized measured data from 2000 to 2020 in the Huayuankou-Gaocun reach.The flow-sediment driving factors of cross-sectional erosion-deposition characteristics were identified,quantitative flow-sediment-erosion-deposition response relationships were established,and a two-dimensional morphodynamic model was developed and validated for the study area.The results indicate that:a)The erosion-deposition characteristics at the control hydrological stations in the Huayuankou-Gaocun reach are governed by combined effects of multiple flow-sedi-ment factors rather than any single factor.b)During the flood season,cross-sectional erosion-deposition is significantly correlated with mean flow velocity and minimum incoming sediment coefficient,while during the non-flood season,it is significantly correlated with mean incoming sediment coefficient and mean erosion intensity,with coefficients of determination(R2)all exceeding 0.80.c)The model performs well in simulating flow-sediment transport,with a root mean square error of 0.17 m and a Nash-Sutcliffe efficiency of 0.93 for water level,and an RMSE of 2.10 kg/m3 and an NSE of 0.92 for sediment concentration.d)In terms of bed deformation,the mean absolute error of cross-sec-tional deposition thickness is 0.31 m,and the mean absolute relative error is 10.3%.The model also effectively reproduces the longitudinal continuity of the main channel,overcoming the discontinuities inherent in digital elevation models interpolated from discrete cross-sectional surveys.