Modeling sediment impact on the transport of fecal bacteria
Modeling sediment impact on the transport of fecal bacteria
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DOI：
10.1016/j.watres.2005.10.013
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发表时间：
2005-12-01
期刊：
影响因子：
12.8
通讯作者：
Lung, WS
中科院分区：
文献类型：
--
作者：
Bai, S;Lung, WS
长期以来，人们一直观察到粪便细菌的沉积物储存。然而，有限的建模工作已经进行了动态和明确地研究沉积物对粪便细菌运输的影响。本文提出了一种基于环境流体动力学规范（EFDC）模型的建模框架。自由和颗粒相关的粪便细菌可以使用开发的模型明确建模。在模型中加入了线性吸附关系，以获得泥沙浓度依赖的附着比。结合沉积物沉积通量和再悬浮通量，计算了粪便细菌在沉积物床水界面上的沉积通量和再悬浮通量。将该模型应用于假设情景，评估了理想环境和再悬浮条件下的泥沙影响。通过实例研究了人工淹水条件下粪便细菌的再悬浮计算。利用该模型，可以分别明确地模拟来自沉积物床和流域的粪便细菌的贡献。(c) 2005 Elsevier Ltd版权所有。
Sediment storage of fectal bacteria has been observed for a long time. However, limited modeling efforts have been conducted to dynamically and explicitly study the impact of sediment on the transport of fecal bacteria. In this paper, a modeling framework based ion the Environment Fluid Dynamics Code (EFDC) model has been proposed. Free and particle-associated fecal bacteria can be modeled explicitly using the developed model. A linear adsorption relationship is incorporated into the model to obtain a sediment concentration dependent attachment ratio. The deposition and resuspension fluxes of fecal bacteria across the sediment bed-water interface are calculated coupled with the sediment deposition and resuspension flux. The model was applied to hypothetical scenarios to evaluate the sediment impacts under ideal setting and resuspension conditions. A case study was provided to test the resuspension calculation of fecal bacteria under an artificial flooding condition. Using this model, the contributions of fecal bacteria from sediment bed and from the watershed can be modeled separately and explicitly. (c) 2005 Elsevier Ltd. All rights reserved.