SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Impact of filters to reduce phosphorus losses: Field observations and modelling tests in tile-drained lowland catchments 
Authors:Bauwe, A., P. Kahle and B. Lennartz 
Volume (Issue):11(12) 
Article ID:2638 
URL (non-DOI journals): 
Broad Application Category:pollutant only 
Primary Application Category:phosphorus cycling/loss and transport 
Secondary Application Category:none 
Watershed Description:3,041 km^2 Warnow River, which discharges into the Baltic Sea near the City of Rostock in northeastern Germany. 
Calibration Summary: 
Validation Summary: 
General Comments:The SWAT model outputs used in this study are based on simulation results reported in the following previous study: Bauwe, A., K.-U. Eckhardt and B. Lennartz. 2019. Predicting dissolved reactive phosphorus in tile-drained catchments using a modified SWAT model. Ecohydrology & Hydrobiology. 19(2): 198-209. 
Abstract:In this study, we analyzed Dissolved Reactive Phosphorus (DRP) and Total Phosphorus (TP) concentration dynamics over two years in surface waters of five nested catchments in northeastern Germany. Based on this, we constructed a filter box filled with iron-coated sand for Phosphorus (P) removal at the edge of a tile-drained field. Results of the filter box experiment were used for a model scenario analysis aiming at evaluating the P removal potential at catchment scale. DRP and TP concentrations were generally low but they exceeded occasionally target values. Results of the filter box experiment indicated that 28% of the TP load could be retained but the DRP load reduction was negligible. We assume that DRP could not be reduced due to short residence times and high flow dynamics. Instead, particulate P fractions were probably retained mechanically by the filter material. The scenario analysis revealed that the P removal potential of such filters are highest in areas, in which tile drainage water is the dominant P source. At a larger spatial scale, in which other P (point) sources are likewise important, edge-of-field P filters can only be one part of an integrated catchment strategy involving a variety of measures to reduce P losses. 
Keywords:artificial drainage; phosphorus removal; total phosphorus; dissolved reactive phosphorus; eutrophication; modeling; iron-coated sand; edge-of-field filter