Repeated multibeam echosounder hydrographic surveys of 15 selected bridge crossings along the Missouri River from Niobrara to Rulo, Nebraska, during the flood of 2011

Dietsch, Benjamin J.; Densmore, Brenda K.; Strauch, Kellan R.

doi:10.3133/sir20145062

Cited by 5 publications

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“…[36] and reference therein) and bridge piers in rivers (e.g. [37]; [38]). Recent applications have shown the potential of MBES to map seafloor features and habitats at very high resolution (e.g.…”

Section: Introductionmentioning

confidence: 99%

Tidal inlet seafloor changes induced by recently built hard structures

et al. 2019

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Tidal inlets are extremely dynamic environments that are often strongly modified by anthropogenic intervention. In this study, we describe the rapid evolution of a highly human-impacted tidal inlet, studied through repeated high-resolution multibeam surveys and geomorphometric analysis. We document the rapid change induced by new hard coastal structures built to protect the historical city of Venice (Italy). A new breakwater erected between 2011 and 2013 induced the formation of large scour holes with the consequent erosion of about 170 · 103 ± 15.6% m3 of sediment until 2016. The construction of a new island in the middle of the inlet and the restriction of the inlet channel caused a general change of the inlet sedimentary regime from depositional to erosive with a net sediment loss of about 612 · 103 ± 42.7% m3, a reduction of the dune field area by more than 50% in about five years, and a coarsening in the sediment distribution. Our results give new insight on the tidal inlet resilience to changes, distinguishing two different phases in its recent evolution: (i) a very rapid response (from 2011 to 2013) of the seafloor morphology with scour-hole erosion at the new breakwater tips at a rate of about 45⋅103 m3/year and the disappearing of dune fields at a rate of 104⋅103 m2/year; and (ii) a general slowdown of the erosive processes from 2013 to 2016. Nevertheless, the erosion continues at the breakwater, though at a reduced rate, possibly representing a threat to the hard structure. In view of global mean sea level rise and consequent proliferation of hard structures along the coast all over the world, the combined use of very high resolution multibeam surveys and repeatable geomorphometric analysis proposed in this study will be crucial for the monitoring and future management of coastal environments.

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Section: Introductionmentioning

confidence: 99%

Tidal inlet seafloor changes induced by recently built hard structures

et al. 2019

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Bathymetric and velocimetric surveys at highway bridges crossing the Missouri River near Kansas City, Missouri, August 2019, August 2020, and October 2020

Huizinga¹

2022

Scientific Investigations Report

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The author also wishes to gratefully acknowledge the assistance of several current and former colleagues at the U.S. Geological Survey Central Midwest Water Science Center for their assistance in collecting and processing the data for this project. Jarrett T. Ellis (former employee) was instrumental in collecting and initial processing of the data from the August 2019 surveys. Benjamin C. Rivers was instrumental in collecting the data from the two special surveys near the main channel piers of the Broadway and Randolph bridges in August and October 2020.

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Repeated multibeam echosounder hydrographic surveys of 15 selected bridge crossings along the Missouri River from Niobrara to Rulo, Nebraska, during the flood of 2011

Cited by 5 publications

References 1 publication

Tidal inlet seafloor changes induced by recently built hard structures

Tidal inlet seafloor changes induced by recently built hard structures

Bathymetric and velocimetric surveys at highway bridges crossing the Missouri River near Kansas City, Missouri, August 2019, August 2020, and October 2020

Bathymetric and velocimetric surveys at highway bridges crossing the Missouri and Mississippi Rivers near St. Louis, Missouri, August 3–10, 2020

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