摘要
近年来,荆江河段,尤其是上荆江发生了较大规模的无序采砂问题,给河道变形及河势稳定带来了不利影响。以长江荆江关洲汊道段无序采砂为例,利用河道原型观测资料,分析了关洲汊道段河道形态的变化。采用平面二维水动力学数学模型模拟汊道的分流量及分流比,研究采砂后汊道主支汊易位的临界流量。利用河道及水文测验的实测资料,分析研究采砂对上游河道及枝城水文站水位的影响。分析结果显示,大规模无序采砂对关洲汊道的形态及分流格局产生影响,给上游河道带来一定影响,在河道整治及航道工程维护后,该河段若无大规模采砂发生,汊道格局将维持相对稳定,主支汊易位的临界流量维持在15000~16000 m3/s。
A large scale disordered sand mining has occurred in the Jingjiang River,especially in the upper Jingjiang reach in recent years,which has an adverse influence on river planform and river regime stability.Taking the Guanzhou branch of Jingjiang in the Yangtze River as example,the variation of river planform in the Guanzhou branch is analyzed based on observation data of the river channel. The critical flow of primary and secondary branches replacement after sand mining is calculated by the planar two-dimensional hydrodynamic numerical model to simulate the flow diversion and diversion ratio of the branch channel. Based on the measured data of river channel and hydrological measurement,the influence of sand mining at the water level of upstream channel and the Zhicheng hydrological station are analyzed. Result show that the large-scale disordered sand mining caused an influence on the river planform and distributary pattern of the Guanzhou branch,and also on the upstream channel. After the river regulation and the maintenance of the channel project,the branch pattern will remain relatively stable if there is no large-scale sand mining in this reach,and the critical flow of primary and secondary branch replacement is maintained at 10 000 m3/s to 12 000 m3/s.
作者
彭玉明
黄烈敏
PENG Yu-ming;HUANG Lie-min(Jingjiang Bureau of Hydrology and Water Resources Survey,Changjiang Water Resources Commission,Jingzhou 434000,China)
出处
《泥沙研究》
CSCD
北大核心
2020年第4期27-32,共6页
Journal of Sediment Research
基金
国家重点研发计划项目(2017YFC0405305)。
关键词
无序采砂
关洲汊道
分流
影响
disorder sand mining
Guanzhou branch
flow diversion
influence
