Direct policy search for robust multi-objective management of deeply uncertain socio-ecological tipping points. (June 2017)

• Record Type: Journal Article
• Authors: Quinn, Julianne D.; Reed, Patrick M.; Keller, Klaus
• Is Part Of: Environmental modelling & software. Volume 92(2017)
• Page Start: 125
• Page End: 141
• Publication Date: 2017-06
• Subjects: Socio-ecological management -- Multi-objective decision making -- Direct policy search -- Tipping points -- Robustness -- Deep uncertainty; Environmental monitoring -- Computer programs -- Periodicals; Ecology -- Computer simulation -- Periodicals; Digital computer simulation -- Periodicals; Computer software -- Periodicals; Environmental Monitoring -- Periodicals; Computer Simulation -- Periodicals; Environnement -- Surveillance -- Logiciels -- Périodiques; Écologie -- Simulation, Méthodes de -- Périodiques; Simulation par ordinateur -- Périodiques; Logiciels -- Périodiques; Computer software; Digital computer simulation; Ecology -- Computer simulation; Environmental monitoring -- Computer programs; Periodicals; Electronic journals; 363.70015118
• DOI: 10.1016/j.envsoft.2017.02.017
• Languages: English
• ISSNs: 1364-8152

Abstract

Abstract: Managing socio-ecological systems is a challenge wrought by competing societal objectives, deep uncertainties, and potentially irreversible tipping points. A classic, didactic example is the shallow lake problem in which a hypothetical town situated on a lake must develop pollution control strategies to maximize its economic benefits while minimizing the probability of the lake crossing a critical phosphorus (P) threshold, above which it irreversibly transitions into a eutrophic state. Here, we explore the use of direct policy search (DPS) to design robust pollution control rules for the town that account for deeply uncertain system characteristics and conflicting objectives. The closed loop control formulation of DPS improves the quality and robustness of key management tradeoffs, while dramatically reducing the computational complexity of solving the multi-objective pollution control problem relative to open loop control strategies. These insights suggest DPS is a promising tool for managing socio-ecological systems with deeply uncertain tipping points. Highlights: Managing socio-ecological systems with tipping points is a challenging multi-objective problem. Direct policy search (DPS) is a computationally efficient method for solving such problems. Compared to open loop control DPS finds policies that are more robust to deep uncertainties.