I am pleased to announce the publication of our commentary on Terrestrial water fluxes dominated by transpiration by Jasechko et al. in Nature:
Coenders-Gerrits, A.M.J., Van der Ent, R.J., Bogaard, T.A., Wang-Erlandsson, L., Hrachowitz, M., and Savenije, H.H.G. (2014): Uncertainties in transpiration estimates, Nature, 506, E1-E2.
Coenders-Gerrits, A.M.J., Hopp, L., Savenije, H.H.G., and Pfister, L. (2013): The effect of spatial throughfall patterns on soil moisture patterns at the hillslope scale, Hydrology and Earth System Sciences, 17, 1749-1763.
Improving the understanding of the controls on subsurface stormflow generation has been the goal of numerous experimental and modeling studies. However, the effect of the spatial variability of throughfall on soil moisture patterns and subsurface stormflow (SSF) generation has not yet been studied in detail. The objectives of this study are three-fold: (1) to investigate the influence of a spatially variable throughfall pattern on soil moisture; (2) to investigate if soil moisture patterns reflect a balance between a throughfall and bedrock topography patterns; and (3) to investigate how this balance changes when soil depth, storm size and slope angle are varied. Virtual experiments are used to address these questions. A virtual experiment is a numerical experiment driven by collective field intelligence. It provides a learning tool to investigate the effect of individual processes in a complex Continue reading
Conveners: Alexander Zimmermann, Miriam Coenders-Gerrits
Co-Conveners: Anke Hildebrandt, Jan Friesen, Pilar Llorens
During the passage of rain through a forest canopy water is redistributed. Most of the water reaches the forest floor as throughfall, some as stemflow, and another fraction of the rain is captured by the canopy and eventually evaporates. Previous studies showed that spatial patterns of throughfall exhibit a pronounced temporal stability in some forests. Yet, whether these patterns influence soil moisture patterns in a way that matters for plant growth or the soils biota is currently not known. Continue reading
The Budyko framework allows estimation of actual evapotranspiration based on the balance between the supply of water and energy (they are usually represented by precipitation and potential evaporation). It is a steady state model and has been widely used to examine the terrestrial water budget at decadal and catchment scales. For its simplicity, the model is extremely powerful with model performance similar to that of complex hydrological models (when applied at the appropriate scales).
“Drinkwater raakt op: rivieren straks te vuil om nog te zuiveren” kopte de Telegraaf op de voorpagina op woensdag 3 oktober naar aanleiding van het RIVM/Deltares rapport over de effecten van klimaatverandering op de waterkwaliteit bij innamepunten voor drinkwater. Vier Delftse onderzoekers (TU Delft en UNESCO-IHE) menen dat het zo’n vaart niet zal lopen. Het rapport houdt volgens hen te weinig rekening met de héle watercyclus en met de Nederlandse innovatiekracht op het gebied van drinkwater- en afvalwaterzuivering. Wij hebben in Nederland het beste kraanwater ter wereld, ook nog in 2050.
Tsiko, C.T., Makurira, H., Gerrits, A.M.J., and Savenije, H.H.G. (2012): Measuring forest floor and canopy interception in a savannah ecosystem, Physics and Chemistry of the Earth, Vol. 47-48, 122-127