上荆江沙市河段河床横断面形态的调整规律  

Adjustment regularity of cross-sectional morphology of Shashi segment of upper Jingjiang Reach

作　　者：余蕾[1,2] 王加虎[1] 邹志科[1] 卢金友[2] 李凌云[2] YU Lei WANG Jiahu ZOU Zhike LU Jinyou LI Lingyun(School of Hydrology and Water Resources, Hohai University, Nanjing 210098, China Key Laboratory of River Regulation and Flood Control of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China)

机构地区：[1]河海大学水文水资源学院,江苏南京210098 [2]水利部江湖治理与防洪重点实验室,湖北武汉430010

出　　处：《河海大学学报（自然科学版）》2016年第6期544-549,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(41271042;51339001);国家自然科学基金青年基金(51209015)

摘　　要：为研究冲积河流河床形态对水沙条件的响应调整规律,基于河床演变的滞后响应原理,对上荆江沙市河段河床横断面形态的调整过程进行研究。运用Morlet小波方法分析了沙市河段1956—2011年水沙序列的多时间尺度规律,采用滑动平均法拟合了流量、含沙量与断面面积的单一幂指数函数关系。结果表明,上荆江沙市河段河床横断面形态对水沙条件的响应存在滞后性,其河床形态的调整受到包括当前时段在内的前期水沙条件的共同影响。建立了水沙序列分时段的断面面积计算模型,模拟结果显示,河床横断面面积的变化情况与实际情况较接近,断面面积计算值与实测值的相关系数R^2=0.85,模拟精度较好,分时段计算模型可以较好地模拟上荆江沙市河段河床横断面形态的调整规律。In order to study the dynamic response of riverbed morphology of alluvial rivers to water and sediment conditions,the adjustment process of riverbed cross-sectional morphology at the Shashi segment of the upper Jingjiang Reach was investigated based on the delayed response principle of riverbed evolution. The multi-time scale rules of water and sediment series of the Shashi segment during the period from 1956 to 2011 were analyzed using the Morlet wavelet method,and a power-exponent relationship between the discharge,sediment load,and cross-sectional area was obtained with the moving average method. The results show that the adjustment of riverbed cross-sectional morphology of the Shashi segment is delayed with the change of water and sediment conditions and it is influenced by previous and present water and sediment conditions. The model for calculation of the cross-sectional area for water and sediment series in different time periods is established. The simulated results indicate that the simulated cross-sectional areas and actual values are in good agreement and their correlation coefficient R2 is 0. 85,indicating that the established model can simulate the adjustment regularity of riverbed cross-sectional morphology of the Shashi segment of upper Jingjiang Reach.

关 键 词：冲积河流 河床演变 小波分析 多时间尺度 滞后响应 断面面积 上荆江沙市河段 

分 类 号：TV147[水利工程—水力学及河流动力学]