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An enhanced adaptive management approach for remediation of legacy mercury in the South River.

Foran CM, Baker KM, Grosso NR, Linkov I - PLoS ONE (2015)

Bottom Line: We describe the application of this enhanced adaptive management (EAM) framework to compare remedial alternatives for mercury in the South River, based on an understanding of the loading and behavior of mercury in the South River near Waynesboro, VA.The outcomes show that the ranking of remedial alternatives is influenced by uncertainty in the mercury loading model, by the relative importance placed on different criteria, and by cost estimates.The process itself demonstrates that a decision model can link project performance criteria, decision-maker preferences, environmental models, and short- and long-term monitoring information with management choices to help shape a remediation approach that provides useful information for adaptive, incremental implementation.

View Article: PubMed Central - PubMed

Affiliation: United States Army Engineer Research and Development Center Duty Station: U.S. Army Corps of Engineers New England District, Concord, MA 01742, United States of America.

ABSTRACT
Uncertainties about future conditions and the effects of chosen actions, as well as increasing resource scarcity, have been driving forces in the utilization of adaptive management strategies. However, many applications of adaptive management have been criticized for a number of shortcomings, including a limited ability to learn from actions and a lack of consideration of stakeholder objectives. To address these criticisms, we supplement existing adaptive management approaches with a decision-analytical approach that first informs the initial selection of management alternatives and then allows for periodic re-evaluation or phased implementation of management alternatives based on monitoring information and incorporation of stakeholder values. We describe the application of this enhanced adaptive management (EAM) framework to compare remedial alternatives for mercury in the South River, based on an understanding of the loading and behavior of mercury in the South River near Waynesboro, VA. The outcomes show that the ranking of remedial alternatives is influenced by uncertainty in the mercury loading model, by the relative importance placed on different criteria, and by cost estimates. The process itself demonstrates that a decision model can link project performance criteria, decision-maker preferences, environmental models, and short- and long-term monitoring information with management choices to help shape a remediation approach that provides useful information for adaptive, incremental implementation.

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Remedial alternatives considered in the case study.The alternatives are different combinations of measures including vegetative bank stabilization, monitored natural recovery (MNR) in the reaches closest to the outfall, and outflow source control.
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pone.0117140.g002: Remedial alternatives considered in the case study.The alternatives are different combinations of measures including vegetative bank stabilization, monitored natural recovery (MNR) in the reaches closest to the outfall, and outflow source control.

Mentions: A set of remedial alternatives were developed for the case study (Fig. 2). The alternatives are different combinations of measures including vegetative bank stabilization, monitored natural recovery (MNR) in the reaches closest to the outfall, and outflow source control. The performance of each alternative was calculated based on each of the 6 metrics comprising the 4 evaluation criteria. The effectiveness criterion reflecting the anticipated average concentration of MeHg in smallmouth bass 20 years post alternative implementation was calculated using a mass balance model and the empirical relationship between water column total Hg (THg) concentration and smallmouth bass tissue MeHg concentration reported in Brent and Kain [21]. The performance of each alternative on the metrics comprising the implementability and ecological effects criteria were specified on a high-medium-low (1, 0.5, 0) scale based on expert judgment and are reported in Table 1. A range of probable costs for each alternative was also specified based on the mean, minimum, and maximum probable cost of implementing and maintaining each measure. Costs are included in the model only using current value. These initial parameters would be expected to be updated utilizing study and monitoring data collected following implementation. Monitoring and implementation outcomes are used to revise and recalculate the model, reducing uncertainty and changing the relative performance of different alternatives.


An enhanced adaptive management approach for remediation of legacy mercury in the South River.

Foran CM, Baker KM, Grosso NR, Linkov I - PLoS ONE (2015)

Remedial alternatives considered in the case study.The alternatives are different combinations of measures including vegetative bank stabilization, monitored natural recovery (MNR) in the reaches closest to the outfall, and outflow source control.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4321986&req=5

pone.0117140.g002: Remedial alternatives considered in the case study.The alternatives are different combinations of measures including vegetative bank stabilization, monitored natural recovery (MNR) in the reaches closest to the outfall, and outflow source control.
Mentions: A set of remedial alternatives were developed for the case study (Fig. 2). The alternatives are different combinations of measures including vegetative bank stabilization, monitored natural recovery (MNR) in the reaches closest to the outfall, and outflow source control. The performance of each alternative was calculated based on each of the 6 metrics comprising the 4 evaluation criteria. The effectiveness criterion reflecting the anticipated average concentration of MeHg in smallmouth bass 20 years post alternative implementation was calculated using a mass balance model and the empirical relationship between water column total Hg (THg) concentration and smallmouth bass tissue MeHg concentration reported in Brent and Kain [21]. The performance of each alternative on the metrics comprising the implementability and ecological effects criteria were specified on a high-medium-low (1, 0.5, 0) scale based on expert judgment and are reported in Table 1. A range of probable costs for each alternative was also specified based on the mean, minimum, and maximum probable cost of implementing and maintaining each measure. Costs are included in the model only using current value. These initial parameters would be expected to be updated utilizing study and monitoring data collected following implementation. Monitoring and implementation outcomes are used to revise and recalculate the model, reducing uncertainty and changing the relative performance of different alternatives.

Bottom Line: We describe the application of this enhanced adaptive management (EAM) framework to compare remedial alternatives for mercury in the South River, based on an understanding of the loading and behavior of mercury in the South River near Waynesboro, VA.The outcomes show that the ranking of remedial alternatives is influenced by uncertainty in the mercury loading model, by the relative importance placed on different criteria, and by cost estimates.The process itself demonstrates that a decision model can link project performance criteria, decision-maker preferences, environmental models, and short- and long-term monitoring information with management choices to help shape a remediation approach that provides useful information for adaptive, incremental implementation.

View Article: PubMed Central - PubMed

Affiliation: United States Army Engineer Research and Development Center Duty Station: U.S. Army Corps of Engineers New England District, Concord, MA 01742, United States of America.

ABSTRACT
Uncertainties about future conditions and the effects of chosen actions, as well as increasing resource scarcity, have been driving forces in the utilization of adaptive management strategies. However, many applications of adaptive management have been criticized for a number of shortcomings, including a limited ability to learn from actions and a lack of consideration of stakeholder objectives. To address these criticisms, we supplement existing adaptive management approaches with a decision-analytical approach that first informs the initial selection of management alternatives and then allows for periodic re-evaluation or phased implementation of management alternatives based on monitoring information and incorporation of stakeholder values. We describe the application of this enhanced adaptive management (EAM) framework to compare remedial alternatives for mercury in the South River, based on an understanding of the loading and behavior of mercury in the South River near Waynesboro, VA. The outcomes show that the ranking of remedial alternatives is influenced by uncertainty in the mercury loading model, by the relative importance placed on different criteria, and by cost estimates. The process itself demonstrates that a decision model can link project performance criteria, decision-maker preferences, environmental models, and short- and long-term monitoring information with management choices to help shape a remediation approach that provides useful information for adaptive, incremental implementation.

Show MeSH
Related in: MedlinePlus