长江中游螺山站水位流量关系分析

Analysis on water level-discharge relation of Luoshan hydrologic station in middle reaches of Yangtze River

螺山水文站是长江中游河段的重要控制测站,通过分析不同因素影响下螺山水文站水位流量关系及其变化规律,得出了螺山站水位流量关系多年基本稳定的原因。计算了螺山水文站在裁弯前后因河床淤积导致水位流量关系抬高的程度。为消除洪水涨落率、变动回水和断面冲淤的综合影响,提出了螺山站不同水位级下的水位流量关系,对于洪水期水文预报以及超额洪量分配与调度,具有重要的参考价值。

By analyzing the water level-discharge relation and variation rules at this station impacted by different factors,we draw a conclusion that the relation is basically stable over the past years.We calculate the uprising degree of water level-discharge induced by sediment deposition before and after the river bend cut-off at Luoshan hydrologic station.Aiming at eliminating comprehensive impacts of flood fluctuation ratio,fluctuating backwater and section erosion and deposition,we propose the water level-discharge relation at different water levels respectively.The results show that it has the important reference values for hydrological forecasting during the flood period and distribution and regulation of extra flood volume.