摘要
利用MIKE21软件建立了考虑橡胶坝塌坝过程及区间汇流的兰村至汾河二坝段河道二维水动力模型。首先根据物理模型试验成果和恒定流水面线模拟进行了参数率定,并通过实测洪水过程和橡胶坝塌坝过程的模拟对所建模型进行验证,水位和流量吻合良好,说明所构建模型能较好地反映橡胶坝的塌坝过程。而后根据工程实际及度汛原则,针对7座橡胶坝不完全塌坝的4种组合方案进行了小频率洪水演进模拟,结果表明:洪水以波的形式传播,洪峰逐渐坦化,当发生20%频率洪水时,洪峰到达城区1号坝需要3 h,此时洪峰流量1 381 m3/s;行洪过程中,蓄水渠的流量分配与1号橡胶坝塌坝高度呈正相关关系;1号坝与5号坝处为浑水渠和蓄水渠之间中隔堤的始端与末端,会发生局部绕流现象,当洪水流量较小时,该现象愈加明显;方案B能够兼顾行洪和蓄水要求,为最优方案,相应各橡胶坝塌坝高度为:1.1、1.1、1.1、1.1、1.8、1.8、2 m。研究成果对较低频率洪水橡胶坝调度规则的制定有参考价值。
MIKE21 software is used to establish a two-dimensional hydrodynamic model of Lancun to Fenhe second dam,which considers the collapse process of the rubber dam and the interval confluence.Firstly,the parameters are calibrated according to the physical model test results and the constant flow surface line simulation.Through the simulation of the measured flood process and the rubber dam collapse process,the established model is verified.The water level and flow are in good agreement,and the established model can better reflect the rubber dam collapse process.Then,according to the engineering practice and flood control principle,the low-frequency flood evolution simulation is carried out for four combination schemes of seven rubber dams with incomplete collapse.The results show that flood spreads in the form of waves,and the wave crest is gradually changed in the process of propagation.When 20% frequency flood occurs,it takes 3 hours for the peak to reach the No.1 rubber dam in urban areas,and the peak flow is 1 381 m3/s.The flow distribution of the storage channel is positively correlated with the collapse height of No.1 rubber dam.No.1 dam and No.5 dam are the beginning and end of the middle dike between muddy canal and water storage canal,and local flow around the dike will occur.When the flood discharge is small,the phenomenon is more obvious.Scheme B is the optimal scheme because it can give consideration to the requirements of flood discharge and water storage,the corresponding dam collapse heights are 1.1,1.1,1.1,1.1,1.8,1.8 and 2 m.The research results can be used as a reference for the formulation of scheduling rules for rubber dams with low frequency floods.
作者
张倩楠
周敏
郝瑞霞
胡孜军
田淳
ZHANG Qian-nan;ZHOU Min;HAO Rui-xia;HU Zi-jun;TIAN Chun(College of Water Conservancy Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Chongqing Kaiwu Engineering Consulting Co.,Ltd,Chongqing 401122,China)
出处
《中国农村水利水电》
北大核心
2022年第9期106-112,119,共8页
China Rural Water and Hydropower
基金
山西省科学技术协会高校科协项目(2020010)。
关键词
梯级橡胶坝
洪水演进
泄流特性
塌坝过程
cascade rubber dams
flood evolution
discharge characteristics
dam collapse process
