Linking estimation methods to conceptual models of groundwater recharge

2013 ◽  
pp. 180-204
Author(s):  
Richard W. Healy ◽  
Bridget R. Scanlon
Keyword(s):  
Groundwater Recharge ◽  
Conceptual Models ◽  
Estimation Methods

scholarly journals Groundwater recharge processes in an Asian mega-delta: hydrometric evidence from Bangladesh

2020 ◽  
Vol 28 (8) ◽  
pp. 2917-2932
Author(s):  
Sara Nowreen ◽  
R. G. Taylor ◽  
M. Shamsudduha ◽  
M. Salehin ◽  
A. Zahid ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
Conceptual Models ◽  
Shallow Groundwater ◽  
Depositional Environments ◽  
Series Data ◽  
Groundwater Depletion ◽  
Bengal Basin ◽  
River Channels ◽  
Groundwater Levels ◽  
Pleistocene Aquifer

AbstractGroundwater is used intensively in Asian mega-deltas yet the processes by which groundwater is replenished in these deltaic systems remain inadequately understood. Drawing insight from hourly monitoring of groundwater levels and rainfall in two contrasting settings, comprising permeable surficial deposits of Holocene age and Plio-Pleistocene terrace deposits, together with longer-term, lower-frequency records of groundwater levels, river stage, and rainfall from the Bengal Basin, conceptual models of recharge processes in these two depositional environments are developed. The representivity of these conceptual models across the Bengal Basin in Bangladesh is explored by way of statistical cluster analysis of groundwater-level time series data. Observational records reveal that both diffuse and focused recharge processes occur in Holocene deposits, whereas recharge in Plio-Pleistocene deposits is dominated by indirect leakage from river channels where incision has enabled a direct hydraulic connection between river channels and the Plio-Pleistocene aquifer underlying surficial clays. Seasonal cycles of recharge and discharge including the onset of dry-season groundwater-fed irrigation are well characterised by compiled observational records. Groundwater depletion, evident from declining groundwater levels with a diminished seasonality, is pronounced in Plio-Pleistocene environments where direct recharge is inhibited by the surficial clays. In contrast, intensive shallow groundwater abstraction in Holocene environments can enhance direct and indirect recharge via a more permeable surface geology. The vital contributions of indirect recharge of shallow groundwater identified in both depositional settings in the Bengal Basin highlight the critical limitation of using models that exclude this process in the estimation of groundwater recharge in Asian mega-deltas.

scholarly journals New non-linear model of groundwater recharge: Inclusion of memory, heterogeneity and visco-elasticity

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Jescica Spannenberg ◽  
Abdon Atangana ◽  
P.D. Vermeulen
Keyword(s):  
Groundwater Recharge ◽  
Memory Effect ◽  
Real World ◽  
Numerical Solutions ◽  
Estimation Methods ◽  
Adequate Model ◽  
Space And Time ◽  
Non Linear ◽  
Recharge Estimation ◽  
Geological Formations

AbstractFractional differentiation has adequate use for investigating real world scenarios related to geological formations associated with elasticity, heterogeneity, viscoelasticity, and the memory effect. Since groundwater systems exist in these geological formations, modelling groundwater recharge as a real world scenario is a challenging task to do because existing recharge estimation methods are governed by linear equations which make use of constant field parameters. This is inadequate because in reality these parameters are a function of both space and time. This study therefore concentrates on modifying the recharge equation governing the EARTH model, by application of the Eton approach. Accordingly, this paper presents a modified equation which is non-linear, and accounts for parameters in a way that it is a function of both space and time. To be more specific, herein, recharge and drainage resistance which are parameters within the equation, became a function of both space and time. Additionally, the study entailed solving the non-linear equation using an iterative method as well as numerical solutions by means of the Crank-Nicolson scheme. The numerical solutions were used alongside the Riemann-Liouville, Caputo-Fabrizio, and Atangana-Baleanu derivatives, so that account was taken for elasticity, heterogeneity, viscoelasticity, and the memory effect. In essence, this paper presents a more adequate model for recharge estimation.

