scholarly journals California GAMA Program: Groundwater Age Simulation and Deconvolution Methods for Interpretation of 3H-3He Data

2010 ◽  
Author(s):  
S Carle ◽  
J Moran ◽  
B Esser
Keyword(s):  
Groundwater Age ◽  
Age Simulation

CHARACTERIZING UNCONFINED AQUIFERS USING SEEP- AND STREAM-BASED MEASUREMENTS OF GROUNDWATER AGE

2016 ◽  
Author(s):  
D. Kip Solomon ◽  
◽  
Troy E. Gilmore ◽  
David P. Genereux ◽  
Jennifer Georgek ◽  
...  
Keyword(s):  
Groundwater Age ◽  
Unconfined Aquifers

INSIGHTS FROM GROUNDWATER AGE TRACERS INTO SOURCES OF WATER TO THE MISSISSIPPI RIVER VALLEY ALLUVIAL AQUIFER

2020 ◽  
Author(s):  
Michael Gratzer ◽  
◽  
Katherine Knierim ◽  
James A. Kingsbury ◽  
Samantha R. Wacaster ◽  
...  
Keyword(s):  
Mississippi River ◽  
Groundwater Age ◽  
Alluvial Aquifer ◽  
River Valley ◽  
Mississippi River Valley

scholarly journals Application of chlorofluorocarbons (CFCs) to estimate the groundwater age at a headwater wetland in Ichikawa City, Chiba Prefecture, Japan

2013 ◽  
Vol 4 (3) ◽  
pp. 291-302 ◽  
Author(s):  
Zhiwei Han ◽  
Changyuan Tang ◽  
Jingqiu Piao ◽  
Xing Li ◽  
Yingjie Cao ◽  
...  
Keyword(s):  
Groundwater Age ◽  
Chiba Prefecture ◽  
Headwater Wetland

scholarly journals Groundwater age, brine migration, and large-scale solute transport in the Alberta Basin, Canada

Geofluids ◽  
2015 ◽  
Vol 15 (4) ◽  
pp. 608-620 ◽  
Author(s):  
I. Gupta ◽  
A. M. Wilson ◽  
B. J. Rostron
Keyword(s):  
Solute Transport ◽  
Large Scale ◽  
Groundwater Age ◽  
Brine Migration ◽  
Alberta Basin

Groundwater age from multi-level bores: What it can tell about the aquifers

2021 ◽  
Author(s):  
Uwe Morgenstern ◽  
Zara Rawlinson
Keyword(s):  
Groundwater Flow ◽  
Groundwater Recharge ◽  
Sea Level ◽  
Preferential Flow ◽  
Groundwater Age ◽  
Geological Processes ◽  
Recharge Sources ◽  
Transient Electromagnetic ◽  
Geophysical Surveys ◽  
Multi Level

<p>Geologic data to provide information on the functioning of aquifers is often scars. For the aquifers underlying the Heretaunga Plains, Hawkes Bay, one of New Zealand’s most important groundwater systems, we used groundwater age (tritium, SF6, 14C) to inform the geologic model and to provide information on groundwater flow through alternating strata of permeable river gravel beds and fine impermeable beds that form an interconnected unconfined–confined aquifer system with complex groundwater flow processes.</p><p>The aquifers are a result of geological processes responding to climate change cycles from cold glacial when sea level was more than 100m below present sea level, to warm interglacial periods with sea level similar to present day. Glacial climate strata are river gravel, sand and silt deposits and include the artesian aquifers. The interglacial strata form the aquicludes and are marine sand, silt, and clay deposits with interbedded estuarine, swamp and coastal fluvial silt, clay, peat and gravel deposits.</p><p>We have re-visited tracer data sampled during the drilling of multi-level observation well in the early 1990s, and collected new samples from these multi-level bores in order to understand in 3D the groundwater recharge sources, groundwater recharge and flow rates, connection to the rivers, and potential groundwater discharge out to sea. Consistently young water (c. 25 years) at depth greater than 100m indicates preferential flow paths, likely related to paleo-river channels. The flow pattern obtained from the water tracer data improves the geologic information from the drill-holes, and fits with information from recent airborne transient electromagnetic (SkyTEM) geophysical surveys.</p>

scholarly journals Calibration of a transient transport model to tritium data in streams and simulation of groundwater ages in the western Lake Taupo catchment, New Zealand

2013 ◽  
Vol 17 (3) ◽  
pp. 1217-1227 ◽  
Author(s):  
M. A. Gusyev ◽  
M. Toews ◽  
U. Morgenstern ◽  
M. Stewart ◽  
P. White ◽  
...  
Keyword(s):  
New Zealand ◽  
Transport Model ◽  
Groundwater Age ◽  
Uniform Grid ◽  
Groundwater System ◽  
Small Surface ◽  
Streams And Rivers ◽  
Groundwater Levels ◽  
Transient Transport ◽  
Western Lake

Abstract. Here we present a general approach of calibrating transient transport models to tritium concentrations in river waters developed for the MT3DMS/MODFLOW model of the western Lake Taupo catchment, New Zealand. Tritium has a known pulse-shaped input to groundwater systems due to the bomb tritium in the early 1960s and, with its radioactive half-life of 12.32 yr, allows for the determination of the groundwater age. In the transport model, the tritium input (measured in rainfall) passes through the groundwater system, and the simulated tritium concentrations are matched to the measured tritium concentrations in the river and stream outlets for the Waihaha, Whanganui, Whareroa, Kuratau and Omori catchments from 2000–2007. For the Kuratau River, tritium was also measured between 1960 and 1970, which allowed us to fine-tune the transport model for the simulated bomb-peak tritium concentrations. In order to incorporate small surface water features in detail, an 80 m uniform grid cell size was selected in the steady-state MODFLOW model for the model area of 1072 km2. The groundwater flow model was first calibrated to groundwater levels and stream baseflow observations. Then, the transient tritium transport MT3DMS model was matched to the measured tritium concentrations in streams and rivers, which are the natural discharge of the groundwater system. The tritium concentrations in the rivers and streams correspond to the residence time of the water in the groundwater system (groundwater age) and mixing of water with different age. The transport model output showed a good agreement with the measured tritium values. Finally, the tritium-calibrated MT3DMS model is applied to simulate groundwater ages, which are used to obtain groundwater age distributions with mean residence times (MRTs) in streams and rivers for the five catchments. The effect of regional and local hydrogeology on the simulated groundwater ages is investigated by demonstrating groundwater ages at five model cross-sections to better understand MRTs simulated with tritium-calibrated MT3DMS and lumped parameter models.

scholarly journals Rethinking groundwater age

2020 ◽  
Vol 13 (9) ◽  
pp. 592-594
Author(s):  
Grant Ferguson ◽  
Mark O. Cuthbert ◽  
Kevin Befus ◽  
Tom Gleeson ◽  
Jennifer C. McIntosh
Keyword(s):  
Groundwater Age
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