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関連する概念動画

Rapidly Varying Flow01:24

Rapidly Varying Flow

150
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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Gradually Varying Flow01:29

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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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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...
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Underflow Gates01:30

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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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Design Example: Design of an Irrigation Channel01:27

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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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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...
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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
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川の流れが変わる場所

Sam Brooke1, Austin J Chadwick2, Jose Silvestre3

  • 1Department of Geography, University of California Santa Barbara, Santa Barbara, CA, USA.

Science (New York, N.Y.)
|May 26, 2022
PubMed
まとめ
この要約は機械生成です。

洪水 を 引き起こし て いる 川 の 流出 は,ほとんど 理解 さ れ て い ませ ん. この研究は50年にわたる113の地球規模の大災害を分析し,その位置に関する重要な制御を特定し,洪水リスクの予測を改善しました.

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科学分野:

  • 流域地形学
  • 水学
  • リモートセンシングアプリケーション

背景:

  • 川の流れが急激に変化して 洪水が起こります
  • 排泄制御の理解は危険性評価に不可欠ですが,稀なデータによって制限されています.

研究 の 目的:

  • 世界的に川の流出場所の主要な制御を特定し,特徴づけること.
  • 洪水のリスクに影響を与える要因の理解を深める

主な方法:

  • 全世界の衛星画像を 50年近く分析したものです
  • 113件の川流出事故の記録と空間分析
  • 地形学的な特徴と水文学的条件との相関関係.

主要な成果:

  • 流出場所の3つの異なるコントロールが特定されました. 扇風機の谷の閉じ込めの変化と,デルタのバックウォーターゾーン内のフローダイナミクス (減速 / 加速).
  • デルタ流出の大部分は (38%) 乾燥地帯や熱帯地帯の急さで堆積物が多い川と関連している.
  • 洪水による上流浸食は,特定の河川のバックウォーター効果を超えて広がり,これらのケースでは流出の場所を決定します.

結論:

  • アヴルションの位置は,地形学的な設定と洪水ダイナミクスの組み合わせによって管理されます.
  • 沈殿物が豊富な急な川は,典型的な後退の影響を超えて独特の脱出行動を示します.
  • 発見は,土地利用と気候の変化に伴い,河川流出の危険性がどのように進化するかについての重要な洞察を提供します.