scholarly journals Woody Plant Encroachment Impacts on Groundwater Recharge: A Review

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1466 ◽  
Author(s):  
Bharat Acharya ◽  
Gehendra Kharel ◽  
Chris Zou ◽  
Bradford Wilcox ◽  
Todd Halihan
Keyword(s):  
Water Resources ◽  
Groundwater Recharge ◽  
Woody Plant ◽  
Groundwater Resources ◽  
Plant Cover ◽  
Experimental Studies ◽  
Estimation Methods ◽  
Woody Plant Encroachment ◽  
Plant Removal ◽  
The Impact

Woody plant encroachment has profound impacts on the sustainable management of water resources in water-limited ecosystems. However, our understanding of the effects of this global phenomenon on groundwater recharge at local and regional scales is limited. Here, we reviewed studies related to (i) recharge estimation methods; (ii) mechanisms by which woody plants impact groundwater recharge; (iii) impacts of woody plant on recharge across different soil and geology; (iv) hydrological repercussions of woody plant removal; and (v) research gaps and needs for groundwater studies. We identified six different methods: water balance, water table, isotopes, chloride mass balance, electrical geophysical imaging, and modeling were used to study the impact of woody encroachment on groundwater. Woody plant encroachment could alter soil infiltration rates, soil water storage, transpiration, interception, and subsurface pathways to affect groundwater recharge. The impact is highly variable, with the extent and the magnitude varying across the soil, substrate, plant cover, and topographic locations. Our review revealed mixed effects of woody plant removal on groundwater recharge. Studies of litter interception, root water uptake, soil moisture dynamics, and deep percolation along with the progression of woody plant encroachment are still limited, warranting further experimental studies focusing on groundwater recharge. Overall, information about woody plant encroachment impacts on groundwater resources across a range of scales is essential for long-range planning of water resources.

Comparison of groundwater recharge estimation methods for the semi-arid Nyamandhlovu area, Zimbabwe

2009 ◽  
Vol 17 (6) ◽  
pp. 1427-1441 ◽  
Author(s):  
Tenant Sibanda ◽  
Johannes C. Nonner ◽  
Stefan Uhlenbrook
Keyword(s):  
Groundwater Recharge ◽  
Estimation Methods ◽  
Recharge Estimation ◽  
Semi Arid

scholarly journals The State-of-the-Art Estimation of Groundwater Recharge and Water Balance with a Special Emphasis on India: A Critical Review

2021 ◽  
Vol 14 (1) ◽  
pp. 340
Author(s):  
Pazhuparambil Jayarajan Sajil Kumar ◽  
Michael Schneider ◽  
Lakshmanan Elango
Keyword(s):  
Water Balance ◽  
Groundwater Recharge ◽  
State Of The Art ◽  
Climatic Conditions ◽  
Estimation Methods ◽  
Sustainable Water Management ◽  
Factors Affecting ◽  
Aquifer Systems ◽  
Recharge Estimation ◽  
Water Level Measurements

Groundwater recharge estimation is essential for sustainable water management and water supply schemes. In this paper, we review groundwater recharge estimation techniques and identify the appropriate methods by considering India’s hydrological and climatic conditions. Significant components of recharge, factors affecting groundwater recharge, aquifer systems of India, and historical groundwater recharge estimation practices are reviewed. Currently used recharge estimation methods are assessed based on case studies. The most popular estimation methods are studied and compared based on their application in various regions. It is observed that the accuracy of the recharge estimates is largely influenced by false assumptions, the possibility of erroneous measurements, a potential lack of reliable data, and a variety of problems associated with parameter estimation. The suitability of different methods for a region is found to depend on time and space considerations, the objective of the study, hydrogeological condition, and availability of data. In Indian conditions, it is suggested to use water table fluctuation and water balance methods for the recharge estimation, provided that accurate water level measurements are assured.

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