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関連する概念動画

Underflow Gates01:30

Underflow Gates

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Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
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Gradually Varying Flow01:29

Gradually Varying Flow

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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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Plane Potential Flows01:23

Plane Potential Flows

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Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform...
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Energy Considerations in Open Channel Flow01:27

Energy Considerations in Open Channel Flow

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Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...
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Laminar Flow01:27

Laminar Flow

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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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Rapidly Varying Flow01:24

Rapidly Varying Flow

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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...
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地球規模の地下水抽出の環境流量制限

Inge E M de Graaf1,2,3, Tom Gleeson4, L P H Rens van Beek5

  • 1Chair of Environmental Hydrological Systems, Faculty of Environmental and Natural Resources, University of Freiburg, Freiburg, Germany. inge.de.graaf@hydrology.uni-freiburg.de.

Nature
|October 4, 2019
PubMed
まとめ

地下水を汲み上げると 川の流れが大きく減り 水生生態系が脅かされます 2050年までに多くの流域は 地下水位の低下により 重要な環境の流れを維持できなくなるかもしれません

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科学分野:

  • 環境科学
  • 水学
  • エコロジー

背景:

  • 地下水は灌と世界の食料安全保障に不可欠な淡水資源です
  • 地下水の非持続的な抽出は,特に灌地域では,水位の低下と貯蔵の損失につながります.
  • 地下水位が低下すると 川の流れが減り 水生生態系に悪影響を及ぼします

研究 の 目的:

  • 地下水位の低下を 抽出から流れの減少に 結びつけるため
  • 重要な環境の流れが持続不可能な範囲とタイミングを推定する.
  • 地下水の使用による将来の環境的影響を評価する.

主な方法:

  • 地下水位の変化と流れの変化を結びつける総合的な分析
  • 持続不可能な環境フロー状態の発生を予測するモデリング
  • 地下水の汲み上げ率と流れの影響の評価

主要な成果:

  • 地下水の抽出は2050年までに世界の流域の42~79%で 重要な環境フロー限界に達すると予測されています
  • これらの流量制限は,地下水の貯蔵量がかなり減る前に到達することが多い.
  • 地下水の汲み上げが流れに与える影響は遅いですが,水生生態系に影響を及ぼし,深刻なものになる可能性があります.

結論:

  • 地下水の枯渇は 川の流れを減らすことで 水生生態系に重大な脅威をもたらします
  • 地下水の採取による環境への影響を軽減するために,緊急の管理戦略が必要である.
  • 地下水の抽出が遅れるため 将来の水供給と生態系の健全性を確保するための 積極的な対策が必要になります