The hydrological response of heavy clay grassland soils to rainfall in south-west England using delta2H

Rapid Communications in Mass Spectrometry : RCM
Steven J GrangerSue M White

Abstract

Stable isotopes of water have been previously used in catchment studies to separate rain-event water from pre-event groundwater. However, there are a lack of studies at the smaller scale looking at the separation of event water from pre-event water. This is particularly relevant for heavy clay soil systems through which the movement of water is uncertain but is thought to be rainwater-dominated. The data presented here were collected at a rural site in the south-west of England. The historic rainfall at the site was isotopically varied but similar to the global meteoric water line, with annual weighted means of -37 per thousand for delta(2)H and -5.7 per thousand for delta(18)O and with no seasonal variation. Drainage was sampled from the inter-flow (surface runoff + lateral through-flow) and drain-flow (55 cm deep mole drains) pathways of two 1 ha lysimeters during two rainfall events, which had delta(2)H values of -68 per thousand and -92 per thousand, respectively. The delta(2)H values of the lysimeter drainage water suggest that there was no contribution of event water during the first, small discharge (Q) event; however, the second larger event did show isotopic variation in delta(2)H values negatively related to Q indicat...Continue Reading

Citations

May 1, 2013·The Science of the Total Environment·Richard C SandfordPaul J Worsfold
Oct 5, 2016·The Science of the Total Environment·Steven J GrangerAdrian L Collins
Jul 9, 2013·Perspectives in Public Health·Judy WhiteJane South
May 16, 2015·Journal of Applied Physiology·Justin E HarbisonAmy Luke

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