The influence of wind waves and tidal currents on sediment resuspension in Middle Chesapeake Bay

1985 ◽  
Vol 5 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Larry G. Ward
Keyword(s):  
Chesapeake Bay ◽  
Wind Waves ◽  
Sediment Resuspension ◽  
Tidal Currents

scholarly journals Application of geoinformation techniques to determine zones of sediment resuspension induced by wind waves in lakes (using two lakes from Northern Poland as examples)

2016 ◽  
Vol 16 (1) ◽  
pp. 3-14
Author(s):  
Elżbieta Bajkiewicz-Grabowska ◽  
Maciej Markowski ◽  
Krzysztof Lemańczyk
Keyword(s):  
Lake Water ◽  
Wind Waves ◽  
Sediment Resuspension ◽  
Simulation Method ◽  
Northern Poland ◽  
Gis Tools

Abstract Resuspension in lakes affects the quality of lake water. It is possible to model this process and visualize its outcomes using GIS tools. An assessment of the size of the zone of sediment resuspension was made for two lakes located in Northern Poland threatened by rapid eutrophication. For each of the lakes, four simulations using two methods for determining the effective wind length (F) (Model 1 and Model 2) and two methods for determining the wind wavelength (Lw) (Model A and Model B) were performed. The analysis, taking into account the morphometry of the studied lakes and anemometric conditions, indicated that the differentiator is the applied simulation method of calculating the wavelength caused by the wind. The analysis is theoretical in nature and the results need to be verified in the field..

scholarly journals Seabed Resuspension in the Chesapeake Bay: Implications for Biogeochemical Cycling and Hypoxia

2020 ◽  
Vol 44 (1) ◽  
pp. 103-122
Author(s):  
Julia M. Moriarty ◽  
Marjorie A. M. Friedrichs ◽  
Courtney K. Harris
Keyword(s):  
Organic Matter ◽  
Chesapeake Bay ◽  
Water Column ◽  
Primary Productivity ◽  
Environmental Changes ◽  
Light Attenuation ◽  
Sediment Resuspension ◽  
Nitrogen Dynamics ◽  
Biogeochemical Model ◽  
Order Of Magnitude

AbstractSediment processes, including resuspension and transport, affect water quality in estuaries by altering light attenuation, primary productivity, and organic matter remineralization, which then influence oxygen and nitrogen dynamics. The relative importance of these processes on oxygen and nitrogen dynamics varies in space and time due to multiple factors and is difficult to measure, however, motivating a modeling approach to quantify how sediment resuspension and transport affect estuarine biogeochemistry. Results from a coupled hydrodynamic–sediment transport–biogeochemical model of the Chesapeake Bay for the summers of 2002 and 2003 showed that resuspension increased light attenuation, especially in the northernmost portion of the Bay, shifting primary production downstream. Resuspension also increased remineralization in the central Bay, which experienced larger organic matter concentrations due to the downstream shift in primary productivity and estuarine circulation. As a result, oxygen decreased and ammonium increased throughout the Bay in the bottom portion of the water column, due to reduced photosynthesis in the northernmost portion of the Bay and increased remineralization in the central Bay. Averaged over the channel, resuspension decreased oxygen by ~ 25% and increased ammonium by ~ 50% for the bottom water column. Changes due to resuspension were of the same order of magnitude as, and generally exceeded, short-term variations within individual summers, as well as interannual variability between 2002 and 2003, which were wet and dry years, respectively. Our results quantify the degree to which sediment resuspension and transport affect biogeochemistry, and provide insight into how coastal systems may respond to management efforts and environmental changes.

