Fast response of groundwater to heavy rainfall

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet

Authors

Groundwater recharge by precipitation is often assumed by practitioners as well as scientists to be a slow process of filtration through layers of uniform texture analogous to Darcy's law. In most basins, however, rainwater also finds its way through macropores and preferential pathways to the shallow unconfined aquifers within hours of falling. Recharge phases may extend over several days, increasing groundwater levels, stored volume and hence baseflows into adjoining rivers. In this study, groundwater recharge and storage are computed from baseflow as separated with a nonlinear reservoir algorithm from time series of daily flows at gauging stations in northern Germany. Results are compared to groundwater level fluctuation in the catchments and to daily seepage rates measured in a lysimeter station. Peak times of the fast transfer of rain water through the vadose zone are generally the same. However, while recharge from baseflow ends when baseflow assumes its typical recession, the attenuation of lysimeter seepage may last much longer. The volume of lysimeter seepage is generally higher than the recharge in catchments due not only to different vegetation but also to rim effects impeding direct runoff. Furthermore, the lysimeter walls allow vertical fluxes only. Without further evidence or improved devices, lysimeter seepage should therefore not be indicated as groundwater recharge for the site or catchment. Findings also indicate that the shape of derived recharge unit responses is practically time invariant but with a strong seasonal variation in the recharge-rainfall ratio of precipitation events.

OriginalspracheEnglisch
ZeitschriftJournal of Hydrology
Jahrgang571
Seiten (von - bis)837-842
Anzahl der Seiten6
ISSN0022-1694
DOIs
PublikationsstatusErschienen - 01.04.2019

DOI

Zuletzt angesehen

Publikationen

  1. Modeling the C(o)urse of Privacy-critical Location-based Services
  2. Control of Permanent Magnet Synchronous Motors for Track Applications
  3. Modelling habitat and spatial distribution of an endangered longhorn beetle
  4. The effect of organic acids and alcohols on precipitation of phosphate using calcined seashell powder
  5. Characterization of the microstructure evolution in IF-Steel and AA6016 during plane-strain tension and simple shear
  6. Hommage to the unknown viewers
  7. Towards a Sustainable Use of Phosphorus
  8. Decolonizing Otherness through a Transcultural Lens: Conclusion
  9. Putting sustainable chemistry and resource use into context
  10. Interactivity, Interpassivity and Possibilities Beyond Dichotomy
  11. Implikationen der Digitalisierung für die Organisation
  12. Dynamische Mathematik
  13. Attribution of Egoistic Versus Altruistic Motives to Acts of Helping
  14. An image morphing method for 3D reconstruction and FE-analysis of pore networks in thermal spray coatings
  15. Deciphering the speed of link: Experimental Evidence of a rapid increase in soil respiration following the onset of photosynthesis
  16. Mythen der Edda in der deutschen Dichtung
  17. Efficient Classification of Images with Taxonomies
  18. Mining User-Generated Financial Content to Predict Stock Price Movements
  19. Entry, Exit and Productivity
  20. Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys
  21. Simultaneity and temporal order perception: different sides of the same coin?
  22. Migration's lines of flight.
  23. Introduction to The Psychology of Entrepreneurship
  24. Multiple import sourcing.
  25. Does Sharing with Neighbours Work? Accounts of Success and Failure from Two German Housing Experimentations
  26. Consolidation period in new ventures
  27. The educational benefits of technological competence
  28. The Cox ring of the space of complete rank two collineations