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Decentralized Management Hinders Coastal Climate Adaptation: The Spatial-dynamics of Beach Nourishment

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Abstract

Climate change threatens to alter coastline erosion patterns in space and time and coastal communities adapt to these threats with decentralized shoreline stabilization measures. We model interactions between two neighboring towns, and explore welfare implications of spatial-dynamic feedbacks in the coastal zone. When communities are adjacent, the community with a wider beach loses sand to the community with a narrower beach through alongshore sediment transport. Spatial-dynamic feedbacks create incentives for both communities to nourish less, resulting in lower long-run beach width and lower property values in both communities, a result that parallels the classic prisoner’s dilemma. Intensifying erosion—consistent with accelerating sea level rise—increases the losses from failure to coordinate. Higher erosion also increases inequality in the distribution of benefits across communities under spatially coordinated management. This disincentive to coordinate suggests the need for higher-level government intervention to address a traditionally local problem. We show that a spatially targeted subsidy can achieve the first best outcome, and explore conditions under which a second-best uniform subsidy leads to small or large losses.

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Notes

  1. The long-run equilibrium under coordination is equal to the optimal steady-state width in the baseline case of a single representative community without spatial interaction.

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Acknowledgments

This research was funded by the NSF Biocomplexity Program (Grant #DEB0507987) and the NSF Environment, Society and the Economy (ESE) Grant (EAR 0592120).

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Correspondence to Sathya Gopalakrishnan.

Appendix

Appendix

See Appendix Tables 3 and Figs. 8, 9, 10 and 11.

Table 3 Nourishment cost function estimation
Fig. 8
figure 8

Comparison of optimal beach width under coordinated and decentralized management with economic heterogeneity. A, B Steady-state beach widths are not equal with economic heterogeneity. The difference in optimal steady state widths is lower under coordinated management, and both towns have wider beaches. C, D Coordination leads to more nourishment in both towns, but the poorer community (with wider initial beach in this case) significantly increases nourishment (relative to decentralized management) and subsidizes the richer town (with wider initial beach) by reducing diffusive losses

Fig. 9
figure 9

Sensitivity to price elasticity of beach width. Optimal beach width and nourishment rates increase as the value of beach width increases. Gains from coordination also increase as when property markets are more sensitive to changes in beach width

Fig. 10
figure 10

Sensitivity to nourishment costs

Fig. 11
figure 11

Comparison of optimal beach width under coordinated and decentralized management with alternative functional specifications. A, C Decentralized management leads to a flat steady-state beach width of 34 m. In the short term, the town with a narrower beach nourishes more but also benefits from its neighbor’s nourishment effort via alongshore sediment transport. B, D Coordinated management leads to a to a higher steady-state width of 41 m. Both towns increase nourishment and receive higher long-term benefits

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Gopalakrishnan, S., McNamara, D., Smith, M.D. et al. Decentralized Management Hinders Coastal Climate Adaptation: The Spatial-dynamics of Beach Nourishment. Environ Resource Econ 67, 761–787 (2017). https://doi.org/10.1007/s10640-016-0004-8

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