| 摘要: |
| 水动力条件是影响水体富营养化状态和进程的主要自然因素.研究水动力条件对水体富营养化的影响对于水体富营养化模拟、预测和控制具有十分重要的意义.水动力条件能直接作用于水华藻类细胞,影响其生长繁殖与种间竞争,同时改变水体环境及营养盐的状况.其中,流速不仅对藻类的生长聚集与分布具有十分明显的影响,同时还能影响水体营养物质与优势藻的种类;流量则主要通过单位时间内水量的变化影响水体富营养化的发生与消亡;水体扰动直接作用于水体中藻类细胞与藻团,加强藻类的聚集,同时影响营养物质的混合与运移,从而使水体富营养化得以发生并持续.本文综述了流速、流量和水体扰动等水动力因子对水体富营养化的影响研究,并对其未来的研究方向进行展望,最后指出:不同水动力条件对营养盐存在形态、藻类生长及水体富营养化状态的影响机理和水动力条件对水体富营养化影响的滞后性规律与临界值研究有待进一步加强. |
| 关键词: 水动力条件 富营养化 流速 流量 水体扰动 藻类 |
| DOI：10.18307/2013.0401 |
| 分类号: |
| 基金项目:国家科技支撑计划课题项目(2011BAC12B02);国家水体污染控制与治理科技重大专项项目(2008ZX07209-009);国家自然科学基金优秀创新群体项目(51121003)联合资助 |
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| Effect of hydrodynamic conditions on water eutrophication: A review |
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LIANG Peiyu1,2, WANG Xuan1,2, MA Fangbing1,2
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1.Key Laboratory for Water and Sediment Sciences of Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, P.R.China;2.State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, P.R.China
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| Abstract: |
| Hydrodynamic conditions,including the flow velocity,discharge and water disturbances,play a key role in the occurrence, development,continuation and extinction of eutrophication.In order to prevent and control eutrophication,it is vital to study the influence of hydrodynamic conditions on eutrophication.Hydrodynamic conditions can not only affect the growth and interspecific competition of algae,but also change natural environment and nutrient loads of the water body.More details are as follows.(1) The flow velocity has a very significant effect on algae aggregation and distribution,as well as nutrients and the dominant algae.It is also found that there is an adaption period of the growth of algae biomass to the change of the flow velocity.(2) Discharge makes an effect on eutrophication mainly by altering the flow velocity and water quantity.(3) Water disturbance,which mainly originating from wind and tide et al,directly acts on algae cells and groups in strengthening the aggregation of algae,as well as influences the mixture and transportation of nutrients in vertical and horizontal directions.Reynolds Number and the type of water circulation are also regarded as hydrodynamic factors,which can make influence to eutrophication.At present,the study of hydrodynamic conditions' impacts on eutrophication is still in the stage of qualitative research.Some key issues,such as the influence on nutrients,the law of hysteretic nature and critical value of hydrodynamic conditions,still need further study. |
| Key words: Hydrodynamic conditions eutrophication velocity discharge water disturbance algae |
