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相关概念视频

Weir01:24

Weir

38
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...
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Water and Mineral Acquisition02:34

Water and Mineral Acquisition

32.9K
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.
32.9K
States of Water01:23

States of Water

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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...
50.7K
Rapidly Varying Flow01:24

Rapidly Varying Flow

59
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
59
Responses to Drought and Flooding02:41

Responses to Drought and Flooding

10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
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Design Example: Design of an Irrigation Channel01:27

Design Example: Design of an Irrigation Channel

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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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Watershed Planning within a Quantitative Scenario Analysis Framework
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美国西部水权统一数据库 (HarDWR) v.1

Matthew D Lisk1, Danielle S Grogan2, Shan Zuidema2

  • 1Pennsylvania State University, Earth and Environmental Systems Institute, University Park, PA, USA. mdl5548@psu.edu.

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概括

来自美国西部11个州的水权数据被编译和标准化. 这创造了一个统一的数字资源,以了解干旱地区的水分配和法律纠纷.

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科学领域:

  • 环境法 环境法 环境法
  • 自然资源管理自然资源管理
  • 水法 水法 水法

背景情况:

  • 美国西部的水权由州政府机构合法记录和管理.
  • 在干旱和半干旱地区,获得水资源至关重要.
  • 现有的水权数据通常是分散的,缺乏数字可访问性.

研究的目的:

  • 创建一个统一的,数字数据集的水权从11个美国西部州.
  • 促进对水分配的研究和法律理解.
  • 解决各州数据格式和定义中的不一致问题.

主要方法:

  • 收集了来自美国西部11个州机构的水权数据.
  • 对水权和用水的标准化术语和定义.
  • 格式化数据以保持一致性,并将其与行政边界进行地理引用.

主要成果:

  • 一个全面的,数字水权数据集为11个美国西部州.
  • 统一的数据,使得跨州的比较.
  • 一个统一的形状文件,将水权与行政边界联系起来.

结论:

  • 开发的数据集为水资源管理和法律研究提供了宝贵的资源.
  • 标准化数据提高了利益相关者的可访问性和可用性.
  • 这个倡议提高了美国西部对水权的理解.