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相关概念视频

Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

40
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
40
Single Pipe Systems01:24

Single Pipe Systems

108
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...
108
Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

41
The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
41
Multiple Pipe Systems01:21

Multiple Pipe Systems

427
Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
427
Design Example: Designing a Residential Plumbing System01:25

Design Example: Designing a Residential Plumbing System

378
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.
378
Plane Potential Flows01:23

Plane Potential Flows

369
Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform...
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相关实验视频

Updated: Jun 5, 2025

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
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不确定性分析方法用于诊断城市排水系统的多点缺陷.

Chutian Zhou1, Pan Liu1, Xinran Luo1

  • 1State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China; Research Institute for Water Security (RIWS), Wuhan University, Wuhan 430072, China; Hubei Provincial Key Lab of Water System Science for Sponge City Construction, Wuhan University, Wuhan 430072, China.

Water research
|December 9, 2024
PubMed
概括

这项研究引入了一种混合方法来诊断城市排水系统的缺陷,提高准确性和速度. 它通过分析管道泄漏检测中的不确定性,有效地减少了误诊.

关键词:
混合方法是一种混合方法.多点缺陷诊断多点缺陷诊断后一个概率分布.不确定性分析不确定性分析城市排水系统城市排水系统

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相关实验视频

Last Updated: Jun 5, 2025

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
08:49

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科学领域:

  • 环境工程 环境工程
  • 计算流体动力学的流体动力学.
  • 地质技术工程 地质技术工程

背景情况:

  • 城市排水系统 (UDS) 是关键基础设施,但管道缺陷会导致漏,导致城市洪水和环境问题.
  • 目前的缺陷检测方法,比如反向优化,通常会产生单一的解决方案,忽视不确定性并冒错误诊断的风险.
  • 同时诊断多个缺陷是由于高维参数空间而带来的重大计算挑战.

研究的目的:

  • 开发一种新的混合方法,用于在UDS中准确和高效的多点缺陷诊断.
  • 将不确定性分析纳入缺陷定位,以减轻误诊.
  • 为了减少与多点缺陷识别相关的计算负担.

主要方法:

  • 这是一种混合方法,它结合了用于广泛模型空间探索的多种群遗传算法 (GA) 和用于后方概率分布 (PPD) 估计的自适应大都市 (AM) 算法.
  • GA用于识别可能的缺陷位置,其次是AM来改进缺陷参数的PPD.
  • 在合成UDS数据上使用精度 (ACC),马修斯相关系数 (MCC) 和平均绝对误差 (MAE) 的性能评估.

主要成果:

  • 拟议的混合方法在多点缺陷诊断方面表现优越,与DiffeRential Evolution适应大都市方法相比,实现了更高的ACC (0.91对0.78) 和MCC (0.87对0.69).
  • 诊断速度提高了32%,解决了传统方法的计算负担.
  • 估计的PPD通过了90%的置信区间验证,证实了不确定性分析的可靠性.

结论:

  • 混合GA-AM方法为诊断UDS多点缺陷提供了有效的解决方案,提供了强大的不确定性分析.
  • 这种方法显著降低了经常与传统单一解决方案方法相关的误诊风险.
  • 提高速度和准确性使这种方法适合在城市基础设施管理中的实际应用.