Your search found 5 records
1 Acharya, S.. 1989. Agricultural wages in India: A disaggregated analysis. Indian Journal of Agricultural Economics, 44(2):121-139.
(Location: IWMI-HQ Call no: PER Record No: H05695)
2 Massuel, S.; George, B. A.; Venot, J.-P.; Bharati, Luna; Acharya, S.. 2013. Improving assessment of groundwater-resource sustainability with deterministic modelling: a case study of the semi-arid Musi sub-basin, South India. Hydrogeology Journal, 21:1567-1580.
Groundwater management ; Water resources ; Water supply ; Sustainability ; Arid lands ; River basins ; Aquifers ; Models ; Case studies / South India / Musi River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H046196)
(1.08 MB)
Since the 1990s, Indian farmers, supported by the government, have partially shifted from surface-water to groundwater irrigation in response to the uncertainty in surface-water availability. Water-management authorities only slowly began to consider sustainable use of groundwater resources as a prime concern. Now, a reliable integration of groundwater resources for water-allocation planning is needed to prevent aquifer overexploitation. Within the 11,000-km2 Musi River sub-basin (South India), human interventions have dramatically impacted the hard-rock aquifers, with a water-table drop of 0.18m/a over the period 1989–2004. A fully distributed numerical groundwater model was successfully implemented at catchment scale. The model allowed two distinct conceptualizations of groundwater availability to be quantified: one that was linked to easily quantified fluxes, and one that was more expressive of long-term sustainability by taking account of all sources and sinks. Simulations showed that the latter implied 13% less available groundwater for exploitation than did the former. In turn, this has major implications for the existing waterallocation modelling framework used to guide decision makers and water-resources managers worldwide.
3 Acharya, S.; George, B.; Aye, L.; Nair, S.; Nawarathna, B.; Malano, H. 2015. Life cycle energy and greenhouse gas emission analysis of groundwater-based irrigation systems. Irrigation and Drainage, 64(3):408-418. [doi: https://doi.org/10.1002/ird.1896]
Greenhouse gases ; Emission ; Energy consumption ; Life cycle analysis ; Irrigation systems ; Groundwater irrigation ; Pumping ; Water distribution ; Flood irrigation ; Drip irrigation ; Centre pivot irrigation ; Tube wells ; Drilling equipment ; Models / India / Australia
(Location: IWMI HQ Call no: e-copy only Record No: H047438)
(0.45 MB)
The reliance on groundwater for irrigation is increasing in Australia and India, which is causing concerns to policy makers about energy consumption and greenhouse gas (GHG) emissions. Therefore, it is important to quantify the GHG emissions of all components of the groundwater-based irrigation systems, over the entire life cycle to develop more environmentally friendly groundwater management strategies. This study identified and analysed energy use and GHG emissions associated with different components in the supply chain of groundwater-based irrigation systems. An existing GHG emissions and energy-accounting framework was adapted to enhance its capabilities by considering drilling techniques, water distribution and irrigation application methods. The results of this study highlighted that embodied and direct GHG emissions from drilling tube wells were higher in the Musi catchment, India, compared to South Australia. The study also highlighted that GHG emissions associated with water conveyance were higher for concrete and plastic-lined channels than unlined channels. Drip irrigation systems in both countries were found to have more GHG emissions than gravity-fed systems. Centre pivot systems were found to be emitting more than the drip systems in South Australia. We conclude that different components of the system have an impact on total GHG emissions and energy consumption for both countries. Any change in the most commonly used methods of drilling bore wells, water distribution in channels, and the irrigation methods, will have distinct impacts on energy consumption rates and GHG emissions. The developed conceptual framework provided a systematic complete analysis of the energy-consuming and GHG-emitting components associated with groundwater-based irrigation systems. Policy makers and decision makers may use the developed framework to compare different system components to develop strategies that have minimal impact on the environment.
4 Acharya, S.; Mylavarapu, R. S. 2015. Modeling shallow water table dynamics under subsurface irrigation and drainage. Agricultural Water Management, 149:166-174. [doi: https://doi.org/10.1016/j.agwat.2014.11.006]
Groundwater ; Water table ; Water management ; Models ; Subsurface irrigation ; Drainage systems ; Water supply ; Flow discharge ; Soil moisture ; Plant growth ; Evapotranspiration ; Rain / USA / Florida
(Location: IWMI HQ Call no: e-copy only Record No: H047498)
(2.54 MB)
We develop conceptual and numerical models of water table dynamics under a subsurface irrigation and drainage system. The numerical model is implemented with distinct drainable and fillable porosity parameters that are estimated by accounting for the unsaturated zone fluxes to and from the shallow water table. The model was applied to two field sites under subsurface irrigation and drainage system in northeast Florida to simulate water table dynamics during potato growing seasons in 2010 and 2011. Simulated water table elevations showed a close agreement with the observed water table dynamics in the fields during both growing seasons. Furrows that act as shallow drains in the field facilitated rapid drawdown of the water table after rainfall events, while the outer, deeper ditches provided little drainage of water from the root-zone. Intermittent irrigation regimes, although could substantially reduce surface runoff from the fields, resulted in relatively deeper water tables during the growing season, suggesting a potential trade-off between water deliveries and root-zone soil moisture availability.
5 Urfels, A.; Shakya, S. M.; Maharjan, S.; Lohanee, B. D.; Pandey, V.; Khadka, Manohara; Adhikari, S.; Neupane, A.; Karki, S.; Acharya, S.; Foster, T.; Krupnik, T. 2021. Framework for co-development of an open hydrological data system to enhance climate resilience in climate vulnerable countries: experience from a digital groundwater monitoring pilot in Nepal. [Abstract only]. Paper presented at the European Geosciences Union (EGU) General Assembly 2021, Online, 19-30 April 2021. 2p. [doi: https://doi.org/10.5194/egusphere-egu21-15104]
Groundwater ; Monitoring ; Hydrological data ; Frameworks ; Climate change ; Resilience ; Vulnerability ; Stakeholders / Nepal
(Location: IWMI HQ Call no: e-copy only Record No: H050377)
https://meetingorganizer.copernicus.org/EGU21/EGU21-15104.html?pdf
https://vlibrary.iwmi.org/pdf/H050377.pdf
https://vlibrary.iwmi.org/pdf/H050377.pdf
(0.27 MB) (278 KB)
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