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Dataset
Time dependence of sediment accretion rates: Short- and long-term variability in an urban tidal marsh
04 Jul 2025
Abstract
Understanding the temporal variability of sediment accretion is crucial for assessing the resilience of tidal marshes to accelerated sea-level rise, particularly in urban settings where sediment delivery and hydrology are frequently altered. This study investigates sediment accretion across multiple timescales in Tinicum Marsh, an urban tidal wetland in Philadelphia. Using event-scale sediment traps, annual SET-MH measurements, and decadal radioisotope dating, the research reveals that sediment accretion rates vary significantly with timescale, aligning with the Sadler Effect. Event-based rates were much higher than annual and decadal rates, especially during storms, which delivered more mineral-rich sediments. Accretion was influenced by elevation and distance from tidal channels, and substantial shallow subsidence was observed. Although current accretion exceeds long-term sea-level rise, it only marginally keeps up with recent rates, highlighting the need for multi-scale analysis to assess marsh resilience.
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Details
- Title
- Time dependence of sediment accretion rates: Short- and long-term variability in an urban tidal marsh
- Creators
- Faith Echiejile - Drexel UniversityKirk Raper - New Jersey Department of Environmental ProtectionTracy Elsey-Quirk - Louisiana State UniversityDavid Velinsky - Drexel UniversityElizabeth Watson - Stony Brook University
- Publisher
- Dryad
- Grant note
- CZI:2011-PD.10 / Pennsylvania Coastal Zone Management 5040-ANSDU-NIAA-0063 / Pennsylvania Sea Grant (https://ror.org/033r52n02)
- Resource Type
- Dataset
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES); Environmental Biogeochemistry
- Other Identifier
- 991022064427904721