Start |Grid View | Author Index | View Uploaded Presentations | Meeting Information

GSA Annual Meeting in Phoenix, Arizona, USA - 2019

Paper No. 32-7
Presentation Time: 9:00 AM-5:30 PM

PLANT TRANSPIRATION INFLUENCES ON GROUNDWATER IN A SHALLOW DOLOSTONE AQUIFER


GUO, Jian1, KENNEL, Jonathan2, ISRAEL, Michael Ben3, WANNER, Philipp2 and PARKER, Beth L.2, (1)State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu, 610059, China; G360 Institute for Groundwater Research, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada, (2)G360 Institute for Groundwater Research, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada, (3)School of Engineering, University of Guelph, Guelph, ON ON N1G 2W1, Canada

The water levels logged in observation wells is an important facet of many groundwater studies. As new technics are applied in water levels monitoring equipment, the more precise the data is, the more noise we would observer in the water level fluctuations. It is well known that a wide variety of hydrologic phenomena can result in water level fluctuations, such as precipitation, barometric pressure effects, earth tides, etc. In some cases, plant transpiration can also affect the water table as long as the roots of plant uptake the groundwater, and it is important that we understand the mechanism operating simultaneously.

Through a monitoring project in the woods in Guelph, Canada, we got continuously high temporal resolution data sets including groundwater levels, barometric pressure, precipitation and tree sap flow. The site is featured shallow dolostone aquifer with groundwater depth at 2 meters below ground surface. Multilevel monitoring method is implemented for assessing water head (level) in various fracture from distinct depth within the aquifer. We set the stage for determining the relationship between tree sap flow and water levels using the diurnal component (1 cpd) of the signal. Water levels are filtered of the precipitation recharge with a high pass filter and then barometric response are removed using deconvolution method. In order to check how well our barometric removal process is working, Fourier transformation is set to graph the spectrum of water levels, barometric pressure and tree sap flow. Further wavelet analysis displays show that tree sap flow and water levels are in-phase in all the sectors in the 16–32 hour band from June to September with significant common power, which means that changes in groundwater levels correspond with tree sap flow in a inversed relation. This finding is against other literatures, which report that trees pump water and drawdown the water level in sync. At last, a discussion is made to explain the mechanism how the water is taken from the vadose zone and creating a drawup cone.

Session No. 32--Booth# 126

T150. Advances in Understanding Processes at or Near the Groundwater–Surface Water Interface (Posters)
Sunday, 22 September 2019: 9:00 AM-5:30 PM
Hall AB, North Building (Phoenix Convention Center)
Geological Society of America Abstracts with Programs. Vol. 51, No. 5
doi: 10.1130/abs/2019AM-336758
© Copyright 2019 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
Back to: T150. Advances in Understanding Processes at or Near the Groundwater–Surface Water Interface (Posters)
<< Previous Abstract | Next Abstract >>