2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 12:15 PM - 12:30 PM | INTERNAL FEEDBACKS BETWEEN VEGETATION AND COASTAL MARSH PERSISTENCE: WHAT HAPPENS WHEN THE SYSTEM IS ALTERED? | 251 DE
INTERNAL FEEDBACKS BETWEEN VEGETATION AND COASTAL MARSH PERSISTENCE: WHAT HAPPENS WHEN THE SYSTEM IS ALTERED?
The persistence of coastal marshes depends on their ability to keep elevation with sea level rise through vertical and lateral soil building. At small scales, coastal marsh distributions are controlled by internal feedbacks between vegetation, sediment deposition and erosion. Under future climate scenarios and anthropogenic alteration, these feedbacks between sediment deposition and marsh vegetation may change or become asynchronous, affecting marsh soil building. To determine peak vegetation trapping, I track changes to Normalized Difference Vegetation Index (NDVI), a measure of vegetation productivity, in coastal marshes across the Landsat record. In addition, I delineate mosquito ditches and canals along marsh islands to determine degree of anthropogenic alteration to hydrology regionally. Peak NDVI and duration of growing season suggest regional patterns of plant growth and productivity, with more northern marshes having later peaks and longer growing seasons. Anthropogenic modification also depicts regional differences in mosquito ditching and canals, with more northern latitudes across the U.S. having more ditches. These patterns in vegetation change and alteration of hydrology could influence the ecogeomorphic processes and intensity of internal feedbacks that maintain the marsh and determine future persistence in a time of anthropogenic pressure.
- Geomorphology
- Macrophyte
- Remote Sensing
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Presenters/Authors
Anna Braswell
(), Earth Lab, CIRES, University of Colorado Boulder, anna.braswell@colorado.edu;
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