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于2011年11月至2012年10月在黄河中游的三门峡、小浪底和花园口3个水文站进行每月1次的周期性采样观测以及在调水调沙期间进行连续采样观测,分析了小浪底水库水沙调控对溶解有机碳(DOC)输送的影响.结果表明,在小浪底水库和三门峡水库正常调度期间,三门峡站、小浪底站和花园口站的DOC含量分别为1.97~2.71 mg·L-1、1.87~2.76 mg·L-1和2.07~2.93 mg·L-1,并且均有明显的季节变化;在调水调沙期间,三门峡站、小浪底站和花园口站的DOC含量分别为2.14~3.32 mg·L-1、2.21~2.84 mg·L-1和2.11~2.84 mg·L-1,并且水库排沙阶段的DOC含量明显高于水库泄水阶段的DOC含量.无论是在水库正常调度期间还是在调水调沙期间,DOC含量与TSS含量及流量均没有表现出显著的相关性,而在水库正常调度期间DOC含量与水温呈现显著的正相关关系.11月~次年3月三门峡站和小浪底站的DOC输送量比较接近,4~7月三门峡的DOC输送量明显低于小浪底站,而8~10月三门峡站的DOC输送量又明显高于小浪底站,表明小浪底水库在8~10月大量拦蓄DOC,而在4~7月又将拦蓄下来的DOC排出水库.三门峡站、小浪底站和花园口站DOC年输送量分别为8.6×1010、9.0×1010和9.7×1010g,其中三门峡站9月DOC输送量最多,约占全年DOC输送量的22.0%,小浪底站6月DOC输送量最多,约占全年DOC输送量的17.6%,花园口站7月DOC输送量最多,约占全年DOC输送量的16.7%.在2012年调水调沙期间小浪底站和花园口站的DOC输送量占全年DOC输送量的比例分别为14.7%和13.8%,而三门峡站DOC输送量仅占全年DOC输送量的3.6%.
From November 2011 to October 2012, three monthly hydrological stations at Sanmenxia, Xiaolangdi and Huayuankou of the middle reaches of the Yellow River were observed cyclically, and continuous sampling observation was conducted during the period of water and sediment regulation. The Xiaolangdi Reservoir The results showed that during the normal operation of Xiaolangdi Reservoir and Sanmenxia Reservoir, the DOC contents of Sanmenxia, Xiaolangdi and Huayuankou stations were 1.97-2.71 mg · L -1, 1.87 ~ 2.76 mg · L-1 and 2.07 ~ 2.93 mg · L-1, respectively, with obvious seasonal changes. During the period of water and sediment regulation, the DOC contents of Sanmenxia Station, Xiaolangdi Station and Huayuankou Station were 2.14 ~ 3.32 mg · L-1, 2.21-2.84 mg · L-1 and 2.11-2.84 mg · L-1, respectively, and the DOC content in the sediment discharge stage was significantly higher than that in the reservoir discharge stage. During the period of water and sediment regulation, there is no significant correlation between DOC content and TSS content and flow rate, while there is a significant positive correlation between DOC content and water temperature during normal regulation of reservoir. From November to March, Sanmenxia Station And Xiaolangdi station DOC transport volume is relatively close, 4 ~ July three DOC transport volume was significantly lower than that of Xiaolangdi station, while the DOC transport volume of Sanmenxia Station from October to October was significantly higher than that of Xiaolangdi station, indicating that Xiaolangdi Reservoir blocks a large number of DOC from August to October and intercepts from April to July Of DOC discharged from the reservoir.The annual transportation capacity of DOC in Sanmenxia Station, Xiaolangdi Station and Huayuankou Station was 8.6 × 1010, 9.0 × 1010 and 9.7 × 1010g respectively, of which the DOC in Sanmenxia Station in September was the largest, accounting for about While Xiaolangdi Station recorded the highest DOC volume in June, accounting for 17.6% of the total DOC volume delivered in 2007, while Huayuankou Station recorded the highest DOC volume in July, accounting for 16.7% of the total DOC volume delivered in 2012. In 2012, During the year, the DOC transport volume of Xiaolangdi and Huayuankou stations accounted for 14.7% and 13.8% of the total DOC transport volume respectively, while that of Sanmenxia Station only accounted for 3.6% of the annual DOC transport volume.