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Modeling Floodplain Filtration for the Improvement of River Water Quality

机译：洪泛区过滤建模以改善河流水质

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A mathematical model was developed to describe a treatment method of flood-plain filtration for the improvement of river water quality. The process consists of spraying poor quality river water onto the river floodplains and thus allowing soil filtration to treat water before it gets back again into the main river stream. This technique can be readily employed in Korea because it exploits the characteristics of the climate and rivers in the country, as described in an experimental study of Chung et al. (2004). The model was analyzed by numerical methods and validated by comparing the simulated values with experimental data. A scenario analysis of the model was also performed in order to have a better understanding of the floodplain filtration process. Our results show that the model was able to predict the reduction in organic matter and NO_3~- in river water through the floodplain filtration. Furthermore, it was found that only a few decimeters of top soil profile were enough to degrade most of the organic matter under wider operational conditions than those reported in the literature. Also, it was found that significant infiltration of atmospheric oxygen took place near the soil surface. The N_2O emission and the NO_3~- leaching increased with the increase in the influent NO_3~- concentration. However, the N_2O emission due to floodplain filtration was not expected to exceed 0.1 mL/m~2-day.
机译：建立了数学模型来描述洪泛区过滤处理方法，以改善河水水质。该过程包括将劣质的河水喷洒到河滩上，从而允许土壤过滤在水再次流回主要河流之前对其进行处理。如Chung等人的实验研究所述，该技术可充分利用韩国的气候和河流特征，因此在韩国很容易采用。 （2004）。通过数值方法分析该模型，并通过将模拟值与实验数据进行比较来验证该模型。为了更好地了解洪泛区过滤过程，还对该模型进行了情景分析。我们的结果表明，该模型能够通过漫滩平原过滤来预测河水中有机物和NO_3〜-的减少。此外，还发现，与文献报道相比，在更宽的操作条件下，仅几分米的表层土壤剖面足以降解大多数有机物。另外，还发现在土壤表面附近发生了明显的大气氧渗透。随着进水NO_3〜-浓度的增加，N_2O的排放和NO_3〜-的浸出量增加。然而，洪泛平原过滤导致的N_2O排放预计不会超过0.1 mL / m〜2天。

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