A multi-objective model for environmental investment decision making

Authors:
Andrew J. Higgins;Stefan Hajkowicz;Elisabeth Bui
Affiliations:
CSIRO Sustainable Ecosystems, Level 3, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia Qld 4067, Australia;CSIRO Sustainable Ecosystems, Level 3, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia Qld 4067, Australia;CSIRO Land and Water, GPO Box 1666, Canberra, ACT 2601, Australia
Venue:
Computers and Operations Research
Year:
2008

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Abstract

Investment in landscapes to achieve outcomes that have multiple environmental benefits has become a major priority in many countries. This gives rise to opportunities for mathematical programming methods to provide solutions on where investments could be made on the landscape, to maximise multiple environmental benefits. The problem was formulated as a multi-objective integer programming model, with objective functions representing biodiversity, water run-off and carbon sequestration. We applied a multi-objective Greedy Randomised Adaptive Search Procedure (GRASP) as an evolutionary programming method to find solutions along the Pareto front. This allows the decision maker to explore trade-off's between the objectives. A 142,000ha case study catchment in eastern Australia was used to test the methodology and assess the sensitivity of the different and often competing environmental benefits.