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首页> 外文期刊>Environmental Science & Technology >Modeling of Sediment Transport through Stormwater Gravel Filters over Their Lifespan
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Modeling of Sediment Transport through Stormwater Gravel Filters over Their Lifespan

机译：沉积物通过雨水砾石过滤器的寿命模型

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摘要

Gravel filter media are widely used for attenuation and treatment of runoff in a range of stormwater management systems, including infiltration trenches/basins, porous pavements, and soakaways. These systems essentially reduce the effective impervious area of a catchment and also provide stormwater detention and infiltration into the surrounding soils, thus helping to restore predevelopment hydrology. Although it is well-known that these systems eventually clog and their treatment performance diminishes with time, no model developed has so far been developed to predict this behavior. The aim of this study was to develop a mathematical model of the transport of sediment through stormwater gravel filters over their lifespan. A detailed laboratory study of sediment transport was undertaken for different stormwater inflow regimes until the system became clogged. These data were used to test two models, the k-C~* model (the first-order decay model) and the Yao model (a physically based model). Although these models were able to predict sediment behavior in clean filters (i.e., at the start of their life), both failed to accurately simulate observed behavior once the filter accumulated sediment The main variables that impact the sediment process in dirty filters were quantified, and modifications to the Yao model were proposed. The modified model, with three calibration parameters, was calibrated for concentrations of total suspended solids. This model could be used in practice to asses the maintenance requirements of a gravel filter. Although developed for stormwater management, the model could be applied to a number of other disciplines, such as water treatment and groundwater recharge.
机译：砾石滤料被广泛用于一系列雨水管理系统的径流衰减和处理，包括入渗沟/盆地，多孔路面和索道。这些系统实质上减少了集水区的有效防渗面积，还提供了雨水滞留和向周围土壤的渗透，从而有助于恢复开发前的水文学。尽管众所周知，这些系统最终会堵塞并且其治疗性能会随着时间的推移而降低，但到目前为止，尚未开发出可预测这种行为的模型。这项研究的目的是建立一个在整个生命周期内通过雨水砾石过滤器输送沉积物的数学模型。进行了详细的实验室研究，研究了不同雨水入渗方式的泥沙运移，直到系统被堵塞。这些数据用于测试两个模型，即k-C〜*模型（一阶衰减模型）和Yao模型（基于物理的模型）。尽管这些模型能够预测干净过滤器中的泥沙行为（即，在它们的生命初期），但是一旦过滤器积聚了沉积物，这两个模型都无法准确地模拟观察到的行为。提出了对Yao模型的修改。使用三个校准参数对修改后的模型进行校准，以计算总悬浮固体的浓度。该模型可在实践中用于评估砾石过滤器的维护要求。尽管为雨水管理而开发，但是该模型可以应用于许多其他学科，例如水处理和地下水补给。

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  • 来源
    《Environmental Science & Technology》 |2007年第23期|p.8099-8103|共5页
  • 作者

    NILMINI R. SIRIWARDENE; ANA DELETIC; TIM D. FLETCHER;

  • 作者单位

    Institute for Sustainable Water Resources, Department of Civil Engineering, Building 60, Monash University, VIC 3800, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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