Your search found 4 records
1 Wösten, J. H. M.; Van Den Berg, J.; Van Eijk, P.; Gevers, G. J. M.; Giesen, W. B. J. T.; Hooijer, A.; Idris, A.; Leenman, P. H.; Rais, D. S.; Siderius, C.; Silvius, M. J.; Suryadiputra, N.; Wibisono, I. T. 2006. Interrelationships between hydrology and ecology in fire degraded tropical peat swamp forests. International Journal of Water Resources Development, 22(1):157-174.
Peatlands ; Swamps ; Watersheds ; Groundwater ; Biodiversity ; Land use ; Models ; Hydrology / Indonesia
(Location: IWMI-HQ Call no: PER Record No: H038388)
2 Moors, E. J.; Groot, A.; van Scheltinga, C. T.; Siderius, C.; Stoffel, M; Huggel, C.; Wiltshire, A.; Mathison, C.; Ridley, J.; Jacob, D.; Kumar, P.; Bhadwal, S.; Gosain, A.; Collins, D. N. 2011. Adaptation to changing water resources in the Ganges basin northern India. Environmental Science and Policy, 14:758-769.
Water resources ; Water demand ; Climate change ; Adaptation ; Water availability ; River basins ; Glaciers ; Runoff ; Lowland / India / Ganges basin
(Location: IWMI HQ Call no: e-copy only Record No: H045015)
(1.02 MB)
An ensemble of regional climate model (RCM) runs from the EU HighNoon project are used to project future air temperatures and precipitation on a 25 km grid for the Ganges basin in northern India, with a view to assessing impact of climate change on water resources and determining what multi-sector adaptation measures and policies might be adopted at different spatial scales. The RCM results suggest an increase in mean annual temperature, averaged over the Ganges basin, in the range 1–4 8C over the period from 2000 to 2050, using the SRES A1B forcing scenario. Projections of precipitation indicate that natural variability dominates the climate change signal and there is considerable uncertainty concerning change in regional annual mean precipitation by 2050. The RCMs do suggest an increase in annual mean precipitation in this region to 2050, but lack significant trend. Glaciers in headwater tributary basins of the Ganges appear to be continuing to decline but it is not clear whether meltwater runoff continues to increase. The predicted changes in precipitation and temperature will probably not lead to significant increase in water availability to 2050, but the timing of runoff from snowmelt will likely occur earlier in spring and summer. Water availability is subject to decadal variability, with much uncertainty in the contribution from climate change. Although global social-economic scenarios show trends to urbanization, locally these trends are less evident and in some districts rural population is increasing. Falling groundwater levels in the Ganges plain may prevent expansion of irrigated areas for food supply.
3 Siderius, C.; Boonstra, H.; Munaswamy, V.; Ramana, C.; Kabat, P.; van Ierland, E.; Hellegers, P. 2015. Climate-smart tank irrigation: a multi-year analysis of improved conjunctive water use under high rainfall variability. Agricultural Water Management, 148:52-62. [doi: https://doi.org/10.1016/j.agwat.2014.09.009]
Irrigation systems ; Tank irrigation ; Rehabilitation ; Climate change ; Water use ; Conjunctive use ; Rain ; Groundwater ; Water productivity ; Performance evaluation ; Intensive farming ; Crop yield ; Farm income ; Farmers ; Case studies / India / Andhra Pradesh / Musilipedu Tank
(Location: IWMI HQ Call no: e-copy only Record No: H047426)
(2.42 MB)
Although water harvesting is receiving renewed attention as a strategy to cope with increasing seasonal and inter-annual rainfall variability, many centuries-old local water-harvesting reservoirs (tanks) in India are rapidly deteriorating. Easy access to groundwater is seen as one of the major threats to their maintenance and functioning. Potentially, however, conjunctive use of water from rain, tanks and groundwater reserves, supported by proper monitoring, could improve the resilience and productivity of traditional tank irrigation systems. To date, few quantitative multi-annual analyses of such climate-smart systems have been published. To redress this, we assess the sustainability of a rehabilitated tank irrigation system, by monitoring all inputs and outputs over a period of six years (12 cropping seasons). Our results show that during the period considered, improved conjunctive use resulted in a more stable cropping intensity, increased economic water productivity and higher net agricultural income. Groundwater tables were not negatively affected. We argue that improved conjunctive use can considerably reduce the vulnerability of tank irrigation to rainfall variability and thus is a valuable strategy in light of future climate change.
4 Lutz, A. F.; Immerzeel, W. W.; Siderius, C.; Wijngaard, R. R.; Nepal, Santosh; Shrestha, A. B.; Wester, P.; Biemans, H. 2022. South Asian agriculture increasingly dependent on meltwater and groundwater. Nature Climate Change, 12(6):566-573. [doi: https://doi.org/10.1038/s41558-022-01355-z]
Meltwater ; Groundwater ; Agriculture ; Irrigated farming ; Climate change ; Forecasting ; Hydrological modelling ; Socioeconomic aspects ; Water availability ; Water supply ; Water demand ; Irrigation water ; Water extraction ; Rain ; Runoff ; Glaciers ; River basins ; Monsoon climate ; Crops / South Asia / Indus River Basin / Ganges River Basin / Brahmaputra River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051247)
(4.42 MB)
Irrigated agriculture in South Asia depends on meltwater, monsoon rains and groundwater. Climate change alters the hydrology and causes shifts in the timing, composition and magnitude of these sources of water supply. Simultaneously, socio-economic growth increases water demand. Here we use a high-resolution cryosphere–hydrology–crop model forced with an ensemble of climate and socio-economic projections to assess how the sources of irrigation water supply may shift during the twenty-first century. We find increases in the importance of meltwater and groundwater for irrigated agriculture. An earlier melt peak increases meltwater withdrawal at the onset of the cropping season in May and June in the Indus, whereas increasing peak irrigation water demand during July and August aggravates non-renewable groundwater pumping in the Indus and Ganges despite runoff increases. Increasing inter-annual variability in rainfall runoff increases the need for meltwater and groundwater to complement rainfall runoff during future dry years.
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