相关实验视频
Updated: Jul 9, 2025

13:48
Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
13.1K
基于机器学习算法的喷灌系统的水分配均性的预测
Khadiga T Elhussiny1, Ahmed M Hassan1, Ahmed Abu Habssa2
1Department of Agricultural Engineering, Faculty of Agriculture, Cairo University, Giza, 12613, Egypt.
Scientific reports
|November 28, 2023
概括
机器学习模型准确地预测灌系统的水分配均性 (CU) 和分配均性 (DU). XGB-RF模型在预测统一系数方面显示出最高的准确性,这对于高效的水资源管理至关重要.
科学领域:
- 农业工程 农业工程
- 水资源管理 水资源管理
- 机器学习应用 机器学习应用
背景情况:
- 克里斯蒂安森的统一系数 (CU) 和分布统一性 (DU) 是灌系统设计和水损失评估的关键指标.
- 优化水分配对于有效的农业实践和资源保护至关重要.
研究的目的:
- 开发和评估用于预测水分配均性 (CU和DU) 的机器学习算法.
- 评估随机森林 (RF),极端梯度增强 (XGB) 和混合XGB-RF模型在预测统一系数方面的性能.
- 确定各种运营和环境因素对水分配均性的影响.
主要方法:
- 三种机器学习算法 (RF,XGB,XGB-RF) 用于预测CU和DU.
- 模型使用运行压力,喷雾器高度,排放,喷嘴直径,风速,湿度和温度的数据进行训练.
- 该研究考虑了三种冲击喷雾器类型 (KA-4,FOX,2520) 和两种系统布局 (方形,三角形) 在四个输入场景中.
主要成果:
- 在第一个场景中,XGB-RF模型实现了CU (0.929) 和DU (0.826) 的最高R2值.
- 最大CU值达到了86.7% (方形布局) 和87.3% (三角形布局).
- 喷水器的高度对统一性建模的影响最小.
结论:
- 机器学习模型,特别是XGB-RF,为灌系统中的水分配均性提供了准确的预测.
- 开发的模型可以帮助优化灌系统设计和水资源管理策略.
- 了解不同参数的影响对于提高灌效率至关重要.
相关概念视频
Conservation of Mass in Moving, Nondeforming Control Volume
1.1K
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...
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...
1.1K
Uniform Depth Channel Flow
76
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...
76
Design Example: Design of an Irrigation Channel
106
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...
106
Gradually Varying Flow
52
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...
52
Typical Model Studies
361
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.
361
Uniform Depth Channel Flow: Problem Solving
66
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...
66

