垂向湍流扩散和光耦合对下沉藻增长的影响基于内陆混浊湖泊(太湖)分析

	垂向湍流扩散和光耦合对下沉藻增长的影响基于内陆混浊湖泊(太湖)分析
其他题名	Effect of vertical turbulent diffusion and light coupling on the growth of sinking algaeAnalysis based on inland turbid lakes (Lake Taihu)
	周妍 1; 赵巧华 2; 刘鹏 3
	2019
发表期刊	中国环境科学
ISSN	1000-6923
卷号	39 期号:2 页码:792-801
摘要	Based on the assumption of constant temperature and no nutrient salt limitation, a mathematical model coupling sinking algae growth and water environment of Lake Taihu was used to investigate the effect between the vertical turbulent diffusion and background diffused attenuation coefficient(Kbg) on the growth of sinking algae. The simulation results showed that the total biomass growth of the sinking algae could be sustained without vertical turbulent diffusion in the relatively clean water (Kbg was less than 1.1/m); in turbid water (Kbg was between 1.1~3.0/m), the growth required vertical turbulent diffusion to maintain, and the minimum vertical turbulence diffusion increased with the Kbg. The Peclet number between the minimum vertical turbulence diffusion(D), water depth(z) and the algae sinking speed(v) should between 0.38~13.89, otherwise the minimum vertical turbulence would have little effect on the growth than other factors (for example, algae sinking speed or light attenuation). When the Kbg was greater than 3.0/m, the light intensity of the water column was too low to maintain the total biomass growth of algae. This paper helped to clarify the phytoplankton population succession mechanism in aquatic ecosystems under climate change.
其他摘要	在假设温度恒定､弱化营养盐限制作用的条件下,利用太湖背景漫射衰减系数､日变化太阳辐射等数据,通过下沉藻生长与水环境相结合的耦合模型,模拟下沉藻增长过程中垂向湍流扩散和光之间的耦合.结果表明:在相对清洁水体中(背景漫射衰减系数小于1.1/m),下沉藻类无需垂向湍流扩散均可维持增长;混浊水体中(背景漫射衰减系数介于1.1~3.0/m)下沉藻类增长需垂向湍流扩散维持,且最低垂向湍流扩散值随背景漫射衰减系数增大而增大,二者间存在指数函数关系;最低垂向湍流扩散(D)､水深(z)与藻类下沉速度(v)间的佩克莱数应位于0.38~13.89,否则垂向湍流扩散对比其他因素(藻类沉降和光衰减),对水柱中下沉藻类的增长的作用甚小;当背景漫射衰减系数大于3.0/m,水柱平均光能可能难以满足藻类增长,藻类持续消亡.该研究有助于厘清气候变化背景下水生生态系统中的浮游植物种群演替机制.
关键词	下沉藻垂向湍流扩散背景漫射衰减系数数值模拟 sinking algae vertical turbulence diffusion background diffused attenuation coefficient numerical simulation
收录类别	CSCD
语种	中文
WOS关键词	Environmental Sciences & Ecology
WOS研究方向	Science & Technology
WOS类目	ENVIRONMENTAL SCIENCES
CSCD记录号	CSCD:6425867
引用统计	被引频次：2[CSCD] [CSCD记录]
文献类型	期刊论文
专题	任务一_子任务一循证社会科学证据集成任务一
作者单位	1.南京信息工程大学水文与水资源工程学院, 南京, 江苏 210044, 中国 2.南京信息工程大学水文与水资源工程学院, 南京, 江苏 210044, 中国 3.南京信息工程大学水文与水资源工程学院, 南京, 江苏 210044, 中国
推荐引用方式 GB/T 7714	周妍,赵巧华,刘鹏. 垂向湍流扩散和光耦合对下沉藻增长的影响基于内陆混浊湖泊(太湖)分析[J]. 中国环境科学,2019,39(2):792-801.
APA	周妍,赵巧华,&刘鹏.(2019).垂向湍流扩散和光耦合对下沉藻增长的影响基于内陆混浊湖泊(太湖)分析.中国环境科学,39(2),792-801.
MLA	周妍,et al."垂向湍流扩散和光耦合对下沉藻增长的影响基于内陆混浊湖泊(太湖)分析".中国环境科学 39.2(2019):792-801.