2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 2:15 PM - 2:30 PM | THE INFLUENCE OF DATASET SPECIFICATIONS AND ANALYSIS PROTOCOLS ON STREAM-WETLAND CONNECTIVITY IN A COASTAL PLAIN, MARYLAND WATERSHED | 301B
THE INFLUENCE OF DATASET SPECIFICATIONS AND ANALYSIS PROTOCOLS ON STREAM-WETLAND CONNECTIVITY IN A COASTAL PLAIN, MARYLAND WATERSHED
Distance-based metrics often serve as fundamental indicators when assessing stream-wetland hydrological connectivity, but whose quantification is subject to variation arising from dataset resolution, analysis methodology, and geographic scale. Evaluating this variation is needed to inform regulatory and management programs that assess wetland status based on distance. We investigate and show how differences in digital elevation model resolution, stream network definition and resolution, method of distance calculation, and watershed scale influence measured stream-wetland connectivity. Median distances between geographically isolated wetlands (GIWs) and downstream waters were 52% longer when measured via flowpaths as compared to Euclidean distance. Including riparian wetlands as part of the stream network resulted in decreased distances between GIWs and the stream network of 35-50% when comparing flowpath and Euclidean based distance approaches respectively. Altering elevation resolution did not result in differences in calculated flowpath length, but affected channel course. At a subwatershed scale, measured differences in stream density, wetland density and flowpath distance highlight the influence of landscape variability on connectivity. Disclaimer: The authors views expressed here do not necessarily reflect views or policies of USEPA or USFWS.
- C09 Wetland Ecology
- C34 Science and Policy
- C09 Wetland Ecology
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Presenters/Authors
Jason Todd
(), U.S. EPA, todd.jason@epa.gov;
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Laurie Alexander
(), U.S. Environmental Protection Agency, Office of Research and Development, alexander.laurie@epa.gov;
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Megan Lang
(), U.S. FWS, megan_lang@fws.gov;
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