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相关概念视频

Quality of Water01:19

Quality of Water

629
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...
629
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

347
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...
347
Testing Water Quality01:14

Testing Water Quality

429
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
429

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相关实验视频

Updated: Mar 10, 2026

Watershed Planning within a Quantitative Scenario Analysis Framework
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Published on: July 24, 2016

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复杂的河流-河口连续的水质响应和管理导向的空间值.

Jiang Wu1, Tang Liu2, Dian-Bao Li3

  • 1Eco-environment and Resource Efficiency Research Laboratory, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China.

Water research
|March 9, 2026
PubMed
概括

网络配置显著影响珍珠河三角洲的水质,800米的缓冲区通过分离河流和河口区域来优化管理. 这项研究揭示了有针对性的水质控制的关键驱动因素和空间变化.

关键词:
环境影响值是指环境影响值.网络几何学 网络几何学河流-河口连续体.有针对性的管理管理.水质的变化水质的变化

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Last Updated: Mar 10, 2026

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科学领域:

  • 环境科学 环境科学
  • 水资源管理 水资源管理
  • 生态生态学 生态生态学

背景情况:

  • 珍珠河三角洲 (PRD) 是一个复杂的,城市化的河口系统,具有复杂的网络,对水质管理构成挑战.
  • 强烈的人类调节和潮和盐度分层等自然因素使理解网络结构和水质之间的关系变得复杂.
  • 目前的统一管理方法不足,因为对时空水质变化及其驱动因素的知识有限.

研究的目的:

  • 分析PRD在2019-2023年间的时间空间水质变化.
  • 确定网络配置和环境驱动因素对水质的影响.
  • 建立最佳的空间尺度,以有效地,有针对性的水质管理.

主要方法:

  • 从45个站点 (2019-2023) 收集每日水质数据.
  • 计算的网络指标包括树突连接指数 (DCI) 和发展系数 (Kω).
  • 采用LightGBM和Mantle分析,将水质变化归因于网络结构,水化学,水文学和社会经济驱动因素.

主要成果:

  • 网络几何学显示出明显的空间差异化,DCI呈现出南北梯度.
  • 为水质驱动因素确定了400-800m的最佳解释距离.
  • 水化学,水文学和社会经济因素是主要的驱动因素,像DCI和水面比 (Wp) 这样的网络指标显著影响电导率和度.
  • 一个800米的缓冲区有效地将河流和河口区分开,用于管理目的.

结论:

  • 网络配置在通过流量连接和材料运输来管理水质方面发挥着至关重要的作用.
  • 人类活动和水力动力学连接是水质变化的主要驱动因素,特别是在中间空间尺度 (≥600m) 上.
  • 建议采用800米的缓冲区方法,用于PRD城市聚合区的区域水质管理.