Transit Times of Soil Water in Thick Soil and Weathered Gneiss Layers Using Deuterium Excess Modelling

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Edition
Call Number 556.324 ABE c
ISBN/ISSN 9781907161209
Author(s) Kabeya, Naoki
Shimizu, Akira
Tamai, Koji
Iida, Shin Ichi
Shimizu, Takanori
Subject(s) Deuterium excess
Soil water
Mean transit time of water
Heavily weathered gneiss
Classification 556.324
Series Title Conceptual and Modelling Studies of Integrated Groundwater, Surface Water, and Ecological Systems
GMD Buku_Teks
Language English
Publisher IAHS Press
Publishing Year 2011
Publishing Place Oxford
Collation Hlm. 163-168
Abstract/Notes Four tension-lysimeter plots were installed in a small gneiss watershed (Tsukuba Experimental Watershed), that is covered by a thick brown forest soil layer and a thick weathered gneiss layer. Soil water was extracted at eight depths ranging from 10-400 cm for each tension-lysimeter and the stable isotope ratios of the soil solution were analysed. Detailed observations of the subsurface structure were also conducted. The mean transit time (MTT) of soil water in each depth increment was estimated using the modified sine-wave method, using tension-lysimeter data and variation in the throughfall deuterium excess (d) value variation. The MTT of soil water extracted from a brown forest soil layer increased in direct proportion to sampling depth. However, the MTT of soil water extracted from the heavily weathered gneiss layer exhibited no clear changes as sampling depth increased.
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