宿连航道穿越新沂河段整治方案与效果模型试验研究OA

The Suqian-Lianyungang Waterway,a vital component of Jiangsu Province's trunk waterway net-work which is planned as Class Ⅱ,traverses the Xinyi River over a long distance.During flood seasons,con-centrated crossflows in the Xinyi River over the planned navigation channel create strong transverse currents,significantly restricting navigation duration and safety.Based on field hydrological and topographic measure-ments,a comprehensive physical model was established with plane scale 1∶200 and vertical scale 1∶80.To address the challenging flow dispersion at the confluence zone under maximum navigable discharge condition(2710 m3/s),with the target of maintaining transverse velocities below 0.5 m/s within the channel,the regula-tion measures of expansion dredging,channel widening,sluice gate expansion and flow guidance were pro-posed.After comparative analysis,a 25° expansion angle was proven to be optimal for flow dispersion and re-duction of transverse current,thus forming the comprehensive regulation scheme.Using properly scaled sedi-ment,sedimentation tests demonstrated that water rapidly crosses the expanded zone and navigation channel experiences minimal sediment redeposition under typical annual flow-sediment conditions.During hydrological-ly unfavorable years,targeted maintenance dredging can adequately preserve both the regulation effectiveness and requisite navigation depths.