摘要
为研究调水调沙对黄河下游溶解铀浓度及其入海通量的影响,于2014年调水调沙期间在黄河小浪底站及利津站进行了连续同步观测。结果发现,调水调沙期间,小浪底站溶解铀浓度的平均值在调水阶段为(4.28±0.33)μg/L,调沙阶段为(4.19±0.29)μg/L;利津站溶解铀浓度的平均值在调水阶段为(4.55±0.22)μg/L,调沙阶段为(4.87±0.40)μg/L。无论是调水阶段还是调沙阶段,利津站溶解铀浓度的平均值均比小浪底站高,且调沙阶段溶解铀增加量显著高于调水阶段。进一步分析讨论得出调水调沙期间氧化还原条件的变化以及悬浮颗粒物粒径的变化是影响黄河下游溶解铀化学行为的主要因素。2014年调水调沙的运行使得黄河下游利津站的溶解铀入海通量比河流正常输运状态下增加了8.3×102 kg;而2015年在只进行了调水的情况下,从小浪底站到利津站溶解铀通量减少了4.1×103kg,说明不同模式下的调水调沙对溶解态铀入海通量的影响是不同的。由于在黄河口咸淡水混合带存在着悬浮颗粒物向水体释放溶解铀的现象,根据调水调沙期间悬浮颗粒物的增加量及溶解铀的释放系数估算得到2010年、2012年、2013年、2014年调水调沙期间在河口混合带释放的溶解铀分别为1.57×10~4 kg、0.739×10~4 kg、0.690×10~4 kg和8.25×102 kg,分别占各自年份全年溶解铀入海通量的15%、7.7%、5.3%和1.3%。
In order to study the impact on concentration of dissolved uranium and sea flux in the lower reaches of the Yellow River during the water-sediment regulation scheme(WSRS),continuous synchronous observation and sampling,were conducted at Xiaolangdi Station and Lijin Station of the Yellow River in 2014.Results show that,in Xiaolangdi Station during the WSRS,the mean value of dissolved uranium concentrations were(4.28±0.33)μg/L and(4.19±0.29)μg/L in water regulation stage and sediment regulation stage,respectively.The mean value of dissolved uranium of Lijin Station were(4.55±0.22)μg/L(in sediment regulation stage)and(4.87±0.40)μg/L(in sediment regulation stage).The comparison shows that,the average dissolved uranium concentration of Lijin Station is higher than that of Xiaolangdi Station in both water regulation stage and sediment regulation stage,and the increased of dissolved uranium in sediment regulation stage is significantly higher than that in water regulation stage.Furthermore,the results indicate that the change of redox conditions and the particle size of the suspended matters are the main factors which have affected the chemical behavior of dissolved uranium in the lower reaches of the Yellow River.In 2014,the sea flux of dissolved uranium at Lijin Station was increased by 8.3×10 2 kg compared with that without WSRS.However,in 2015,under the condition of water regulation only,the dissolved uranium flux was decreased by 4.1×10 3 kg from Xiaolangdi Station to Lijin Station,indicating that different modes of WSRS had different effects on the sea flux of dissolved uranium.Due to the phenomenon that suspended particulate matter released dissolved uranium into water in the Yellow River estuary,so we estimated the sea flux of dissolved uranium released in the estuary according the increased content of suspended particulate matter and the desorption/dissolution coefficient during the WSRS,which were 1.57×10 4 kg,0.739×10 4 kg,0.690×10 4 kg and 8.25×10 2 kg in 2010,2012,2013,2014,respectively,accounting for about 15%,7.7%,5.3%and 1.3%of the annual sea flux of dissolved uranium.
作者
于臣青
江雪艳
孟春霞
隋娟娟
刘倩
Yu Chenqing;Jiang Xueyan;Meng Chunxia;Sui Juanjuan;Liu Qian(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Key Laboratory of Ocean Chemistry Theory and Engineering Technology,Ocean University of China,Ministry of Education,Qingdao 266100,China;North China Sea Environmental Monitoring Center,State Oceanic Administration,Qingdao 266033,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2018年第10期209-219,共11页
基金
国家自然科学基金(41376085
41530965)
关键词
黄河
调水调沙
溶解态铀
通量
Yellow River
water-sediment regulation scheme
dissolved uranium
flux
