Balancing ecosystem services with energy and food security – Assessing trade-offs from reservoir operation and irrigation investments in Kenya's Tana Basin
Open Access
- 28 August 2014
- journal article
- Published by Copernicus GmbH in Hydrology and Earth System Sciences
- Vol. 18 (8), 3259-3277
- https://doi.org/10.5194/hess-18-3259-2014
Abstract
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.Keywords
This publication has 49 references indexed in Scilit:
- A computationally efficient open-source water resource system simulator – Application to London and the Thames BasinEnvironmental Modelling & Software, 2011
- Many‐objective groundwater monitoring network design using bias‐aware ensemble Kalman filtering, evolutionary optimization, and visual analyticsWater Resources Research, 2011
- Expanding the solution set: Organizational economics and agri-environmental policyEcological Economics, 2009
- Hydro-economic models: Concepts, design, applications, and future prospectsJournal of Hydrology, 2009
- Development of representative indicators of hydrologic alterationJournal of Hydrology, 2009
- Integrating “livelihoods” into integrated water resources management: taking the integration paradigm to its logical next step for developing countriesRegional Environmental Change, 2005
- Environmental Economics and the Conflation of Value and BenefitEnvironmental Science & Technology, 2000
- Phenology of Flowering and Fruiting of an East African Riverine Forest EcosystemBiotropica, 1992
- The Influence of Flooding Regimes on Forest Distribution and Composition in the Tana River Floodplain, KenyaJournal of Applied Ecology, 1990
- River flow forecasting through conceptual models part I — A discussion of principlesJournal of Hydrology, 1970