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根据 1956～ 1995年洞庭湖和长江中游水文泥沙等原型观测资料 ,运用数理统计方法与单值化技术 ,对城陵矶站水沙量及水位流量关系变化进行了分析研究。分析结果表明 ,城陵矶站水沙量 1956～ 1986年呈减小趋势 ,1987～ 1995年不再呈减小趋势 ;其断面年际变化呈淤积状态 ,从 1988年起出现冲刷趋势 ;其水位流量关系历年变化 ,同水位下泄洪能力高、中、低水均呈减小趋势 ,同流量下水位低、中水均有不同程度的抬高 ,高水变化趋小。
Based on the prototype observation data of hydrological sediment such as Dongting Lake and the middle reaches of the Yangtze River from 1956 to 1995, the relationship between sediment flux and water flow in Chenglingji Station was analyzed by using mathematical statistics and single-valued techniques. The results show that the runoff and sediment concentration of Chenglingji Station decreased from 1956 to 1986 and no longer showed a decreasing trend from 1987 to 1995. The interannual variation of the section was silting up and the trend of erosion appeared from 1988 onwards. The relationship between discharge and flow changes over the years. Flood discharge capacity under the same water level is high. Both middle and low water levels show a decreasing trend. Under the same flow rate, the water level is low and the water level is elevated to some extent, while the change of high water level is small.