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首页> 外文期刊>International journal of ecohydrology and hydrobiology >Predicting dissolved reactive phosphorus in tile-drained catchments using a modified SWAT model
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Predicting dissolved reactive phosphorus in tile-drained catchments using a modified SWAT model

机译：使用改进的SWAT模型预测瓷砖排水集水区中的溶解反应性磷

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Phosphorus (P) is mainly leached by subsurface transport pathways in tile-drained landscapes. In this study, we modified the SWAT model (SWAT-P) by incorporating dissolved reactive phosphorus (DRP) losses from drainage water and the deep aquifer. SWAT-P was tested in a tile-drained lowland catchment using a multi-site calibration and validation approach. SWAT reached a good statistical performance regarding discharge for all sub-catchments and a daily time step. As discharge was dominated by subsurface flow, we optimized DRP concentrations for the drainage water (SWAT-P), the shallow aquifer (SWAT, SWAT-P), and the deep aquifer (SWAT-P) and left other P-related parameters at their default settings, since they did not influence the model output. DRP losses were simulated at a monthly time step using SWAT and SWAT-P. The predictive power was weaker compared to discharge for both SWAT and SWAT-P. Nevertheless, SWAT-P performed considerably better than SWAT. Additionally, calibrated DRP concentrations were unrealistically high for SWAT, whereas calibrated DRP concentrations reflected the prevailing conditions in the region using SWAT-P. The results indicated improved prediction accuracy for DRP losses into streams by using SWAT-P, as well as a roughly realistic estimation of DRP losses from tile drainage water. Further research is necessary to account for the temporal DRP concentration dynamics in drainage water. SWAT-P is ready to use after defining DRP concentrations in tile drainage water and the deep aquifer in the SWAT-P input files. In addition, the model output was extended in SWAT-P to visualize DRP losses from drainage water and from the deep aquifer. (C) 2019 European Regional Centre for Ecohydrology of the Polish Academy of Sciences. Published by Elsevier B.V. All rights reserved.
机译：磷（P）主要由瓷砖排水景观中的地下输送途径浸出。在该研究中，我们通过将溶解的活性磷（DRP）损耗从排水和深含水层掺入溶解的活性磷（DRP）损失来修饰SWAT模型（SWAT-P）。使用多站点校准和验证方法在瓦片排水的低地集水区中测试了SWAT-P。 SWAT达到了对所有子集型和每日时间步骤的出院的良好统计表现。由于放电由地下流动占主导地位，我们优化了排水水（SWAT-P），浅含水层（SWAT，SWAT-P）和深含水层（SWAT-P）的DRP浓度，并留下其他相关参数它们的默认设置，因为它们没有影响模型输出。在使用SWAT和SWAT-P的月度时间步骤中模拟DRP损耗。与SWAT和SWAT-P的放电相比，预测力较弱。然而，SWAT-P比SWAT更好地执行。另外，校准的DRP浓度对于SWAT是不切实际的高，而校准的DRP浓度反映了使用SWAT-P的区域中的主要条件。结果表明，通过使用SWAT-P，改善了DRP损耗进入流的预测精度，以及从瓷砖排水水的DRP损耗大致估计。进一步的研究是有必要考虑排水水中的时间DRP浓度动态。在SWAT-P输入文件中定义瓷砖排水水和深含水层的DRP集中后，SWAT-P已准备好使用。此外，在SWAT-P中延伸模型输出，可视化来自排水水和深含水层的DRP损耗。 （c）2019年欧洲区域地区生态学研究中心的波兰科学院。 elsevier b.v出版。保留所有权利。

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