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関連する概念動画

Alternative Sets of Equilibrium Equations01:31

Alternative Sets of Equilibrium Equations

965
When analyzing the behavior of structures, engineers often rely on the concept of equilibrium. This refers to the state where all forces and moments acting on a system balance each other, resulting in no net movement or rotation. In many cases, equilibrium can be described by a set of standard equations. However, in some situations, alternative sets of equilibrium equations must be used to describe the system's behavior accurately.
One example of such a situation can be observed in a...
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Design Example: Setting a Curve Using Design Data01:09

Design Example: Setting a Curve Using Design Data

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Designing and plotting a curve using field data requires precise calculations and execution. A horizontal curve with a radius of 200 meters and an intersection angle of 20 degrees is established using the method of perpendicular offsets from the long chord. The long chord, which spans between the curve's endpoints, is calculated to be 69.46 meters in length. To maintain accuracy in plotting, intervals of 3 meters are selected along the chord.The engineer determines the offset distances for each...
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Weir01:24

Weir

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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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Weir: Problem Solving01:26

Weir: Problem Solving

475
Water flow in open channels is often measured using hydraulic structures such as weirs, which allow precise calculation of discharge. In a rectangular channel, flow rates are measured using three types of weirs: rectangular sharp-crested, triangular sharp-crested, and broad-crested. The weir head is set at a fixed height above the channel bottom, simplifying calculations and enabling the relationship between depth and flow rate to be analyzed.For the rectangular sharp-crested weir, the flow...
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Buffers02:56

Buffers

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A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

305
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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関連する実験動画

Updated: Jan 22, 2026

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
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Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure

Published on: April 25, 2025

997

飽和バッファーの代替堰設定下での性能：設計および管理への影響

Gabriel M Johnson1, Thomas M Isenhart1, Christopher Hay2,3

  • 1Department of Natural Resource Ecology and Management, Iowa State University, Ames, Iowa, USA.

Journal of environmental quality
|January 21, 2026
PubMed
まとめ
この要約は機械生成です。

飽和バッファーの季節的な管理は、タイル排水からの硝酸窒素（NO3-N）の効果的な除去を実現します。しかし、長期間の完全排水期間は、かなりのNO3-N損失につながる可能性があり、慎重な現場の検討が必要です。

キーワード:
飽和バッファー硝酸窒素除去タイル排水堰管理農業水管理

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科学分野:

  • 農業水管理; 環境科学; 土壌科学

背景:

  • 飽和バッファーは、サブサーフェス排水からの硝酸窒素（NO3-N）の流出を軽減するための重要なエッジ・オブ・フィールド（圃場端）の実践です。; 季節的な堰標高管理が飽和バッファーにおけるNO3-N除去効率に及ぼす影響は、十分に研究されていません。

研究 の 目的:

  • 制御ボックスの堰標高管理が飽和バッファーにおけるNO3-N除去に及ぼす影響を評価すること。; USDA NRCS保全実践基準604からの設計予測と比較して、現場での処理性能を評価すること。

主な方法:

  • 2022年から2024年まで、253 mの飽和バッファー（約6ヘクタール）の流量とNO3-N負荷量を監視しました。; 堰標高を「完全排水」、「生育期」、「休閑期」の設定に調整しました。; さまざまな管理期間中の処理効率と流量バイパスを分析しました。

主要な成果:

  • 29日間の「完全排水」期間中、流量の25％とNO3-N負荷量の28％がバッファーを迂回しました。; NO3-N除去効率は、2023年および2024年と比較して2022年の方が高かったです。; 実際の処理流量は予測を超えましたが、ピーク排水流量は低く、設計以上の処理能力利用率を示しました。

結論:

  • 季節的な堰管理により、飽和バッファーでかなりのNO3-N除去を達成できます。; 長期間の「完全排水」期間では、かなりのNO3-N損失を防ぐために慎重な管理が必要です。; 観測された性能と予測された性能との間の不一致は、飽和バッファーの設計方法論の改訂が必要であることを示唆しています。