Tidal currents and wind waves controlling sediment distribution in a subtidal point bar of the Venice Lagoon (Italy)

Sedimentology ◽  
2019 ◽  
Vol 66 (7) ◽  
pp. 2926-2949 ◽  
Author(s):  
Massimiliano Ghinassi ◽  
Andrea D'Alpaos ◽  
Laura Tommasini ◽  
Lara Brivio ◽  
Alvise Finotello ◽  
...  
Keyword(s):  
Wind Waves ◽  
Venice Lagoon ◽  
Tidal Currents ◽  
Point Bar ◽  
Sediment Distribution

scholarly journals Tidal Currents versus Wind Waves

Nature ◽  
1881 ◽  
Vol 24 (620) ◽  
pp. 460-460
Author(s):  
G. H. KINAHAN
Keyword(s):  
Wind Waves ◽  
Tidal Currents

Effects of tidal currents on winter wind waves in the Qiongzhou Strait: a numerical study

2020 ◽  
Vol 39 (11) ◽  
pp. 33-43
Author(s):  
Peng Bai ◽  
Zheng Ling ◽  
Cong Liu ◽  
Junshan Wu ◽  
Lingling Xie
Keyword(s):  
Numerical Study ◽  
Wind Waves ◽  
Tidal Currents ◽  
Qiongzhou Strait

scholarly journals MODELLING WAVE-TIDE INTERACTIONS AT A WAVE FARM

2011 ◽  
Vol 1 (32) ◽  
pp. 34 ◽  
Author(s):  
Raul Gonzalez-Santamaria ◽  
Qingping Zou ◽  
Shunqi Pan ◽  
Roberto Padilla-Hernandez
Keyword(s):  
Sediment Transport ◽  
Wind Waves ◽  
Tidal Currents ◽  
Bottom Friction ◽  
Main Question ◽  
Tidal Elevation ◽  
Coastal Morphology ◽  
Energy Devices ◽  
Wave Farm ◽  
Modelling System

The Wave Hub project will create the world’s largest wave farm off the coast of Cornwall, Southwest England. This study is to investigate wave and tide interactions, in particular their effects on bottom friction and sediment transport at the wave-farm coast. This is an ambitious project research which includes the use of a very complex numerical modelling system. The main question to answer is how waves, tidal currents and winds affect the bottom friction at the Wave Hub site and the near-shore zone, as well as their impact on the sediment transport. Results show that tidal elevation and tidal currents have a significant effect on the wave height predictions, tidal forcing and wind waves have a significant effect on the bed shear-stress, relevant to sediment transport, waves via radiation stresses have an important effect on the long-shore and cross-shore velocity components, particularly during the spring tides, waves can impact on bottom boundary layer and the mixing in the water column. Interactions between waves and tides at the Wave Hub site is important when modelling coastal morphology influenced by wave energy devices, this open-source modelling system tool will help the study of physical impacts on the Wave Hub farm area.

scholarly journals On the Wave Bottom Shear Stress in Shallow Depths: The Role of Wave Period and Bed Roughness

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1348 ◽  
Author(s):  
Sara Pascolo ◽  
Marco Petti ◽  
Silvia Bosa
Keyword(s):  
Shear Stress ◽  
Dynamic Equilibrium ◽  
Dominant Role ◽  
Wind Waves ◽  
Sediment Resuspension ◽  
Growth Curves ◽  
Finite Depth ◽  
Wave Period ◽  
Bed Shear Stress

Lagoons and coastal semi-enclosed basins morphologically evolve depending on local waves, currents, and tidal conditions. In very shallow water depths, typical of tidal flats and mudflats, the bed shear stress due to the wind waves is a key factor governing sediment resuspension. A current line of research focuses on the distribution of wave shear stress with depth, this being a very important aspect related to the dynamic equilibrium of transitional areas. In this work a relevant contribution to this study is provided, by means of the comparison between experimental growth curves which predict the finite depth wave characteristics and the numerical results obtained by means a spectral model. In particular, the dominant role of the bottom friction dissipation is underlined, especially in the presence of irregular and heterogeneous sea beds. The effects of this energy loss on the wave field is investigated, highlighting that both the variability of the wave period and the relative bottom roughness can change the bed shear stress trend substantially.

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