Modeling tidal distortion in the Ogeechee Estuary

Bruder, Brittany; Bomminayuni, Sandeep Kumar; Haas, Kevin A.; Stoesser, Thorsten

doi:10.1016/j.ocemod.2014.08.004

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…For a time series of tidal water levels, the imaginary part of a Hilbert‐transformed tidal height leads to positive and negative outputs for falling and rising tides, respectively (see Figure S3). Therefore, a positive value of the transformed skewness measure suggests longer rising tidal durations than falling tide durations on average (i.e., ebb dominance), and a negative value indicates longer falling tidal durations (i.e., flood dominance) (Bruder et al, ). To further validate the general effectiveness of the transformed skewness, we apply it to the constructed signals in Figure and find that the transformed skewness is consistently zero for the sinusoidal signal (S), and the positively (PS) and negatively (NS) skewed signals in Figure a, thus implying no tidal asymmetry.…”

Section: Methods Reviewmentioning

confidence: 99%

“…The skewness measure is also applicable for quantification of peak current asymmetry and slack water asymmetry (Bruder et al, ; Gong et al, ; Guo et al, ). Skewed current curves (preponderance of large crests or troughs) have unequal peak ebb and flood currents, demonstrating the presence of peak current asymmetry but not slack water asymmetry (see Figure a).…”

Section: Methods Reviewmentioning

confidence: 99%

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Quantification of Tidal Asymmetry and Its Nonstationary Variations

et al. 2019

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Tidal wave deformation and tidal asymmetry widely occur in tidal estuaries and lagoons. Tidal asymmetry has been intensively studied because of its controlling role on residual sediment transport and large-scale morphological evolution. There are several methods available to characterize tidal asymmetry prompting the need for an overview of their applicability and shortcomings. In this work we provide a brief review and evaluation of two methods, namely, the harmonic method and the statistical method. The latter comprises several statistical measures that estimate the probability density function and various forms of skewness. We find that both the harmonic and statistical methods are effective and have complementary advantages. The harmonic method is applicable to predominantly semidiurnal or diurnal regimes, while the statistical methods can be used in mixed tidal regimes. Assisted by harmonic data, a modified skewness measure can isolate the contribution of different tidal interactions on net tidal asymmetry and also reveal its subtidal variations. The application of the skewness measure to nonstationary river tides reveals stronger tidal asymmetry during spring tides than neap tides, and the nonlinear effects of river discharges on tidal asymmetry in the upper and lower regions of long estuaries.Plain Language Summary Astronomical tide is the primary forcing that drives water motion and subsequent sediment transport and morphological changes in coastal and estuaries waters. Tidal waves propagating from open oceans into tidal estuaries and lagoons often experience changes in wave amplitude, speed, and shape, displaying tidal wave deformation and associated tidal asymmetry that is featured by unequal rising and falling tidal periods. This work first provides a brief review of the methods available for the quantification of tidal asymmetry in varying tidal environments, and discusses their applicability based on constructed data. The application of these two methods to measured nonstationary tides in a long estuary under significant time-varying river discharges reveal strongly nonlinear and nonuniform features of tidal asymmetry. The findings of this work have implications for the interpretation of high water levels in flood management and large-scale estuarine morphological evolution. Key Points:• Both harmonic and statistical methods are effective in indicating tidal asymmetry • Statistical methods are applicable in quantifying nonstationary variations • We find nonlinear effects of river discharge on tidal asymmetry in long estuariesSupporting Information:• Supporting Information S1

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Section: Methods Reviewmentioning

confidence: 99%

Section: Methods Reviewmentioning

confidence: 99%

Quantification of Tidal Asymmetry and Its Nonstationary Variations

et al. 2019

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“…The Ogeechee River originates from the hilled areas of the Piedmont and the level Coastal Plain and discharges into Ossabaw Sound (Kennedy, 1964; Dame et al ., 2000). The estuary is bound by extensive wetlands and salt marshes, known to have minimal freshwater discharge, and oriented perpendicular to the North Atlantic coastline (Bruder et al ., 2014; Konhauser et al ., 2020). The Ogeechee River contains abundant dissolved organic material, such as humic acids and tannins, derived from adjacent wetlands and marshes (Dame et al ., 2000; Konhauser et al ., 2020).…”

