A passive heat tracer experiment to determine the seasonal variation in residence times in a managed aquifer recharge system with DTS

Bas des Tombe, Mark Bakker, F Schaars, KJ van der Made, R Calje, L. Borst

Research output: Contribution to conferenceAbstractScientific

13 Downloads (Pure)

Abstract

Targeted provisional session N°8.01 The seasonal variation in residence times is determined in a managed aquifer recharge system using a passive heat tracer test. The managed aquifer recharge system consists of a sequence of alternating elongated recharge basins and rows of recovery wells. The temperature of both the water in the recharge basin and the surface influence the temperature in the aquifer. The flow field changes when the temperature changes, as the hydraulic conductivity is a function of the temperature. Fiber optic cables were inserted up to a depth of 20 meters with direct push equipment to measure vertical temperature profiles with DTS. In this fashion, the fiber optic cables are in direct contact with the aquifer and the disturbance of the aquifer is minimal. The measured spatial and temporal temperature variations in the subsurface were modeled with SEAWAT, a coupled flow and heat transport model. MODPATH was used to compute flow paths and residence times. During the winter, a larger fraction of the water moves through the warmer lower part of the aquifer, thereby increasing the residence time. The opposite happens during the summer, when most of the water moves through the warmer upper part of the aquifer, resulting in shorter residence times.
Original languageEnglish
Number of pages1
Publication statusPublished - 2016
Event43rd IAH congress: Groundwater and society: 60 years of IAH - le Corum, Montpellier, France
Duration: 25 Sep 201629 Sep 2016
http://www.60iah2016.org/en/programme/final-programme

Conference

Conference43rd IAH congress
Abbreviated titleIAH 2016
CountryFrance
CityMontpellier
Period25/09/1629/09/16
Internet address

Keywords

  • Groundwater
  • DTS

Fingerprint Dive into the research topics of 'A passive heat tracer experiment to determine the seasonal variation in residence times in a managed aquifer recharge system with DTS'. Together they form a unique fingerprint.

Cite this