一种基于管理和环境变量的新早期滴灌系统成本估计模型
Masoud Pourgholam-Amiji1, Khaled Ahmadaali2, Abdolmajid Liaghat1
1Department of Irrigation and Reclamation Engineering, Faculty of Agriculture, College of Agriculture and Natural Resources, University of Tehran, P. O. Box 4111, Karaj, 31587-77871, Iran.
Scientific reports
|February 3, 2025
概括
这项研究开发了机器学习模型,以准确估计早期滴灌系统成本. 最好的模型,支持矢量机 (SVM) 和人工神经网络 (ANN),利用环境和管理功能来准确预测成本.
科学领域:
- 农业工程 农业工程
- 环境科学 环境科学
- 数据科学数据科学数据科学
背景情况:
- 压力灌系统,特别是滴灌,对于水资源管理至关重要.
- 对这些系统进行准确的早期成本估计是复杂的,而且还没有得到充分的研究.
- 了解成本驱动因素对于项目规划和投资至关重要.
研究的目的:
- 开发和验证机器学习模型,用于滴灌系统的早期成本估计.
- 确定影响系统成本的关键环境和管理特征.
- 为了比较各种功能选择和机器学习算法的性能.
主要方法:
- 编制了515个滴灌项目数据库,其中包括39个环境和管理特征.
- 使用特征选择算法 (例如LCA,FOA,Wrapper) 来识别影响成本的重要因素.
- 机器学习模型,包括支持矢量机 (SVM) 和人工神经网络 (ANN),进行了训练和测试.
- 模型性能使用R平方 (R2) 和根平均平方误差 (RMSE) 等指标进行评估.
主要成果:
- 在LCA和FOA特征选择算法证明了优秀的估计性能 (R2 ≈ 0.94,RMSE ≈ 0.002).
- 对于易于获得的特征,这些算法实现了0.95的R2和0.0006.6的RMSE.
- 在总体成本估计 (R2 ≈ 0.89-0.92) 方面,SVM模型 (RBF Kernel) 证明最有效.
- 在易于获得的特征 (R2 ≈ 0.88-0.91) 中,ANN模型 (MLP) 的表现最好.
结论:
- 机器学习模型,特别是SVM和ANN,可以准确地预测早期滴灌成本.
- 环境和管理特征是系统成本的重要预测因素.
- 开发的模型为灌项目的准确成本估计提供了有价值的工具.
相关概念视频
01:27Design Example: Design of an Irrigation Channel
64
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...
64
01:24Single Pipe Systems
96
In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
96
01:25Design Example: Designing a Residential Plumbing System
330
The design of residential plumbing systems requires carefully evaluating water demand, flow rates, and pressure dynamics to ensure both efficiency and reliability. The nature of water flow within pipes is defined by its Reynolds number, which classifies flow as either laminar (smooth) or turbulent.
330
01:28Pipe Flowrate Measurement: Problem Solving
256
A spray tank system is engineered to uniformly distribute a pest-control liquid across plants by using a pressurized mechanism. The tank, pressurized to 150 kPa, holds the pesticide at a height of 0.80 meters. Liquid flows from the tank through a 1.9 meter pipe with a diameter of 0.015 meters, angled at 0.698 radians, ultimately reaching a 0.007 meter nozzle that sprays the pesticide. Accurate calculation of the system's flow rate is crucial to ensure uniform application, and this is...
256
01:57Adaptations that Reduce Water Loss
25.1K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.1K
01:21Design Example: Creating a Hydraulic Model of a Dam Spillway
120
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
120