相关实验视频
Updated: Feb 14, 2026

13:48
Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
13.6K
城市排水对接收流的盆地社区的影响
Neus Besolí-Mestres1, Mar Auró1, Sílvia Gómez-Arcusa2
1Catalan Institute for Water Research (ICRA- CERCA), Carrer Emili Grahit 101, Parc Científic I Tecnològic de la Universitat de Girona, 17003 Girona, Spain; University of Girona, Plaça de Sant Domènec 3, 17004 Girona, Spain.
Environmental pollution (Barking, Essex : 1987)
|February 12, 2026
概括
来自降雨事件的城市排水将复杂的污染物混合物引入溪流. 这些污染物影响河流生物膜和水生生物,增加城市水道的生态风险.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 淡水生态学 淡水生态
背景情况:
- 城市和工业降雨的下水流动动员化学污染物,形成复杂的混合物,可以损害水生生态系统.
- 这些污染物混合物可能具有协同作用或添加作用,超过单个污染物对水生生物和生态系统功能的影响.
研究的目的:
- 研究城市排水对河流生物膜和城市流中的宏观无脊椎动物群落的生态影响.
- 区分城市排水污染物的影响与降雨事件引起的水文干扰.
主要方法:
- 在一条城市河流 (西班牙吉罗纳) 中研究了五次排水事件,使用了控制 (上游) 与冲击 (下游) 设计.
- 对河流生物膜结构和功能 (叶绿素a,酸酶活性,细菌密度) 和宏无脊椎动物群体组成的评估影响.
- 监测溶解有机碳 (DOC),营养物质和特定污染物的度 (1,3-二四胺,,铜).
主要成果:
- 城市排水显著增加了营养,DOC和污染物度,导致生物膜中更高的叶绿素a,酸酶活性和细菌密度.
- 由于小规模洪水造成的水文干扰,生物膜脱离,使污染物特定影响的评估变得复杂.
- 宏观无脊椎动物社区组成的变化主要是由时间动态驱动的,而不是直接的污染物影响.
结论:
- 城市排水造成的污染影响往往被水文干扰等环境因素所掩盖.
- 生物膜社区在适度降雨事件中对污染物表现出更明显的反应,这使得污染物驱动的效应出现.
- 城市经常性排水对城市水流带来越来越多的生态风险,特别是气候变化和城市化导致极端天气事件.
相关概念视频
What are Populations and Communities?
38.0K
Overview
38.0K
Stream Function
2.1K
In two-dimensional incompressible fluid flow, the continuity equation is essential for ensuring mass conservation, meaning that any change in fluid entering or exiting a region is balanced by a corresponding change elsewhere. For incompressible flow, where density remains constant, this requirement simplifies to the condition that the divergence of the velocity field must be zero. Mathematically, this is expressed as,
2.1K
Receiver Operating Characteristic Plot
495
A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
495
Impact of Groups on Groups
262
Social psychologists analyze how groups influence one another, shaping social structures and interactions through both cooperation and competition. These dynamics manifest in various ways, ranging from economic partnerships to intergroup conflicts that shape societal structures and perceptions.Cooperation and Competition in Intergroup RelationsIntergroup relationships vary across contexts, sometimes fostering cooperation and mutual benefit while at other times leading to conflict and...
262
Steady Flow of a Fluid Stream
773
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
773
Community Based Intervention
489
Community-based interventions in mental health represent a paradigm shift from institution-centered care to treatments embedded within the fabric of local communities. By prioritizing inclusion and leveraging existing societal structures, this approach fosters a supportive environment conducive to addressing mental health challenges while promoting individual dignity and agency.
Foundations of Community Mental Health Programs
Central to the success of community-based interventions is the...
Foundations of Community Mental Health Programs
Central to the success of community-based interventions is the...
489

