范·格努赫顿参数范围的近似估计来自液压导电数据
Aaron Peche, Georg Houben1, Sven Altfelder1
1Federal Institute for Geosciences and Natural Resources, Stilleweg 2, 30655, Hannover, Germany.
Ground water
|October 23, 2023
概括
这项研究引入了一种新的数学模型,用于估计Mualem-van Genuchten形状参数,用于在数据稀缺时可变和的介质流计算. 该模型只使用和液压导电率准确近似参数,帮助数值模型校准.
科学领域:
- 水文地质学 水文地质学
- 土壤物理 土壤物理
- 环境工程 环境工程
背景情况:
- 在变量和介质中精确的流量计算依赖于保留和相对导电功能的功能.
- 对于这些函数广泛使用的Mualem-van Genuchten模型,需要难以确定的形状参数 ( 和 ).
- 数据的稀缺性往往导致对这些参数使用文献值,这些值可能不反映实际现场条件.
研究的目的:
- 开发一种新的数学模型,用于近似 Mualem-van Genuchten 形状参数 ( 和 ).
- 估计这些参数的现实值范围,作为数值模型校准的参数空间.
- 提供可靠的方法来估计只有和液压导电数据可用的参数.
主要方法:
- 基于综合文献数据集的新数学模型的开发.
- 验证模型在从数据集中估计平均参数值时的准确性.
- 编制一个新的数据集,以证明模型的实际可用性.
主要成果:
- 这种新型模型使用有限的数据准确地近似了Mualem-van Genuchten的形状参数 (和).
- 该模型提供了现实的参数范围,适合数值模型校准.
- 在从大量文献数据集中估计平均值时表现出良好的准确性.
结论:
- 开发的模型为在数据稀缺的情况下估计基本液压参数提供了可靠的解决方案.
- 它提高了在变性和多孔介质中的流量计算的可靠性.
- 该模型集成到HYPAGS免费软件中,有助于其在水文地质研究中的实际应用.
更多相关视频
08:09Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity
Published on: August 19, 2018
9.2K
11:19Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
12.0K
相关概念视频
01:27Uniform Depth Channel Flow
78
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...
78
01:30Typical Model Studies
365
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.
365
01:27Design Example: Design of an Irrigation Channel
109
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...
109
01:18Uniform Depth Channel Flow: Problem Solving
70
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...
70
01:21Design Example: Creating a Hydraulic Model of a Dam Spillway
207
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.
207
01:28Accuracy, limits, and approximation
458
Accuracy, limits, and approximations are common in many fields, especially in engineering calculations. These concepts are imperative for ensuring that a given value is as close as possible to its true value.
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
458