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相关概念视频

Quality of Water01:19

Quality of Water

504
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
504
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

285
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
285

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相关实验视频

Updated: Jan 15, 2026

Watershed Planning within a Quantitative Scenario Analysis Framework
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Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

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从源到流:在长乐河流域中,CEC源的识别和量化.

Meixian Cao1, Dan Qin2, Xin Liao1

  • 1State Key Laboratory of Advanced Environmental Technology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Journal of hazardous materials
|October 7, 2025
PubMed
概括

新兴关注的污染物 (CEC) 在长乐河中广泛存在,主要来自未经处理的污水和猪废水. 了解这些来源对于管理淡水系统中的生态和健康风险至关重要.

关键词:
人类起源来源 人类起源来源这些指标是指标.城市周边流域的流域.积极矩阵因子化 (PMF)来源分配的分配方式

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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
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相关实验视频

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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
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科学领域:

  • 环境化学环境化学
  • 评估水质水质的评估.
  • 生态毒理学 生态毒理学

背景情况:

  • 新兴关注的污染物 (CECs),如药品,个人护理产品 (PPCPs) 和内分泌干扰化学品 (EDCs),在淡水系统中构成生态风险.
  • 河流网络中CEC的空间分布和起源尚不清楚,这阻碍了有效的管理.

研究的目的:

  • 调查CES在长乐河流域的空间特征和来源贡献.
  • 开发和应用CEC资源分配的综合框架.

主要方法:

  • 空间统计,多变量统计分析和受体模型的结合.
  • 分析不同季节 (湿季和干季) 河流水中 CEC 度.
  • 识别污染热点和主要污染源.

主要成果:

  • 在主运河和支流中观察到广泛的CEC污染,干旱季节的度更高.
  • 未经处理的污水 (37.6%) 和猪废水 (39.5%) 被确定为CEC的主要来源.
  • 污水处理厂 (WWTP) 的废水对CEC总体负载的贡献很小 (9.77%).

结论:

  • 长乐河的CEC污染是由点和非点来源的复杂混合驱动的,未经处理的家用和农业废水的贡献很大.
  • 有效的流域管理需要有针对性的源控制策略,以减轻与 CEC 相关的生态和人类健康风险.