Application of SWITCH, a model for sediment-water exchange of nutrients, to Lake Veluwe in The Netherlands
Application of SWITCH, a model for sediment-water exchange of nutrients, to Lake Veluwe in The Netherlands
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DOI：
10.1007/bf00050749
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发表时间：
1993-03
期刊：
影响因子：
2.6
通讯作者：
J. G. C. Smits;D. van der Molen
中科院分区：
文献类型：
--
作者：
J. G. C. Smits;D. van der Molen
本文介绍了一种用于沉积物-水界面营养盐通量预测的模型-NH_4 ~-NH_3 ~-NH_4 ~-NH_3 ~-NH_2 ~-NH_3应用于Veluwe湖的沉积物数据的结果进行了介绍和讨论。ESTA计算的基础上逐步稳定状态的方法的好氧层和反硝化层的厚度。利用质量平衡方程对沉积物和孔隙水中的碎屑、铵、硝酸盐和磷酸盐的浓度进行了动态模拟，对Veluwe湖的数据分析显示出很大的空间异质性。这对侧重于湖泊淤泥质部分的ECO 2校准来说是一个主要缺点。结果表明，该模式真实和一致地模拟层厚度，浓度和质量通量与传输和转换过程。该模型似乎有潜力描述两个季节性模式和发展的长期。ESTA计算强烈增加磷酸盐回流通量，总减少顶部沉积物。该模型中的一个重要假设是，在还原沉积层中沉淀的磷酸盐被转移到氧化层并瞬时溶解。这导致沉积物中磷含量的减少，但也保持了高释放率的磷后，减少了韦卢韦湖的外部磷负荷。模型结果和上覆水的质量平衡研究表明，磷的去除到更深的沉积物层被低估或稀释的沉积物发生的结果，沉积。
The formulations of SWITCH, a model for prediction of nutrient fluxes across the sediment-water interface, are presented. Results of the application to data on the sediment of Lake Veluwe are presented and discussed.SWITCH calculates the thicknesses of the aerobic and denitrifying layers on the basis of a step-wise steady state approach. The concentrations of detritus, ammonium, nitrate and phosphate in the sediments and the pore water are simulated dynamically using mass balance equations.Analysis of the data for Lake Veluwe show large spatial heterogeneity. This presents a major drawback for the calibration of SWITCH, which focused on the silty part of the lake. The results show that the model simulates realistically and consistently layer thicknesses, concentrations and mass fluxes connected with the transport and conversion processes. The model appears to have potential for describing both seasonal patterns and developments on the long term.SWITCH calculates strongly increased phosphate return fluxes, following total reduction of the top sediments. An important hypothesis in the model is that phosphate precipitated in reduced sediment layers is transferred to the oxidized layer and dissolves instantaneously. This results in a decrease of the phosphorus content of the sediment, but also maintains high release rates of phosphorus after the reduction of the external phosphorus loading of Lake Veluwe. Model results and mass balance studies for the overlying water indicate that the removal of phosphorus to deeper sediment layers is underestimated or that dilution of the sediments occurs as the result of sedimentation.