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| Titel |
Balancing ecosystem services with energy and food security – Assessing trade-offs from reservoir operation and irrigation investments in Kenya's Tana Basin |
| VerfasserIn |
A. P. Hurford, J. J. Harou |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 8 ; Nr. 18, no. 8 (2014-08-28), S.3259-3277 |
| Datensatznummer |
250120450
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| Publikation (Nr.) |
 copernicus.org/hess-18-3259-2014.pdf |
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| Zusammenfassung |
| Competition for water between key economic sectors and the environment means
agreeing allocations is challenging. Managing releases from the three major
dams in Kenya's Tana River basin with its 4.4 million inhabitants, 567 MW of
installed hydropower capacity, 33 000 ha of irrigation and ecologically
important wetlands and forests is a pertinent example. This research seeks firstly to
identify and help decision-makers visualise reservoir management strategies
which result in the best possible (Pareto-optimal) allocation of benefits
between sectors. Secondly, it seeks to show how trade-offs between achievable
benefits shift with the implementation of proposed new rice, cotton and
biofuel irrigation projects. To approximate the Pareto-optimal trade-offs we
link a water resources management simulation model to a multi-criteria search algorithm.
The decisions or "levers" of the management problem are volume-dependent
release rules for the three major dams and extent of investment in new
irrigation schemes. These decisions are optimised for eight objectives covering the
provision of water supply and irrigation, energy generation and maintenance
of ecosystem services. Trade-off
plots allow decision-makers to assess multi-reservoir rule-sets and
irrigation investment options by visualising their impacts on different
beneficiaries. Results quantify how economic gains from proposed irrigation
schemes trade-off against the disturbance of ecosystems and local
livelihoods that depend on them. Full implementation of the proposed schemes
is shown to come at a high environmental and social cost. The clarity and
comprehensiveness of "best-case" trade-off analysis is a useful vantage
point from which to tackle the interdependence and complexity of
"water-energy-food nexus" resource security issues. |
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