摘要
沙河复航工程在漯河市推荐线上存在桥梁净空低于IV级通航标准,桥孔内局部水流流速超过设计要求,不满足通航水流条件的情况,需要对航道内的碍航桥梁进行改建。本文运用Mike软件建立沙河漯河市境内从上游泰山路彩虹桥下约200m,到下游黄河路沙河桥下约500m的京广铁路桥上下游河段的平面二维水沙数学模型,并根据实测设计洪水、最高通航水位和最低通航水位推求模型在漯河水文站的水位,与实测漯河水文站的水位进行对比,检验模型的适用性。利用所建立的平面二维水沙数学模型,对设计方案下航道内京广铁路桥桥墩附近流场、航道内水面线比降、航道内水流流速进行数值模拟计算,分析模拟河段的通航水流条件。计算分析表明,设计最高通航水位和设计最低通航水位情况下,京广铁路桥桥墩附近流场流速、航道内水面比降和横纵向流速均减小,设计主航道的水流条件符合IV级通航标准。
The navigation project of Shahe river in Luohe city is recomended that the clearance of the bridges along the line should be lower than level-IV navigation standards. Local flow velocity within bridge openings exceeds the design requirements, which can not meet the navigable flow conditions. Therefore, it is necessary to rebuild the bridges in the waterway that block the navigation. In this paper, we used the Mike software to establish the plane 2D water-sand mathematical model of Shahe river section of Beijing Guangzhou railway bridge, which is located in Luohe, Taishan road, rainbow bridge under about 200m, the lower reaches of the the Yellow river road, Shahe bridge under about 500m, and according to the actual design flood, the highest navigable water level and lowest navigable water level push model in Luohe hydrological station water level, which is compared with measured water level and test the model applicability. We also used the mathematical model to perform the numerical simulation calculations for the flow fields close to the piers of various bridges, water line ratio drop within the waterway, and flow velocity within the waterway in the design plan, and analyzed the navigable flow conditions in the river section. The calculations and analysis showed that the flow field near the piers, wator surface slope in the waterway, and horizontal and vertical velocities were reduced under the designed highest navigable water level and the designed lowest navigable water level, and the water conditions in the designed main waterway met the level-IV navigation standard.
基金
郑州市创新型科技领军人才项目(121PLJRC527)
关键词
IV级通航标准
平面二维水沙数学模型
通航水流条件
level-IV navigation standards
the plane 2D water-sand mathematical model
the navigableflow conditions
