在具有多孔结构的二维开放通道中进行流量分区.
Fikri M Radiyan1, Xiaofeng Liu2,3
1Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA, 16802, USA.
Scientific reports
|August 2, 2025
概括
一个新的代数模型预测了河流如何在多孔结构周围分裂,这对于洪水控制和息地至关重要. 该模型通过实验和模拟验证,强调道开放和拖动是关键因素.
科学领域:
- 水文学的水文学
- 流体力学 流体力学 流体力学
- 环境工程 环境工程
背景情况:
- 河流中的多孔结构显著影响流动动力学.
- 了解流量分区对于诸如洪水控制,沉积物运输和息地适宜性等应用至关重要.
研究的目的:
- 开发一个简单的代数模型来预测通过和周围多孔河流结构的流量分区.
- 使用实验和数值数据验证模型的性能.
- 量化关键无维参数对流量分区的影响.
主要方法:
- 开发了一种基于保存定律的第一原理代数模型.
- 使用了三个无维参数:弗罗德数 (Fr),通道开口分数 (β) 和阻力系数.
- 对流体实验和SRH-2D数值模拟进行了模型验证.
- 采用机器学习来分析参数的重要性.
主要成果:
- 代数模型准确地预测了流量分割分数 (α).
- 道开口分数 (β) 和阻力系数被确定为最有影响力的参数.
- 弗罗德数 (Fr) 对流量分区的影响较小.
- 在极端的参数值下,模型性能下降.
结论:
- 开发的代数模型提供了一个简单而有效的工具,用于对流分区进行初步工程评估.
- 这些发现提供了对控制多孔河流环境中流动行为的主要因素的见解.
- 可能需要进一步的研究来完善边缘场景的预测.
相关概念视频
01:17Steady, Laminar Flow Between Parallel Plates
333
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.
333
01:27Uniform Depth Channel Flow
159
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...
159
01:27Energy Considerations in Open Channel Flow
172
Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...
172
01:24Rapidly Varying Flow
139
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
139
01:23Plane Potential Flows
453
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...
Uniform...
453
01:18Uniform Depth Channel Flow: Problem Solving
126
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...
126