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首页> 外文期刊>Journal of the American Water Resources Association >EVALUATING THE APPLICABILITY OF A TWO-DIMENSIONAL FLOW MODEL OF A HIGHLY HETEROGENEOUS DOMAIN TO FLOW AND ENVIRONMENTAL MANAGEMENT
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EVALUATING THE APPLICABILITY OF A TWO-DIMENSIONAL FLOW MODEL OF A HIGHLY HETEROGENEOUS DOMAIN TO FLOW AND ENVIRONMENTAL MANAGEMENT

机译：评估非均质域二维流动模型在流动和环境管理中的适用性

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摘要

Two-dimensional simulation of highly heterogeneous domains, especially those with disparate length scales, roughness conditions, and geometries, often leads to challenges such as long computation times and numerical instability. Simulation of challenging domains is often needed to guide flood management and environmental regulation agencies in operation and potential domain modifications. This work evaluates the ability of a two-dimensional unsteady hydrodynamic model to represent long-duration transient flows over a domain with highly heterogeneous roughness, geometric characteristics, and length scales through bed roughness representation. The domain includes 13km of Cache Creek and the 14.5km(2) Cache Creek Settling Basin, which traps both sediment and mercury. Calibration under different bed roughness methods, validation, and modeling results of bathymetric modification scenarios are presented. The modeling approach's performance supports its application as a tool for management of similar domains, such as settling basins, leveed floodplains, and reservoirs. Accurate representation of flow dynamics can also inform environmental management that involves transport of sediments, nutrients, and heavy metals. This study found that a two-dimensional unsteady flow model can accurately represent long-duration transient flow in a large settling basin with highly heterogeneous characteristics without parsing of the domain or flow events simulated.
机译：高度异构域的二维仿真，尤其是那些具有不同长度比例，粗糙度条件和几何形状的域，通常会带来诸如长计算时间和数值不稳定的挑战。通常需要对具有挑战性的域进行仿真，以指导洪水管理和环境法规机构运营和可能的域修改。这项工作评估了二维非定常水动力模型在通过床层粗糙度表示具有高度非均质粗糙度，几何特征和长度尺度的区域上表示长期瞬态流动的能力。该域包括13公里的Cache Creek和14.5km（2）的Cache Creek沉降盆地，该盆地既沉积物又捕获汞。介绍了在不同床粗糙度方法下进行的校准，验证以及测深修改方案的建模结果。建模方法的性能支持将其用作管理类似领域（如沉降盆地，斜坡洪泛区和水库）的工具。流动动力学的准确表示也可以为涉及沉积物，营养物和重金属运输的环境管理提供参考。这项研究发现，二维非定常流动模型可以准确地代表具有高度非均质特征的大型沉降池中的长期瞬态流动，而无需解析模拟的域或流动事件。

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