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Monday, February 6 • 4:00pm - 4:20pm
Technical Session. Floodplain Inundation Mapping Under Nonstationary Hydro-climatic Conditions on the Lower Missouri River to Support Multi-objective Management of Conservation Lands

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AUTHORS: Garth A. Lindner, University of Missouri; Edward A. Bulliner, US Geological Survey,Columbia Environmental Research Center ; Kristen Bouska, US Geological Survey, Upper Midwest Environmental Sciences Center; Craig Paukert, US Geological Survey, Missouri Cooperative Fish and Wildlife Research Unit; Robert B. Jacobson, US Geological Survey, Columbia Environmental Research Center

ABSTRACT: Conservation lands within large river floodplains are difficult to manage due to both the stochastic nature of the flow regime and extensive anthropogenic modifications throughout river systems. Lack of hydro-climatic stationarity compounds these management challenges, where changing climate, land use, and water use can alter the timing, duration and magnitude of hydrologic events. Our objectives were to 1) engage land managers to identify science needs and provide tools for long-term management of floodplain conservation lands. Through a series of surveys and workshops with floodplain conservation land managers along the upper and middle Mississippi River and the lower Missouri River we evaluated management priority, management intensity, and available scientific information for management objectives and conservation targets. Metrics of inundation, including depth and extent of inundation, frequency of inundation, and duration of inundation, were considered the most useful metrics for management of floodplain conservation lands. Therefore, we developed floodplain inundation metrics for the historic period of record and under a future climate change scenario for the lower 500-miles of the Missouri River. Using modeled historic water surface elevations from 1930-2012, we developed daily 30-m grids of floodplain depth and synthesized these into composite grids that represent the expected areas inundated under discrete flood return intervals and also the average days inundated per year, during the growing season, and during the bird migratory season. These same composite grids were also generated under a climate change scenario of projected runoff changes for the Missouri River. Our results summarizing the differences between these scenarios are applicable for both managers and researchers to evaluate inundation patterns and associations to identify the optimal locations for 1) establishing vegetation communities, 2) nursery and foraging habitats for fish and birds, and 3) floodplain functions such as nutrient cycling.

Monday February 6, 2017 4:00pm - 4:20pm
Grand Ballroom D

Attendees (4)