小浪底水库水沙调控影响下的黄河DIC输送特征

DIC Transport Characteristics of the Yellow River under the Influence of Xiaolangdi Reservoir

于2011年11月~2012年10月在黄河花园口水文站进行每月1次的周期性采样观测,并在2012年小浪底水库调水调沙期间在花园口站和小浪底站进行连续采样观测,分析了在小浪底水库水沙调控影响下黄河DIC的输送规律。结果表明,在小浪底水库正常调度期间花园口站DIC含量在24.4~31.6mg/L之间,平均26.8mg/L;并且有明显的季节变化,6~8月DIC含量明显高于其他月份。在小浪底水库调水调沙期间,花园口站DIC含量为30.2~38.5mg/L,并且表现为水库排沙阶段的DIC含量明显高于水库泄水阶段的DIC含量。花园口站全年DIC输送量为79.98万t;其中6月DIC输送量最大,约占全年DIC输送量的16.2%,2月DIC输送量最小,仅占全年DIC输送量的2.4%。

Sampling observations were made each month from November 2011 to October 2012,moreover,during runoff and sediment control period of the Yellow River in 2012,sampling observations were conducted continuously at Huayuankou and Xiaolangdi Hydrological Stations,and DIC transport characteristics under the influence of runoff and sediment control of Xiaolangdi Reservoir were analyzed.Results show that DIC content is 24.41-31.59mg/L in a year,and annual average content of DIC is 26.83mg/L at Huayuankou station during the normal scheduling period of Xiaolangdi Reservoir.DIC content is obviously seasonal variation in Huayuankou Station,and DIC contents of June to August is higher than the other month.During the period of runoff and sediment control of Xiaolangdi Reservoir,DIC contents at Huayuankou Station is 30.2-38.5mg/L,and DIC contents during sand-desilting period at Xiaolangdi Reservoir is higher than that during water-releasing period at Xiaolangdi Reservoir.A yearly DIC flux is 799 800 tons in Huayuankou Station,and DIC fluxes of June was the highest,which was account for 16.2% of annual DIC flux,and DIC fluxes of February was the lowest,accounting for 2.4% of annual DIC flux.