张皓清¹, 贾永刚^1,2,3, 荆少东⁴, 王凯歌⁵, 卢芳^1,2,3, 潘玉英⁶, 刘锦昆⁴
1.中国海洋大学山东省海洋环境地质工程重点实验室, 山东 青岛 266100;2.青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室, 山东 青岛 266237;3.中国海洋大学海洋环境与生态教育部重点实验室, 山东 青岛 266100;4.中石化石油工程设计有限公司, 山东 东营 257026;5.青岛海关技术中心, 山东 青岛 266100;6.浙江海洋大学水产学院, 浙江 舟山 316022

摘要:
黄河水下三角洲位于半封闭的渤海内部，海底沉积物中重金属Cu污染严重，且该区域多发风暴潮，引起沉积物再悬浮甚至液化，导致沉积物中重金属Cu重新释放进入海水中。本研究以黄河口粉质土作为底床，采用室内波浪水槽试验模拟重金属Cu在不同水动力条件下，通过静态扩散、底床未液化状态下再悬浮以及底床液化状态下再悬浮3种方式进入上覆水体的释放过程。结果表明：上覆水体中重金属Cu的浓度分布与悬浮泥沙浓度分布密切相关，呈现出一致的变化规律；沉积物液化会明显促进重金属Cu向上覆水体中释放，底床液化再悬浮阶段上覆水体中溶解态Cu的浓度为静态扩散阶段的18倍，为底床非液化再悬浮阶段的11倍；此外，底床液化会导致沉积物中重金属Cu向深处扩散，扩散深度约为沉积物液化深度的一半。
关键词:波浪沉积物再悬浮沉积物液化重金属Cu释放
DOI：10.11759/hykx20190513001
分类号:X52
基金项目:国家自然科学基金青年基金项目（41807247）资助；国家自然科学基金委员会-山东省人民政府海洋科学研究中心联合资助项目（U1606401）资助

Study on the release of Cu in sediments due to wave-induced liquefaction
ZHANG Hao-qing¹, JIA Yong-gang^1,2,3, JING Shao-dong⁴, WANG Kai-ge⁵, LU Fang^1,2,3, PAN Yu-ying⁶, LIU Jin-kun⁴
1.Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100;2.Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237;3.Key Laboratory of Marine Environment&Ecology, Ministry of Education, Qingdao 266100;4.Sinopec Petroleum Engineering Corporation, Dongying 257026;5.Qingdao Customs Technology Center, Qingdao 266100, China;6.College of Fisheries, Zhejiang Ocean University, Zhoushan 316022
Abstract:
The underwater delta of the Yellow River is located in the semi-enclosed Bohai Sea. The sediment in this area is seriously polluted with heavy metal Cu. Wave-induced resuspension, and even the liquefaction of sediments, may lead to the re-release of heavy metal Cu in these sediments. In the present study, an indoor wave tank experiment, which used silty soil collected from the Yellow River Delta as the sediment, was used to simulate the release of heavy metal Cu through static diffusion, non-liquefied resuspension, and liquefied resuspension under different hydrodynamic conditions. Results showed that the concentration distribution of heavy metal Cu in the overlying water body was closely related to the concentration distribution of suspended sediment, and showed a consistent variation. Sediment liquefaction promoted the release of heavy metal Cu into the overlying water. The concentration of Cu in the overlying water in the liquefied resuspension stage was 18 times that in the static diffusion stage, and 11 times that in the non-liquefied resuspension stage. The liquefaction of the sediment caused the downward diffusion of the bottom layer of Cu into the sediment. The downward diffusion depth of Cu was approximately half the depth of the liquefied sediment.
Key words:wavesediment resuspensionsediment liquefactionheavy metal Curelease





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