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相关概念视频

Design Example: Design of an Irrigation Channel01:27

Design Example: Design of an Irrigation Channel

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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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Typical Model Studies01:30

Typical Model Studies

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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.
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Conservation of Mass in Moving, Nondeforming Control Volume01:14

Conservation of Mass in Moving, Nondeforming Control Volume

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Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
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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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Modeling and Similitude01:12

Modeling and Similitude

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Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
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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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相关实验视频

Updated: Jun 7, 2025

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm
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高效和公平的灌管理:一个模糊的多目标优化模型,集成水流动过程.

Hong Chang1, Gang Li1, Chenglong Zhang1

  • 1Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China; State Key Laboratory of Efficient Utilization of Agricultural Water Resources, China Agricultural University, Beijing, 100083, China.

Journal of environmental management
|November 9, 2024
PubMed
概括

这项研究开发了一种多目标模型,用于优化灌用水分配,平衡经济效益,水平等和不确定性下的效率. 该模型为可持续的灌农业提供最佳解决方案.

关键词:
决策方式 决策方式交互式模糊编程 交互式模糊编程灌规划 灌规划多目标规划多目标规划物理过程 物理过程不确定性 不确定性

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Watershed Planning within a Quantitative Scenario Analysis Framework
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Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts
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Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts

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相关实验视频

Last Updated: Jun 7, 2025

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科学领域:

  • 农业用水管理农业用水管理
  • 优化建模的优化建模
  • 环境科学 环境科学

背景情况:

  • 灌决策面临经济效益,水资源公平和效率之间的冲突,特别是在不确定性下.
  • 可持续地管理水资源需要平衡灌的竞争目标.
  • 赫塔奥灌区是灌用水供应和需求冲突中的一个例子.

研究的目的:

  • 开发一个强大的多目标模型,以优化灌用水分配.
  • 在不确定性下平衡经济效益,水资源公平和灌效率.
  • 为了解决灌用水供应和需求的冲突.

主要方法:

  • 利用水平衡模拟来模拟日常的水流动 (灌,土壤,地下水,排水).
  • 采用间隔多目标编程和模糊边界间隔编程来管理在不确定性下的客观冲突.
  • 应用交互式算法,以将约束可行性与客观满意度对齐,以获得最佳解决方案.

主要成果:

  • 针对不同可行性级别 (0.5-1.0) 的子区域和作物,得出了最佳的水分配解决方案.
  • 决策满意度达到0.9的可行性水平,平衡可行性和客观满意度.
  • 在0.9可行性,经济效益为[3.62,13.60] × 10^9元,与1.0可行性相比,基尼系数降低.

结论:

  • 开发的模型有助于在多个相互冲突的目标和不确定性下,优化灌的决策.
  • 实现最佳的灌用水分配促进了经济,社会和资源层面的可持续灌农业.
  • 平衡可行性和客观满意度对于将模型结果与决策者期望保持一致至关重要.