scholarly journals Redox Interfaces Produce Halos of Altered Biogeochemical Reactivity in Alluvial Groundwater Sediments

2020 ◽  
Author(s):  
Kristin Boye ◽  
Tristan Babey ◽  
Naresh Kumar ◽  
Vincent Noël ◽  
Zach Perzan ◽  
...  
Keyword(s):  
Alluvial Groundwater

The use of regional and alluvial groundwater by riparian trees in the wet‐dry tropics of northern Australia.

2021 ◽  
Author(s):  
Caroline A. Canham ◽  
Clément Duvert ◽  
Leah S. Beesley ◽  
Michael M. Douglas ◽  
Samantha A. Setterfield ◽  
...  
Keyword(s):  
Northern Australia ◽  
Dry Tropics ◽  
Riparian Trees ◽  
Alluvial Groundwater

Intrinsic bioremediation in a solvent-contaminated alluvial groundwater

1997 ◽  
Vol 18 (2-3) ◽  
pp. 177-188 ◽  
Author(s):  
R A Williams ◽  
K A Shuttle ◽  
J L Kunkler ◽  
E L Madsen ◽  
S W Hooper
Keyword(s):  
Intrinsic Bioremediation ◽  
Alluvial Groundwater

Alluvial groundwater recharge estimation in semi-arid environment using remotely sensed data

2017 ◽  
Vol 548 ◽  
pp. 1-15 ◽  
Author(s):  
Victor Hugo R. Coelho ◽  
Suzana Montenegro ◽  
Cristiano N. Almeida ◽  
Bernardo B. Silva ◽  
Leidjane M. Oliveira ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
Arid Environment ◽  
Remotely Sensed ◽  
Remotely Sensed Data ◽  
Alluvial Groundwater ◽  
Recharge Estimation ◽  
Semi Arid

scholarly journals A multi-tracer approach to constraining artesian groundwater discharge into an alluvial aquifer

2017 ◽  
Author(s):  
Charlotte P. Iverach ◽  
Dioni I. Cendón ◽  
Karina T. Meredith ◽  
Klaus M. Wilcken ◽  
Stuart I. Hankin ◽  
...  
Keyword(s):  
Water Balance ◽  
Groundwater Resources ◽  
Groundwater Discharge ◽  
Alluvial Aquifer ◽  
Balance Model ◽  
Isotopic Tracers ◽  
Artesian Basin ◽  
Alluvial Groundwater ◽  
Geochemical Analyses ◽  
A Site

Abstract. Understanding pathways of recharge to alluvial aquifers is important for maintaining sustainable access to groundwater resources. Water balance modelling is often used to proportion recharge components and guide sustainable groundwater allocations. However, it is not common practice to use hydrochemical evidence to inform and constrain these models. Here we compare geochemical versus water balance model estimates of artesian discharge into an alluvial aquifer, and demonstrate why multi-tracer geochemical analyses should be used as a critical component of water budget assessments. We selected a site in Australia where the Great Artesian Basin (GAB), the largest artesian basin in the world, discharges into the Lower Namoi Alluvium (LNA), an extensively modelled aquifer, to convey the utility of our approach. Water stable isotopes (ẟ18O and ẟ2H) and the concentrations of Na+ and HCO3− suggest a continuum of mixing in the alluvial aquifer between the GAB (artesian component) and surface recharge, whilst isotopic tracers (3H, 14C and 36Cl) indicate that the alluvial groundwater is a mixture of groundwaters with residence times of

Estimation of natural background level of Cr(VI) in ultramafic rock related alluvial aquifers of central Greece: Comparison of results by statistical and deterministic preselection method approaches

2020 ◽  
Author(s):  
Ariadne Argyraki ◽  
Konstantina Pyrgaki ◽  
Efstratios Kelepertzis ◽  
Fotini Botsou ◽  
Ifigeneia Megremi
Keyword(s):  
Statistical Approach ◽  
Ultramafic Rock ◽  
Anthropogenic Activities ◽  
Background Level ◽  
Anthropogenic Factors ◽  
Background Concentration ◽  
Natural Background ◽  
Central Greece ◽  
Alluvial Groundwater ◽  
Definition Of

<p>The definition of natural background concentration levels (NBLs) of geogenic trace metals in groundwater is a challenging issue, particularly in areas where anthropogenic activities are also present. The estimation of NBLs, in combination with environmental quality standards, in such areas is particularly important for the establishment of relevant groundwater threshold values. Over 100 groundwater samples were collected and analysed from four Cr(VI) impacted, alluvial groundwater bodies of central Greece during two consecutive hydrologic years. A common feature of the examined aquifers is the presence of weathered ultramafic rock material in the alluvial sediments. Most sampled boreholes (79 %) are used for irrigation, whereas 21 % of them are used for domestic drinking water supply. Hexavalent Cr concentrations in groundwater, ranging from below detection limit to 430 μg/L, have been attributed to both geogenic and anthropogenic factors. The scope of the present study is to estimate the NBL of Cr(VI) by using a classical statistical approach and a deterministic preselection method and test the comparability of results. In the statistical approach the distribution of samples versus Cr(VI) concentrations has been explored by using probability plots. In this way, the concentration variations within the examined groundwater bodies can be studied and the presence of sub-populations becomes evident by breaks in the slope. In the instance of the preselection method, the concentrations of a set of additional analyzed parameters in ground water, including major water ions and nitrate as well as dissolved oxygen, have been taken into account in order to categorize the samples into two groups of low and high anthropogenic influence, respectively. The comparability of the results derived by the two approaches are discussed in the context of EU Water Framework Directive.</p>

