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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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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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海氷の垂直流動における浸透閾値：粒状海氷の場合

Kenneth M Golden1, Cynthia M Furse2, Adam Gully3

  • 1Department of Mathematics, University of Utah, 155 S 1400 E RM 233, Salt Lake City, UT, 84112-0090, USA. ken.golden@utah.edu.

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まとめ

海氷の浸透性は極域生態系にとって重要であり、柱状氷と粒状氷では異なる。粒状海氷は流体流動に対する閾値が高く、気候および生態系モデルに影響を与える。

キーワード:
海氷浸透性流体流動粒状海氷柱状海氷浸透閾値臨界指数極域生態系気候モデル

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科学分野:

  • 極域海洋科学
  • 海氷物理学
  • 生物地球化学

背景:

  • 海氷の流体浸透性は、融解池の力学、雪氷形成、藻類への栄養供給を含む、主要な物理的および生物学的プロセスに影響を与える。
  • 海氷は柱状と粒状の形態で存在し、それぞれ異なる微細構造と流体流動特性を持つ。
  • 南極に広く分布し、北極でも増加している粒状海氷は、浸透性に影響を与える独自の特性を持っている。

研究 の 目的:

  • 柱状海氷と粒状海氷の流体浸透性閾値を調査および比較する。
  • さまざまな海氷種の多孔率の関数としての浸透率の臨界指数を決定する。
  • 極域環境モデリングにおける海氷微細構造が流体流動に与える影響を評価する。

主な方法:

  • 南極東岸沖の海氷から収集された流体流動データの分析。
  • 多孔率の関数としての浸透率をモデル化するための浸透理論の適用。
  • 普遍的な臨界指数に関する理論的予測との実験データの比較。

主要な成果:

  • 柱状海氷は、バルク垂直流動に対して約5%のブライン体積分率の浸透性閾値を示す。
  • 粒状海氷は、バルク垂直流動に対して約10%のブライン体積分率というより高い閾値を示す。
  • 浸透理論は、それぞれの閾値を超える両方の氷種の浸透率の普遍的な臨界指数を正確に予測し、観察されたデータと一致する。

結論:

  • 海氷の微細構造は、流体浸透性の閾値を大きく変化させる。
  • 粒状海氷は、同様の多孔率で柱状海氷よりも流体流動に対する容量が大きい。
  • これらの発見は、極域環境の物理的および生態学的モデルにおいて、海氷の微細構造、特に粒状海氷を考慮する必要があることを示唆している。