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Tile drain discharge measured at four adjacent systematically tile drained catchments

Research output: Contribution to conferencePosterResearch

More than 50 % of Danish agricultural areas are expected to be artificial tile drained. Transport of water and nutrients through the tile drain system to the aquatic environment is expected to be significant. For different mitigation strategies such as constructed wetlands, an exact knowledge of the water load coming from the tile drainage system is therefore essential. This study aims at understanding the tile drain discharge processes from four adjacent drained agricultural fields. During a period of more than two years hourly values of discharge was measured at four systematically artificially tile drained adjacent catchments ranging in size from 34 to 120 ha using an electromagnetic water meter. A simple water balance model was used in order to calculate net precipitation and thereby the fraction of infiltration water out of the root zone that either could recharge to the groundwater or infiltrate into the tile drain system. An electromagnetic induction (EMI) survey was conducted at the catchments in order to investigate the spatial variability of the soil properties. During the measurement period, the discharge was characterized by a dynamic behavior during winter months and a level of almost at zero during summer months. Yearly discharge varied considerable from year to year mainly depending on differences in precipitation. The relation of infiltrating water out of the root zone to the tile drain discharge varied considerably from year to year, but also between the different catchment within the same year despite the relatively similarity between the catchments. During wintertime most of the water leaving the root zone was captured by the tile drain system, but also here large differences were seen between years and between the different catchments. The work opens of for the possibilities to understand the dynamic of tile drain discharge on a temporal as well as spatial scale.
Original languageEnglish
Publication year8 Jan 2019
Publication statusPublished - 8 Jan 2019
Event2018-2019 International Soils Meeting: Soils Across Latitudes - San Diego, United States
Duration: 6 Jan 20199 Jan 2019

Conference

Conference2018-2019 International Soils Meeting
CountryUnited States
CitySan Diego
Period06/01/201909/01/2019

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