Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
Mar Pollut Bull. 2013 Feb 15;67(1-2):45-54. doi: 10.1016/j.marpolbul.2012.12.002. Epub 2013 Jan 3.
The paper detailed a water quality modelling study of a hyper-tidal estuary, undertaken to assess the impact of various bacteria input loads on the receiving waters in a coastal basin in the UK, by using the model developed in previous study of the same authors enterococci, used as the indicators for bathing water quality under the new European Union (EU) Bathing Water Directive, were numerically modelled using a hydro-environmental model. In particular, the numerical model used in this study includes the effects of sediment on bacteria transport processes in surface water. Finally, the importance of sediment bacteria inputs on the bathing water quality was also investigated under different weather and tidal condition. During spring tide, the bacteria input from the bed sediments are dominant for both wet and dry weather conditions. During neap tides and during dry weather conditions the inputs of bacteria from the bed sediment were still dominant, but during wet weather conditions the inputs from river were dominant. Under different tidal flow conditions some parameters had a more significant role than others. During high flow conditions the sediment re-suspensions processes were dominant, therefore the bed bacteria concentrations played a dominant role on the overall bacteria concentration levels in the water column. In contrast, during low flow conditions sediment deposition prevails and bacteria are removed from the water column. The partition coefficient was found to be more important than the bed bacteria concentrations, during low flow conditions.
本文详细介绍了一项针对高潮汐河口水质建模的研究，该研究旨在评估英国沿海盆地中各种细菌输入负荷对受纳水体的影响。该研究采用了作者先前研究中开发的模型，以肠球菌作为新的欧盟（EU）浴场水质指令下浴场水质的指示物。使用水-环境模型对肠球菌进行了数值模拟。特别是，本研究中使用的数值模型包括了沉积物对地表水细菌输运过程的影响。最后，还研究了在不同天气和潮汐条件下，沉积物细菌输入对浴场水质的重要性。在大潮期间，无论是湿天还是干天条件下，床底沉积物中的细菌输入都占主导地位。在小潮期间和干天条件下，床底沉积物中的细菌输入仍然占主导地位，但在湿天条件下，河流输入的细菌占主导地位。在不同的潮流条件下，一些参数比其他参数更为重要。在高流条件下，沉积物再悬浮过程占主导地位，因此床底细菌浓度对水柱中总细菌浓度水平起主导作用。相反，在低流条件下，沉积物沉积占主导地位，细菌从水柱中被去除。研究发现，在低流条件下，分配系数比床底细菌浓度更为重要。