Section: Geological Settingmentioning

confidence: 99%

The influence of invertebrate faecal material on compositional heterogeneity, diagenesis and trace metal distribution in the Ogeechee River estuary, Georgia, USA

et al. 2020

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Bioturbating organisms contribute significantly to elemental cycling in sediments through burrowing, grazing, organic matter and altering porewater chemical conditions. In the process, organisms are known to produce copious amounts of faecal material at high rates, sometimes in excess of 1 000 000 kg day−1 in a 1 km2 area. Material from three organisms (Arenicola marina, Callichirus major and Diopatra cuprea) was collected from two locations, Raccoon Key and Steamboat Pass, in the Ogeechee River estuary, Georgia, USA, to explore how faecal production affects organic carbon cycling and clay mineralogies. The individual organisms’ feeding strategies played a strong role in the extent to which they concentrate organic matter and lead to the formation of clay minerals. The faecal material of filter feeding Diopatra cuprea and selective deposit feeding Callichirus major contains up 45.8% and 47.3% kaolinite, respectively, while kaolinite is below detection limits in the surrounding matrix. By contrast, the non‐selective deposit‐feeder Arenicola marina does not appear to form or concentrate clay minerals. Callichirus major increases organic carbon contents at Raccoon Key by 68‐fold and Diopatra cuprea increases total organic carbon (w/w%) by 119‐fold and 32‐fold at Raccoon Key and Steamboat Pass, respectively. Arenicola marina, in contrast, does not noticeably concentrate organic matter in its faecal material, most likely as a consequence of non‐selective deposit‐feeding. Potentiometric titration data was used to explore surface reactivity and metal sorption. Diopatra cuprea and Callichirus major faecal material has strong metal binding affinities relative to the surrounding matrix, thereby increasing the potential for trace metals to be sequestered into the sedimentary record. The widespread occurrence of invertebrate faecal material enriched in clay minerals and organic matter likely has a significant influence on organic matter, grain size and trace metal distribution in estuarine sediments.

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Subgrid modeling of salt marsh hydrodynamics with effects of vegetation and vegetation zonation

Liang

et al. 2017

Earth Surf Processes Landf

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Vegetation plays a critical role in modifying inundation and flow patterns in salt marshes. In this study, the effects of vegetation are derived and implemented in a high-resolution, subgrid model recently developed for simulating salt marsh hydrodynamics. Vegetation-induced drag forces are taken into account as momentum sink terms. The model is then applied to simulate the flooding and draining processes in a meso-tidal salt marsh, both with and without vegetation effects. Marsh inundation and flow patterns are significantly changed with the presence of vegetation. A smaller area of inundation occurs when vegetation is considered. Tides propagate both on the platform and through the channels when vegetation is absent, whereas flows concentrate mainly in channels when vegetation is present. Local inundation on vegetated platforms is caused mainly by water flux spilled from nearby channels, with a flow direction perpendicular to the channel edges, whereas inundation on bare platforms has contributions from both local spilled-over water flux and remote advection from adjacent platforms. The flooding characteristics predicted by the model showed a significant difference between higher marsh and lower marsh, which is consistent with the wetlands classification by the National Wetlands Inventory (NWI). The flooding characteristics and spatial distribution of hydroperiod are also highly correlated with the vegetation zonation patterns observed in Google Earth imagery. Regarding the strong interaction between flow, vegetation and geomorphology, the conclusion highlights the importance of including vegetation in the modeling of salt marsh dynamics.

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Modeling tidal distortion in the Ogeechee Estuary

Cited by 12 publications

References 22 publications

Quantification of Tidal Asymmetry and Its Nonstationary Variations

Quantification of Tidal Asymmetry and Its Nonstationary Variations

The influence of invertebrate faecal material on compositional heterogeneity, diagenesis and trace metal distribution in the Ogeechee River estuary, Georgia, USA

Subgrid modeling of salt marsh hydrodynamics with effects of vegetation and vegetation zonation

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