scholarly journals Sensitivity of hydrologic and geologic parameters on recharge processes in a highly heterogeneous, semi-confined aquifer system

2020 ◽  
Vol 24 (5) ◽  
pp. 2437-2456
Author(s):  
Stephen R. Maples ◽  
Laura Foglia ◽  
Graham E. Fogg ◽  
Reed M. Maxwell
Keyword(s):  
Transition Probability ◽  
Groundwater Resources ◽  
Sensitivity Analyses ◽  
Aquifer Recharge ◽  
Geostatistical Model ◽  
Large Variability ◽  
Aquifer Systems ◽  
Alluvial Groundwater ◽  
Recharge Rates ◽  
Groundwater Basins

Abstract. An increasing reliance on groundwater resources has been observed worldwide during the past 50–70 years and has led to unsustainable groundwater abstraction in many regions, especially in semi-arid and arid alluvial groundwater basins. Managed aquifer recharge (MAR) has been promoted to replenish overdrafted groundwater basins and augment surface water supply. However, MAR feasibility in alluvial groundwater basins is complicated by complex geologic architecture that typically includes laterally continuous, fine-texture confining units that can impede both recharge rates and regional propagation of increases in the hydraulic head. A greater feasibility of MAR hinges on identifying locations where rapid, high-volume recharge that provides regional increases in pressure head are possible, but relatively little research has evaluated the factors that control MAR feasibility in alluvial groundwater basins. Here, we combine a transition probability Markov chain geostatistical model of the subsurface geologic heterogeneity of the eastern side of the northern Central Valley, California, with the three-dimensional, variably saturated water flow code ParFlow to explore the variability of MAR feasibility in this region. We use a combination of computationally efficient local- and global-sensitivity analyses to evaluate the relative importance of factors that contribute to MAR feasibility. A novel proxy parameter approach was used to describe the configuration and proportions of subsurface hydrofacies and the water table depth for sensitivity analyses, and results suggest that recharge potential is relatively more sensitive to the variability of this proxy parameter than to the variability of individual hydrofacies hydraulic properties. Results demonstrate that large variability of MAR feasibility is typical for alluvial aquifer systems and that outsized recharge rates are possible in select locations where interconnected, coarse-texture hydrofacies occur.

Establishment of Populus deltoides Under Simulated Alluvial Groundwater Declines

1993 ◽  
Vol 130 (2) ◽  
pp. 274 ◽  
Author(s):  
Charles A. Segelquist ◽  
Michael L. Scott ◽  
Gregor T. Auble
Keyword(s):  
Populus Deltoides ◽  
Alluvial Groundwater

Thermal heterogeneity in the hyporheic zone of a glacial floodplain

2001 ◽  
Vol 58 (7) ◽  
pp. 1319-1335 ◽  
Author(s):  
Florian Malard ◽  
Alain Mangin ◽  
Urs Uehlinger ◽  
J V Ward
Keyword(s):  
Surface Waters ◽  
Hyporheic Zone ◽  
Ecosystem Processes ◽  
Seasonal Patterns ◽  
Time Lags ◽  
Channel Network ◽  
Alluvial Groundwater ◽  
Summer Temperatures ◽  
Thermal Heterogeneity ◽  
Different Sources

We examined the thermal regime of surface and hyporheic waters at three kryal sites and four krenal streams within the channel network of a glacial floodplain. Temperature was continuously measured for 1 year in the surface stream and at sediment depths of 30 and 80 cm. The vertical pattern of water temperature was strongly influenced by the direction and intensity of surface water – groundwater exchanges. At sites characterized by strong downwelling of surface waters, the thermal regimes of surface and hyporheic waters were virtually identical. In contrast, inputs of groundwater substantially increased mean summer temperatures in the hyporheic zone of the main kryal channel, decreased summer temperatures in the hyporheic zone of krenal streams, and elevated hyporheic temperatures of all stream types during winter. Groundwater from different sources had dramatically different effects on the seasonal regime of temperature in the hyporheic zone. Inflow of shallow alluvial groundwater had minimal effects on seasonal patterns of hyporheic temperature, whereas upwelling from deep alluvial and hillslope aquifers resulted in significant time lags and differences in seasonal amplitudes between surface and hyporheic temperatures. The unexpectedly high thermal heterogeneity of hyporheic waters presumably sustains biodiversity and stimulates ecosystem processes in this glacial floodplain.

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