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関連する概念動画

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

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

342
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...
342
Rapidly Varying Flow01:24

Rapidly Varying Flow

548
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...
548
Gradually Varying Flow01:29

Gradually Varying Flow

484
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...
484
Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

805
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
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Typical Model Studies01:30

Typical Model Studies

649
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
649
Design Example: Design of an Irrigation Channel01:27

Design Example: Design of an Irrigation Channel

923
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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米国カリブ海における流況期間評価手法（SDAM）開発のための基礎的要素

Katiana Garcia-Rosado1,2, Ken M Fritz3,4, Augustin C Engman5

  • 1Oak Ridge Institute of Science and Education Fellow at U.S. Environmental Protection Agency, Office of Research and Development, Guaynabo, Puerto Rico, USA.

Aquatic conservation : marine and freshwater ecosystems
|February 25, 2026
PubMed
まとめ
この要約は機械生成です。

米国カリブ海における流況期間評価手法（SDAM）の開発は、水資源管理にとって極めて重要である。本レビューでは、プエルトリコと米領バージン諸島のための、新しく正確なSDAMに必要な主要な指標とフレームワークを特定する。

キーワード:
カリブ海プエルトリコ米領バージン諸島一時的水理地理学的フレームワーク指標間欠的永続的流況

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Last Updated: Feb 26, 2026

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科学分野:

  • 環境科学
  • 水文学
  • 生態学

背景:

  • 流況期間評価手法（SDAM）は、小川を分類するために水資源管理者にとって不可欠であるが、プエルトリコと米領バージン諸島には検証済みのSDAMが存在しない。
  • カリブ海の小川の特徴と流況期間に関する既存の研究は限られており、効果的な水管理を妨げている。

研究 の 目的:

  • 既存の小川研究をレビューすることにより、米国カリブ海SDAMの基礎を築く。
  • 小流況期間の候補指標と、この地域に適した水理地理学的フレームワークを特定する。

主な方法:

  • 包括的な文献レビューにより、2081件のタイトル/抄録と750件の全文文書がスクリーニングされた。
  • 小川の特徴と流況期間を評価した10件の研究から候補指標を特定した。
  • 地域データと2282件の小川区間を持つ235件の文書を分析し、流況期間を分類した。

主要な成果:

  • 流況期間を評価した研究は10件のみで、研究のギャップが浮き彫りになった。
  • 候補指標には、流域面積、河畔の草本被覆、魚類、水生無脊椎動物の指標が含まれる。
  • 生態学的ライフゾーンフレームワークが最も適しており、異なる森林ゾーンが永続的および間欠的な小川の普及率と相関している。

結論:

  • 米国カリブ海のための検証済みSDAMが必要であり、本レビューは不可欠な基礎を提供する。
  • 生態学的ライフゾーンフレームワークと特定された候補指標は、SDAM開発への道を提供する。
  • 米国カリブ海における流況期間の理解のギャップを埋めるためには、さらなる研究が必要である。