A new GIS approach for reconstructing and mapping dynamic late Holocene coastal plain palaeogeography

Pierik, H.J.; Cohen, K.M.; Stouthamer, Esther

doi:10.1016/j.geomorph.2016.05.037

Cited by 32 publications

(50 citation statements)

References 43 publications

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“…, ; Pierik et al. , ) of former estuaries where the morphology of bars is typically not recognizable in the geological record. This exercise may be especially relevant for bar‐built, high‐stand estuaries which are sufficiently filled with sediment, such that the bar pattern has been developed.…”

Section: Discussionmentioning

confidence: 99%

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Topographic forcing of tidal sandbar patterns for irregular estuary planforms

Leuven

Haas

Braat

et al. 2017

Earth Surf Processes Landf

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Estuaries typically show converging planforms from the sea into the land. Nevertheless, their planform is rarely perfectly exponential and often shows curvature and the presence of embayments. Here we test the degree to which the shapes and dimensions of tidal sandbars depend on estuary planform. We assembled a dataset with 35 estuary planforms and properties of 190 tidal bars to induce broad-brush but significant empirical relations between channel planform, hydraulic geometry and bar pattern, and tested a linear stability theory for bar pattern. We found that the location where bars form is largely controlled by the excess width of a channel, which is calculated as the observed channel width minus the width of an ideal exponentially widening estuary. In general, the summed width of bars approximates the excess width as measured in the along-channel variation of three estuaries for which bathymetry was available as well as for the local measurements in the 35 investigated estuaries. Bar dimensions can be predicted by either the channel width or the tidal prism, because channel width also strongly depends on local tidal prism. Also braiding index was predicted within a factor of 2 from excess width divided by the predicted bar width. Our results imply that estuary planform shape, including mudflats and saltmarsh as well as bar pattern, depend on inherited Holocene topography and lithology and that eventually convergent channels will form if sufficient sediment is available.

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Section: Discussionmentioning

confidence: 99%

“…, ; Pierik et al. , ), for which boundaries are well known but bars are usually not preserved, as well as estuaries in numerical models and laboratory experiments (Kleinhans et al. ).…”

Section: Discussionmentioning

confidence: 99%

Topographic forcing of tidal sandbar patterns for irregular estuary planforms

Leuven

Haas

Braat

et al. 2017

Earth Surf Processes Landf

View full text Add to dashboard Cite

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“…Our empirical method is capable of making quantitative estimates of the bar dimensions, the number of bars and channels (Braiding Index), channel dimensions, flow conditions and salinities. The tool is applicable for palaeogeographical reconstructions [70,71] where the shape of tidal channel belts or estuaries has been identified, but wherein bar configuration is typically not recognisable and typical flow conditions are unknown. If the along-channel width profile is known and the tidal range can be estimated, the tool presented in this study can be applied.…”

Section: Application In Palaeogeographic Reconstructionmentioning

confidence: 99%

Empirical Assessment Tool for Bathymetry, Flow Velocity and Salinity in Estuaries Based on Tidal Amplitude and Remotely-Sensed Imagery

et al. 2018

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Hydromorphological data for many estuaries worldwide is scarce and usually limited to offshore tidal amplitude and remotely-sensed imagery. In many projects, information about morphology and intertidal area is needed to assess the effects of human interventions and rising sea-level on the natural depth distribution and on changing habitats. Habitat area depends on the spatial pattern of intertidal area, inundation time, peak flow velocities and salinity. While numerical models can reproduce these spatial patterns fairly well, their data need and computational costs are high and for each case a new model must be developed. Here, we present a Python tool that includes a comprehensive set of relations that predicts the hydrodynamics, bed elevation and the patterns of channels and bars in mere seconds. Predictions are based on a combination of empirical relations derived from natural estuaries, including a novel predictor for cross-sectional depth distributions, which is dependent on the along-channel width profile. Flow velocity, an important habitat characteristic, is calculated with a new correlation between depth below high water level and peak tidal flow velocity, which was based on spatial numerical modelling. Salinity is calculated from estuarine geometry and flow conditions. The tool only requires an along-channel width profile and tidal amplitude, making it useful for quick assessments, for example of potential habitat in ecology, when only remotely-sensed imagery is available.

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“…Berendsen & Stouthamer, 2001;Busschers, 2008;Westerhoff, 2009;Peeters et al, 2016). The set of 12 palaeogeographical maps in the Atlas van Nederland in het Holoceen (Vos et al, 2011) and updated versions (Vos & De Vries, 2013) show the impressive detail currently reached for different parts of the Netherlandsowing to continued data collection and computerised data combination (Hoek, 1997b;Van der Meulen et al, 2013;Pierik et al, 2016;Cohen et al, 2017a,b;Woolderink et al, 2019) as well as to the inspiration of Zagwijn's palaeogeographical legacy (Berendsen & Stouthamer, 2001;Westerhoff, 2009;Vos, 2015).…”

Section: Palaeogeographical Mapsmentioning

confidence: 99%

Waldo Heliodoor Zagwijn (1928–2018): the instigator and architect of European chronostratigraphy

Hooghiemstra

Hoek

2019

Netherlands Journal of Geosciences

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On 26 June 2018 Waldo Heliodoor Zagwijn died at the age of 89. He was an Emeritus Professor of the Faculty of Earth Sciences, Vrije Universiteit in Amsterdam. As a geologist, palynologist and palaeobotanist he focused on developing a stratigraphy of the Netherlands based on changes in vegetation and climate. The Dutch setting of a subsiding basin, and the clear signal of a sequence of glacial–interglacial cycles, was promising. As early as the late 1950s it became clear that the Quaternary Period included more than the previously assumed four ice ages in the Netherlands. In his PhD thesis Zagwijn defined the start of the Quaternary around 2.5 million years before the present (2.5 Ma). The international community accepted Zagwijn’s arguments after he retired. He showed how the rivers Meuse, Scheldt and Rhine had built the Netherlands in four dimensions. He is the instigator and architect of the climate- and chronostratigraphy of the Quaternary Period of Western Europe.

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A new GIS approach for reconstructing and mapping dynamic late Holocene coastal plain palaeogeography

Cited by 32 publications

References 43 publications

Topographic forcing of tidal sandbar patterns for irregular estuary planforms

Topographic forcing of tidal sandbar patterns for irregular estuary planforms

Empirical Assessment Tool for Bathymetry, Flow Velocity and Salinity in Estuaries Based on Tidal Amplitude and Remotely-Sensed Imagery

Waldo Heliodoor Zagwijn (1928–2018): the instigator and architect of European chronostratigraphy

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