相关实验视频
Updated: May 14, 2025

14:23
Design and Optimization Strategies of a High-Performance Vented Box
Published on: June 9, 2023
1.0K
考虑压缩效应的异质切断墙和污染物三维运输的服务性能研究
Pengyuan Zhang1, Junrui Chai1, Jing Cao1
1State Key Laboratory of Water Engineering Ecology and Environment in Arid Area, Xi'an University of Technology, Xi'an 710048, China.
Journal of contaminant hydrology
|April 11, 2025
概括
垂直切断墙有效地修复受污染的地点. 这项研究模拟了污染物运输,揭示了浅壁部分可以成为迁移通道,而设计因素在更深处变得至关重要.
科学领域:
- 地质技术工程 地质技术工程
- 环境工程 环境工程
- 水文地质学 水文地质学
背景情况:
- 垂直切断墙对于现场修复非点源污染至关重要.
- 了解通过和围绕隔离墙的污染物运输对于有效的场地管理至关重要.
- 现有的模型往往简化了异质切断墙系统中的复杂相互作用.
研究的目的:
- 提出一种方法来计算不同质的切断壁参数,考虑形和侧向挤出效应.
- 开发一个3D模型,用于不稳定的污染物运输在不和区域,涉及切断墙.
- 调查污染源特征和墙壁特性对隔离墙性能和故障时间的影响.
主要方法:
- 使用水平弹模型计算异质切断壁的参数.
- 开发了一个模拟合的对流-扩散-吸附-降解过程的3D数值模型.
- 分析了污染源位置 (μ1) 和分布范围 (σ) 对故障时间 (tb) 和深度 (hb) 的影响.
- 评估了墙壁摩擦角度 (φcw) 和剪切强度降低因子 (Rr) 对故障时间的影响.
主要成果:
- 确定了切断壁的浅部分可以形成占主导地位的污染物迁移通道.
- 证明污染源度 (μ1 和 σ) 的增加导致更长的分解时间 (tb) 和深度 (hb).
- 表明墙壁摩擦角度 (φcw) 和剪切强度降低因子 (Rr) 仅在故障深度 (hb) 很大时,才会显著影响故障时间 (tb).
结论:
- 该研究提供了一种计算异质切断壁参数的方法,以及一个3D污染物运输模型.
- 介绍了关于迁移通道的形成和影响切断壁故障时间的因素的见解.
- 提出了用于浅层增强切断壁的设计方法,有助于性能评估和结构优化.
相关概念视频
Typical Model Studies
161
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.
161
Steady, Laminar Flow Between Parallel Plates
85
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
85
Conservation of Mass in Fixed, Nondeforming Control Volume
787
The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
In the case of a sewer pipe, which can be modeled...
787
Steady, Laminar Flow in Circular Tubes
93
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
93
Couette Flow
127
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
127
Uniform Depth Channel Flow
48
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...
48

