摘要
受采砂影响,磁河河道出现较大地形变化,河道行洪条件发生了改变,常规的一维计算方法很难真实的反映出河道的水文情况。MIKE21数学模型属于平面二维表面流数学模型,广泛用于河流等二维水力学问题研究。利用磁河新测地形图建立二维水流数值模型,对南水北调中线磁河渠道倒虹吸处河道水文成果进行复核,并与初步设计成果进行对比分析;并按照复核的水文成果,从不同角度对倒虹吸的防洪安全进行评价。结果表明,采砂坑对洪水水位影响较小,但会加剧河道冲刷;分析认为,倒虹吸防洪安全存在隐患。建议采取防护措施,加强防护,对工程防洪度汛安全和运行安全具有重要意义。
Influenced by sand mining,there is a larger terrain changes in the Cihe river course,the flood conditions have been changed,and the hydrological condition of the riverway can not be good to reflected by the conventional one-dimensional calculation method.The MIKE-1 mat hematical model belongs to a two-dimensional surface flow mathematical model,widely used in rivers and other two-dimensional hydraulic problems.A-D numerical model of water flow is established by using the new topo-graphic map of Cihe River,hydrographic results of Cihe invert ed siphon at the middle route of the South-to-North Water Trans-fer project are reviewed,And compared and analyzed with the preliminary design results.The results show that the sand pits have little influence on flood water level,but it will exacerbate the river channel erosion.Analysis considers,there is a risks of flood control safety in inverted siphon.It is suggested that prot ective measures should be taken to strengthen protection,it is import ant for engineering flood control safety and safe operation.
作者
桑军伟
崔福占
SANG Junwei;CUI Fuzhan(Hebei Branch of Administration of South to North Water Diversion Middle Route Project,Shijiazhuang 050035,China;Hebei Design Institute of Water Conservancy and Hydropower,Tianjin 300250,China)
出处
《南水北调与水利科技》
CSCD
北大核心
2018年第S01期73-76,共4页
South-to-North Water Transfers and Water Science & Technology
关键词
MIKE21
磁河
倒虹吸
二维水流模型
水文分析
防洪评价
南水北调工程
MIKE21
Cihe River
inverted siphon
2-D numerical model of flow
hydrological analysis
flood control evaluation
the South-to-North Wat er Transfer project
