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Discharge measurements made in Bayou Heron and Bayou Middle, Grand Bay, Mississippi in January 2017


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Nowacki, D.J., Ganju, N.K., Suttles, S.E., Borden, J., and Nichols, A., 2018, Discharge measurements made in Bayou Heron and Bayou Middle, Grand Bay, Mississippi in January 2017: U.S. Geological Survey data release,


Grand Bay, a 30-square-kilometer embayment of the Gulf of Mexico bordered by 20 square kilometers of salt marsh, is experiencing rapid lateral shoreline erosion at up to 5 meters per year. Determining whether the eroded sediment is exported to the deep ocean or imported via tidal channels and deposited on the marsh platform is critical to understanding the long-term response of the marsh to wave attack and sea-level rise. Quantifying water-column sediment flux helps to characterize the role of tidal channels in this process, and water discharge is a key component of sediment flux. To that end, discharge was measured repeatedly over consecutive diurnal tidal cycles in the tidal channels of Bayou Heron and Bayou Middle, within Grand [...]


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The discharge measurements were used as part of a process to create an index-velocity relationship between flow velocity measured at a single location within the channel and the channel-average velocity. This relationship enables the computation of a time-series of total channel discharge from long-term deployments of oceanographic instrumentation measuring at a single location within the channel.

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DOI doi:10.5066/P98NHB82

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