Ype van der Velde in HESS
Ype van der Velde, Assistant Professor in Hydrology at Earth and Climate Cluster of the Earth and Life Sciences Faculty of Vrije Universiteit Amsterdam, reticently co-authored a scientific article which was published in Hydrology and Earth System Sciences (HESS). The study refers to the high-frequency monitoring of water fluxes and nutrient loads to assess the effects of controlled drainage on water storage and nutrient transport.
High nitrogen (N) and phosphorus (P) fluxes from upstream agriculture threaten aquatic ecosystems in surface waters and estuaries. Controlled drainage has been recognized as an effective option to optimize soil moisture conditions for agriculture and to reduce unnecessary losses of fresh water and nutrients. We tested this method by installing control structures with adjustable overflow levels into subsurface tube drain systems. The results showed that the introduced controlled drainage did reduce the drain discharge and increased the groundwater storage in the field. However, we also found that controlled drainage did not have the expected positive effects for nutrient losses to surface waters.
Rozemeijer, J. C., Visser, A., Borren, W., Winegram, M., van der Velde, Y., Klein, J., and Broers, H. P.: High-frequency monitoring of water fluxes and nutrient loads to assess the effects of controlled drainage on water storage and nutrient transport, Hydrol. Earth Syst. Sci., 20, 347-358, doi:10.5194/hess-20-347-2016, 2016.