| 波浪作用下沉积物中氮、磷释放速率的试验研究 |
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| 引用本文： | 张严严,房文艳,许国辉,任宇鹏,许兴北.波浪作用下沉积物中氮、磷释放速率的试验研究[J].中国海洋大学学报(自然科学版),2020,50(4):102-110. |
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| 作者姓名： | 张严严 房文艳 许国辉 任宇鹏 许兴北 |
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| 作者单位： | 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;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;青岛水德仪器有限公司,山东青岛266100 |
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| 基金项目： | 国家自然科学基金项目(41576039)资助。 |
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| 摘 要： | 湖泊或海湾中的沉积物吸附氮(N)、磷(P)等元素所形成的沉积层成为水体富营养化的內源。在波浪作用下,尤其是强浪作用下,沉积物中的N、P会通过内源释放作用大量进入水体中。本文在自制的U型水槽中开展实验,采用不同水头差来模拟波浪的循环荷载作用,研究了沉积层中的N、P在静置固结状态(Ⅰ)、加波未液化状态(Ⅱ)、加波液化状态(Ⅲ)下的释放规律,并给出该试验条件下的沉积物释放速率的拟合方程。试验结果表明:沉积物中总氮(TN)和溶解性总氮(TDN)的释放速率会随着水动力作用的增强而增加;总磷(TP)、溶解性总磷(TDP)和活性磷酸盐(SRP)的释放速率也随着水动力作用增强而增加,但水体中悬浮物(SS)含量过高会限制其释放速率。
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| 关 键 词： | U型水槽 底床液化 内源释放 氮磷沉积物 |
Release Rate of Nitrogen and Phosphorus from Sediments Under Wave Action |
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| ZHANG Yan-Yan,FANG Wen-Yan,XU Guo-Hui,REN Yu-Peng,XU Xing-Bei.Release Rate of Nitrogen and Phosphorus from Sediments Under Wave Action[J].Periodical of Ocean University of China,2020,50(4):102-110. |
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| Authors: | ZHANG Yan-Yan FANG Wen-Yan XU Guo-Hui REN Yu-Peng XU Xing-Bei |
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| Institution: | (The Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China;College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Qingdao Water Tools,Qingdao 266100,China) |
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| Abstract: | Sediments in lakes or bays absorb nutrients such as nitrogen(N)and phosphorus(P),and the deposited layers become the endogenous source of eutrophication.Under the action of waves,especially strong waves,the N and P in the sediment will enter the water body in large quantities through the endogenous release.A self-made U-shaped sink that used different head differences to simulate the cyclic loading of waves,to study the release rate of N and P in the sedimentary layer under static consolidation stage(Stage I),non-liquefied(Stage II)and liquefaction state(Stage III),fitting equation for the rate of sediment release under the test conditions is given.The results show that the release rate of total nitrogen(TN)and dissolved total nitrogen(TDN)in sediments increases with the increase of hydrodynamic action;the total phosphorus(TP),dissolved total nitrogen(TDP)and active phosphate(SRP)also increase with hydrodynamic action,but excessive SS content in water limits its release rate. |
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| Keywords: | U-shaped sink liquefaction endogenous release nitrogen and phosphorus sediment |
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