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Regulation of Water Output01:26

Regulation of Water Output

2.0K
The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
2.0K
Regulation of Water Intake01:25

Regulation of Water Intake

2.6K
Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
2.6K
States of Water01:23

States of Water

55.8K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
55.8K
Quality of Water01:19

Quality of Water

482
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...
482
Weir01:24

Weir

427
A weir is a hydraulic structure designed to partially obstruct an open channel, enabling precise control and measurement of water flow. By forcing water to flow over or through it, a weir allows for accurate determination of discharge rates, making it an essential tool in water resource management. These structures are extensively used in regulating river flows, irrigation systems, and flood control channels.Types of Weirs and Their FeaturesWeirs are categorized primarily into sharp-crested and...
427
Water and Mineral Acquisition02:34

Water and Mineral Acquisition

35.2K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
35.2K

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相关实验视频

Updated: Jan 8, 2026

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
12:50

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

11.8K

美国取水数据库

Md Yunus Naseri1, Landon T Marston2

  • 1Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, USA. mohammadyunusn@vt.edu.

Scientific data
|December 11, 2025
PubMed
概括

美国取水数据库 (USWWD) 提供了42个州的详细取水数据. 这一全面的数据集增强了对用水模式的理解,并支持关键水资源管理.

科学领域:

  • 环境科学 环境科学
  • 水文学的水文学
  • 水资源管理 水资源管理

背景情况:

  • 国家用水数据往往缺乏标准化和细节细节,阻碍了全面的分析.
  • 之前的数据集没有以深入研究所需的空间和时间分辨率捕获水的提取.
  • 了解社会用水对于有效的资源管理和政策制定至关重要.

研究的目的:

  • 将美国42个州的用户水量提取数据编译和标准化为一个单一的,可访问的数据库.
  • 以空前的空间和时间分辨率提供取水数据.
  • 解决国家用水数据中的重大缺口,并促进详细分析.

主要方法:

  • 整合了各种各样的州级数据来源,包括水使用者,取水地点,水量,来源类型和使用类别.
  • 美国42个州的标准化信息,包括188,857个独特的用水用户和数百万的提取记录.
  • 由国家机构报告的联合直接测量和估计技术.

主要成果:

  • 开发了美国取水数据库 (USWWD),拥有广泛的时间序列数据.
  • 捕获了353,694个转移和使用点和58,439,412个提取量.
  • 为取水数据实现了高空间和时间分辨率.

更多相关视频

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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Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
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Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds

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相关实验视频

Last Updated: Jan 8, 2026

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
12:50

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

11.8K
Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

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Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
06:37

Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds

Published on: November 13, 2017

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结论:

  • 美国水资源使用日提供了迄今为止最详细的全国用水数据.
  • 这种细粒度的数据集使得我们能够对取水模式,趋势和驱动因素有新的见解.
  • 促进先进的研究,并支持水资源管理,规划和政策制定.