为研究洞庭湖入江水道断面的调整规律,选择城陵矶(七里山)水文断面,根据1962—2010年的实测水沙数据,运用小波分析方法对流量、含沙量序列进行多时间尺度分析,探明了洞庭湖入江水道水沙条件的周期变化规律;并选取城陵矶(七里山)枯水河槽断面面积为特征变量,结合流量小波系数对水沙条件序列进行时段划分;基于滞后响应原理,建立了适用于城陵矶河段断面面积对水沙条件的分时段变化调整模型。结果表明,建立的模型可以较好地模拟洞庭湖入江水道断面的调整规律,计算值与实测值拟合系数R2为0.77。
Abstract
In order to study the adjustment of discharge and sediment concentration of inlet section from Dongting Lake to Yangtze River, we take Chenglingji hydrological section as an example. According to measured data from 1962 to 2010, we carry out multi-time scale analysis of flow discharge and sediment concentration of Chenglingji station in association with wavelet analysis method to obtain the periodic changes of water-sediment load at the section. Then, we select the section area of low water level as characteristic variables, and use wavelet coefficient of discharge to divide discharge and sediment concentration sequences into different periods. On the basis of delayed response principle, we establish an adjustment model with different time intervals, which is suitable for the response of the water and sediment concentration in the area of the Chenglingji station of Qilishan. Results show that the model could well simulate the regularities of inlet section’s adjustment of Dongting Lake, and the fitted coefficient R2 between calculated and measured data is 0.77, which demonstrates that the model has adequate accuracy.
关键词
河床演变 /
小波分析 /
多时间尺度 /
滞后响应 /
断面面积
Key words
riverbed evolution /
wavelet analysis /
multi-time scale /
delayed response /
section area
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基金
国家自然科学基金项目(51339001,51209015);湖北省自然科学基金项目(2014CFB329)
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