scholarly journals A MODELING STUDY OF PERCHED WATER PHENOMENA IN THE VADOSE ZONE

1998 ◽  
Author(s):  
A.C. RITCEY AND G.S. BODVARSSON Y.S. WU
Keyword(s):  
Vadose Zone ◽  
Perched Water ◽  
Modeling Study

AUTOMATIC SAMPLING OF PERCHED WATER FROM VADOSE ZONE SHALLOW WELLS

1998 ◽  
Vol 14 (4) ◽  
pp. 399-406
Author(s):  
N. R. Rainwater ◽  
R. E. Yoder ◽  
J. B. Wilkerson ◽  
B. D. Russell
Keyword(s):  
Vadose Zone ◽  
Perched Water ◽  
Automatic Sampling ◽  
Shallow Wells

scholarly journals Perched-Water Evaluation for the Deep Vadose Zone Beneath the B, BX, and BY Tank Farms Area of the Hanford Site

2013 ◽  
Author(s):  
Michael J. Truex ◽  
Martinus Oostrom ◽  
KC Carroll ◽  
Glen B. Chronister
Keyword(s):  
Vadose Zone ◽  
Hanford Site ◽  
Perched Water

scholarly journals Modelling Recharge from Irrigation Developments with a Perched Water Table and Deep Unsaturated Zone

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 944 ◽  
Author(s):  
Glen R. Walker ◽  
Dougal Currie ◽  
Tony Smith
Keyword(s):  
Vadose Zone ◽  
Numerical Models ◽  
Environmental Risks ◽  
Time Lags ◽  
New Developments ◽  
Perched Water ◽  
Perched Water Table ◽  
Water Tables ◽  
Temporal And Spatial ◽  
Parameter Ranges

Modelling of recharge under irrigation zones for input to groundwater modelling is important for assessment and management of environmental risks. Deep vadose zones, when coupled with perched water tables, affect the timing and magnitude of recharge. Despite the temporal and spatial complexities of irrigation areas; recharge in response to new developments can be modelled semi-analytically, with most outputs comparing well with numerical models. For parameter ranges relevant to the western Murray Basin in southern Australia, perching can reduce the magnitude of recharge relative to irrigation accessions and will cause significant time lags for changes to move through vadose zone. Recharge in the vicinity of existing developments was found to be similar to that far from existing developments. This allows superposition to be implemented spatially for new developments, thus simplifying estimation of recharge. Simplification is further aided by the use of exponential approximants for recharge responses from individual developments.

scholarly journals Modelling Groundwater Returns to Streams From Irrigation Areas with Perched Water Tables

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 956 ◽  
Author(s):  
Dougal Currie ◽  
Tariq Laattoe ◽  
Glen Walker ◽  
Juliette Woods ◽  
Tony Smith ◽  
...  
Keyword(s):  
Surface Water ◽  
Vadose Zone ◽  
Transfer Functions ◽  
Root Zone ◽  
Integrated Modelling ◽  
Perched Water ◽  
Modelling Method ◽  
Murray River ◽  
Water Tables

Quantifying the magnitude and timing of groundwater returns to streams from irrigation is important for the management of natural resources in irrigation districts where the quantity or quality of surface water can be affected. Deep vadose zones and perched water tables can complicate the modelling of these fluxes, and model outputs may be biased if these factors are misrepresented or ignored. This study was undertaken in the Murray Basin in southern Australia to develop and test an integrated modelling method that links irrigation activity to surface water impacts by accounting for all key hydrological processes, including perching and vadose zone transmission. The method incorporates an agronomic water balance to simulate root zone processes, semi-analytical transfer functions to simulate the deeper vadose zone, and an existing numerical groundwater model to simulate irrigation returns to the Murray River and inform the management of river salinity. The integrated modelling can be calibrated by various means, depending on context, and has been shown to be beneficial for management purposes without introducing an unnecessary level of complexity to traditional modelling workflows. Its applicability to other irrigation settings is discussed.

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