naa a22 4500 510749216 CHVBK 20180411083058.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11270-013-1581-6 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1581-6 Analysis of Consecutive Events for Nutrient and Sediment Treatment in Field-Monitored Bioretention Cells [Elektronische Daten] [Robert Brown, Francois Birgand, William Hunt] Previous research demonstrated that nutrient treatment in conventionally drained bioretention cells is dependent upon temperature and varying wetting and drying regimes in the media. This study examines the influence that previous events have on outflow concentrations by analyzing flow-weighted composite samples from four to six consecutive events during three different seasons for two sets of field-monitored bioretention cells in Nashville, NC. The bioretention cells had different media depths (0.6-m versus 0.9-m). As a means to analyze performance from consecutive events, the evolution of cumulative pollutant loads was presented by plotting cumulative load versus cumulative volume. This method of presenting water quality data allows for the direct analysis of event mean concentrations, load reduction, and volume reduction with one graph, as well as describing the seasonal impacts and impacts from consecutive events. Runoff and outflow concentrations were also correlated to media temperature and rainfall characteristics. The overall results of this study showed that conventionally drained bioretention cells mainly convert organic nitrogen, the predominant source of nitrogen in runoff, into nitrate in the aerobic environment present in the media. Nitrate is then exported from the media during subsequent events. The greatest export occurred during the warmer months because higher media temperatures increased microbial activity. Pollen and leaf litter were identified as organic nitrogen and total phosphorus sources because of elevated runoff concentrations that occurred in the spring and autumn. Based on these results, future bioretention studies should strongly consider monitoring consecutive events and this method of data analysis, as they reveal internal processes and allow researchers to draw conclusions that independent event monitoring could not. Springer Science+Business Media Dordrecht, 2013 Bioretention nationallicence Stormwater nationallicence Nutrients nationallicence Nitrogen nationallicence Phosphorus nationallicence Water quality sampling nationallicence Brown Robert Department of Biological and Agricultural Engineering, North Carolina State University, Campus Box 7625, 27695-7625, Raleigh, NC, USA aut Birgand Francois Department of Biological and Agricultural Engineering, North Carolina State University, Campus Box 7625, 27695-7625, Raleigh, NC, USA aut Hunt William Department of Biological and Agricultural Engineering, North Carolina State University, Campus Box 7625, 27695-7625, Raleigh, NC, USA aut Water, Air, & Soil Pollution Springer Netherlands 224/6(2013-06-01), 1-14 0049-6979 224:6<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1581-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1581-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Brown Robert Department of Biological and Agricultural Engineering, North Carolina State University, Campus Box 7625, 27695-7625, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Birgand Francois Department of Biological and Agricultural Engineering, North Carolina State University, Campus Box 7625, 27695-7625, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Hunt William Department of Biological and Agricultural Engineering, North Carolina State University, Campus Box 7625, 27695-7625, Raleigh, NC, USA aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/6(2013-06-01), 1-14 0049-6979 224:6<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer