Bigger tides, less flooding: Effects of dredging on barotropic dynamics in a highly modified estuary.
Ralston, David K.
Geyer, W. Rockwell
Al‐Zubaidi, Hussein A. M.
Sommerfield, Christopher K.
MetadataShow full item record
Since the late nineteenth century, channel depths have more than doubled in parts of New York Harbor and the tidal Hudson River, wetlands have been reclaimed and navigational channels widened, and river flow has been regulated. To quantify the effects of these modifications, observations and numerical simulations using historical and modern bathymetry are used to analyze changes in the barotropic dynamics. Model results and water level records for Albany (1868 to present) and New York Harbor (1844 to present) recovered from archives show that the tidal amplitude has more than doubled near the head of tides, whereas increases in the lower estuary have been slight (<10%). Channel deepening has reduced the effective drag in the upper tidal river, shifting the system from hyposynchronous (tide decaying landward) to hypersynchronous (tide amplifying). Similarly, modeling shows that coastal storm effects propagate farther landward, with a 20% increase in amplitude for a major event. In contrast, the decrease in friction with channel deepening has lowered the tidally averaged water level during discharge events, more than compensating for increased surge amplitude. Combined with river regulation that reduced peak discharges, the overall risk of extreme water levels in the upper tidal river decreased after channel construction, reducing the water level for the 10‐year recurrence interval event by almost 3 m. Mean water level decreased sharply with channel modifications around 1930, and subsequent decadal variability has depended both on river discharge and sea level rise. Channel construction has only slightly altered tidal and storm surge amplitudes in the lower estuary.
Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 124 (2019): 196-211, doi:10.1029/2018JC014313.
Suggested CitationRalston, D. K., Talke, S., Geyer, W. R., Al-Zubaidi, H. A. M., & Sommerfield, C. K. (2019). Bigger tides, less flooding: Effects of dredging on barotropic dynamics in a highly modified estuary. Journal of Geophysical Research: Oceans, 124, 196-211
Showing items related by title, author, creator and subject.
Impact of climate change on New York City’s coastal flood hazard : increasing flood heights from the preindustrial to 2300 CE Garner, Andra J.; Mann, Michael E.; Emanuel, Kerry A.; Kopp, Robert E.; Lin, Ning; Alley, Richard B.; Horton, Benjamin P.; DeConto, Robert M.; Donnelly, Jeffrey P.; Pollard, David (2017-09)The flood hazard in New York City depends on both storm surges and rising sea levels. We combine modeled storm surges with probabilistic sea-level rise projections to assess future coastal inundation in New York City from ...
SRA accessions and collection information for 16S-V4 rRNA amplicon data from invertebrates sampled at Flower Garden Banks National Marine Sanctuary, Gulf of Mexico following Tax Day Flooding (2016), Hurricane Harvey (2017), and a no flooding year (2018) Correa, Adrienne Simoes; Santiago-Vazquez, Lory (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: email@example.com, 2020-07-24)To document the effects of storm-driven freshwater runoff on sponge-associated microbiomes, we leveraged the heavy rainfall associated with Tax Day Flooding (July 2016) and Hurricane Harvey (August 2017) to characterize ...
Williams, William J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-02)During January-March, Scotian Shelf water has been observed to flow episodically from the southwestern Scotian Shelf directly across the Northeast Channel to Georges Bank. The possible factors that allow Scotian Shelf ...