不同环境条件下恢复农业湿地停留时间分布动态的数值模拟

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Water Science and Technology Pub Date : 2025-04-01 Epub Date: 2025-03-14 DOI:10.2166/wst.2025.043
David Green, William Crumpton
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引用次数: 0

摘要

本研究展示了三维环境流体动力学代码(EFDC)水动力和质量输运模型的开发、校准和使用,以模拟混合模式,并研究环境控制对爱荷华州中部1.3公顷农业湿地停留时间分布的影响。结合时变的流动边界条件和大气强迫,该模型根据观察到的状态变量进行校准,包括水温、盆地水力特征和在出口监测的染料浓度,在不同的流量和大气条件下进行了六次示踪研究,当时淹没的水生植被大部分不在盆地中。EFDC合理地再现了观测到的盆地内部水力、温度和质量输运动力学,平均绝对相对误差在0.02至16.3%之间。敏感性分析表明,风切变对该系统模拟的RTD施加了最大的控制,并由此扩展到观测到的RTD,主要影响短路的测量,并在较小程度上影响整个盆地的混合,特别是在没有大气热强迫的情况下。发现热强迫在较暖时期显著影响短路和混合,这种影响受到风的高度影响。暂态流动名义上影响了大部分RTD特性,除了平均和中位数停留时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical simulation of the residence time distribution dynamics of a restored agricultural wetland under varying environmental conditions.

This work demonstrates the development, calibration, and use of the three-dimensional Environmental Fluid Dynamics Code (EFDC) hydrodynamic and mass transport model to simulate mixing patterns and study the environmental controls on the residence time distributions of a 1.3 ha agricultural wetland in central Iowa. Incorporating time-varying flow boundary conditions and atmospheric forcing, the model was calibrated against observed state variables, including water temperatures, basin hydraulic characteristics, and dye concentrations monitored at the outlet for six tracer studies conducted under varying flow and atmospheric conditions when submersed aquatic vegetation was mostly absent from the basin. EFDC reasonably reproduced observed basin internal hydraulics, temperatures, and mass transport dynamics, with mean absolute relative errors ranging from 0.02 to 16.3%. Sensitivity analyses suggest that wind shear exerts the greatest control on the modeled, and by extension observed, RTD for this system, primarily affecting measures of short-circuiting and, to a lesser degree, basin-wide mixing, particularly in the absence of atmospheric thermal forcing. Thermal forcing was found to significantly influence short-circuiting and mixing during warmer periods, with this effect being highly influenced by wind. Transient flows nominally influenced most RTD characteristics, save for mean and median residence times.

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来源期刊
Water Science and Technology
Water Science and Technology 环境科学-工程:环境
CiteScore
4.90
自引率
3.70%
发文量
366
审稿时长
4.4 months
期刊介绍: Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.
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