Your search found 4 records
1 Ryan, J.; Vlek, P.; Paroda, R. (Eds.) 2004. Agriculture in Central Asia: Research for development. Aleppo, Syria: ICARDA. xvii, 361p.
Crops ; Diversification ; Crop production ; Climate ; Mapping ; Water management ; Constraints ; Water use efficiency ; Groundwater ; Salinity ; Drainage ; Water reuse ; Ecosystems ; Tillage ; Maize ; Livestock ; Agricultural research ; International cooperation / Central Asia / Uzbekistan / Tajikistan / Amu-Darya River
(Location: IWMI-HQ Call no: 630 G570 RYA Record No: H036006)
Proceedings of a Symposium held at the American Society of Agronomy Annual Meetings at Indianapolis, Indiana, USA, 10-14 November 2002
2 Bharati, Luna; Rodgers, C.; Shumilov, S.; Plotnikova, M.; Vlek, P.. 2007. Integrated modelling of conjunctive use of surface and groundwater resources in a small-scale irrigation system in the Volta Basin, Africa. In Reducing the vulnerability of societies to water related risks at the basin scale: proceedings of the 3rd International Symposium on Integrated Water Resources Management, held at the Ruhr-University Bochum, Germany, 26-28 September 2006. Wallingford, UK: International Association of Hydrological Sciences (IAHS) pp.167-172.
Surface water ; Groundwater ; Conjunctive use ; Reservoirs ; Irrigation systems ; Runoff ; Simulation models ; Water balance ; Water table ; River basins ; Pumping ; Costs / Africa / Ghana / Volta Basin / Atankwidi Catchment / Kandiga Village
(Location: IWMI HQ Call no: e-copy only Record No: H040851)
The Volta Basin covers 400 000 km of the West-African Savanna. Agriculture is the dominant ecnomic activity. Given the extremely unreliable rainfall, irrigation development is seen as an obvious strategy to increase agricultural production. Irrigation development is mainly linked to the construction of small and medium sized reservoirs. The potential use of groundwater for irrigation is a very important issue. In this study, we present an evaluation of the conjunctive use of surface and groundwater in a representative small reservoir-irrigation system. The physical processes are modelled with WaSiM-ETH. The physical boundary conditions needed for the optimization model are then passed on to the optimization model written in GAMS, which then simulates the capture and utilization of runoff in small reservoirs. Water can be withdrawn for irrigation, or stored. Irrigation water can also be pumped from the underlying aquifer, and pumping costs are modelled as proportional to the distance to the water table.
3 Bharati, Luna; Rodgers, C.; Erdenberger, T.; Plotnikova, M.; Shumilov, S.; Vlek, P.; Martin, N. 2008. Integration of economic and hydrologic models: exploring conjunctive irrigation water use strategies in the Volta Basin. Agricultural Water Management, 95(8): 925-936.
Decision support tools ; Simulation models ; Optimization ; Conjunctive use ; Surface water ; Groundwater ; River basins ; Catchment areas ; Reservoirs ; Water storage / West Africa / Ghana / Burkina Faso / Togo / Mali / Ivory Coast / Volta Basin / Atankwidi catchment / Kandiga Reservoir
(Location: IWMI HQ Call no: IWMI 631.7.1 G100 BHA Record No: H041379)
We describe the development, calibration and preliminary application of a dynamically coupled economic–hydrologic simulation–optimization model ensemble for evaluating the conjunctive use of surface and groundwater in small reservoir-based irrigation systems characteristic of the Volta Basin, Africa. We focus on a representative small reservoir irrigation system located in the Antakwidi catchment in Ghana. The model ensemble consists of the physical hydrology model WaSiM-ETH and an economic optimization model written in GAMS. Results include optimal water storage and allocation regimes for irrigated production, given conjunctive surface water and groundwater systems. The goal of our research, conducted within the GLOWA Volta project, is to develop a decision support system for improving the management of land and water resources in the face of potential environmental change in the Volta Basin.
4 Stevenson, J.; Vanlauwe, B.; Macours, K.; Johnson, N.; Krishnan, L.; Place, F.; Spielman, D.; Hughes, K.; Vlek, P.. 2019. Farmer adoption of plot- and farm-level natural resource management practices: between rhetoric and reality. Global Food Security, 20:101-104. [doi: https://doi.org/10.1016/j.gfs.2019.01.003]
Natural resources management ; Farmer participation ; Agricultural practices ; On-farm research ; Fields ; Smallholders ; Agricultural research ; Sustainability ; CGIAR ; Scientists
(Location: IWMI HQ Call no: e-copy only Record No: H049104)
(0.18 MB)
There is a significant gap between the rhetoric of claims about adoption of farm-level natural resource management practices and the reality. New empirical evidence of low adoption from several developing countries suggests that on-farm natural resource management practices face significant constraints to adoption, and that they deliver heterogeneous private and public benefits. Five recommendations are given to the research community related to: targeting; scaling-up; the proper role of research; trajectories of diffusion; and measurement of environmental impacts.
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