Strategies to Combine the Functions of Ecology and Navigation in the Scheldt Estuary

Smit, H.P.; Kop, R.; Westmacott, S.

doi:10.1111/j.1747-6593.1997.tb00125.x

Cited by 6 publications

(1 citation statement)

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“…120 km. The Dutch section of the estuary consists of approximately 209 km 2 of open water, 82 km 2 of intertidal area and 24 km 2 of saltmarshes (SMIT et al, 1997). The Molenplaat is a predominantly sandy mid-channel intertidal flat in the Dutch section of the Westerschelde estuary with a surface area of approximately 1.5 km 2 , while Biezelingsche Ham is a somewhat smaller nearby area of intertidal mudflat on the northern bank of the estuary (Figure 2a).…”

Section: Study Site: Westerschelde Estuary the Netherlandsmentioning

confidence: 99%

Using Hyperspectral Imaging for the Assessment of Mudflat Surface Stability

Smith

Thomson

Moöller

et al. 2004

Journal of Coastal Research

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SMITH, G.M.; THOMSON, A.G.; MÖ LLER, I., and KROMKAMP, J.C., 2004. Using hyperspectral imaging for the assessment of mudflat surface stability.The successful management of fine-grained coastal environments relies on an understanding of, and an ability to predict, their likely future behavior. The latter depends not only on the hydrodynamic conditions to which these coastal systems are exposed, but also on characteristic surface properties that determine erosion shear strength and thus surface stability. Due to the inaccessibility of intertidal areas, precise ground-based measurements of mudflat stability are difficult to conduct. Remote sensing can provide full spatial coverage and non-intrusive measurement. As stability changes on mudflats are linked to subtle differences in mudflat surface characteristics, they can potentially be mapped by hyperspectral data. This paper reports on a study aimed at assessing the suitability of hyperspectral data for estimating mudflat characteristics related to stability. Hyperspectral images were collected along with near contemporary ground measurements. An unsupervised classification resulted in a map that reproduced observed thematic and topographic features, thus highlighting the close link between topography and surface sedimentary characteristics resulting in distinct spectral signatures. Multiple regression analysis was used to relate surface characteristics to hyperspectral data to construct regression equations. Erosion shear stress was estimated directly from the hyperspectral data and also by a relationship with surface characteristics. The results of the thematic class map matched well with the known situation at the site during image acquisition. The quantitative information on surface characteristics suggest that the use of hyperspectral data for the assessment of erosion shear stress, surface stability, and thus the likely future behaviour in this dynamic environment can contribute to a significant improvement in the information needed for the successful management of shallow coastal systems.

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Section: Study Site: Westerschelde Estuary the Netherlandsmentioning

confidence: 99%

Using Hyperspectral Imaging for the Assessment of Mudflat Surface Stability

Smith

Thomson

Moöller

et al. 2004

Journal of Coastal Research

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A Saxon Fish Weir and Undated Fish Trap Frames Near Ashlett Creek, Hampshire, UK: Static Structures on a Dynamic Foreshore

Cooper

Caira²,

Opdebeeck³

et al. 2017

J Mari Arch

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The remains of a wooden V-shaped fish weir and associated structures have been discovered near Ashlett Creek on the tidal mudflats of Southampton Water in Hampshire, southern Britain. Radiocarbon dating of oak roundwood stakes taken from the main weir structure date it to the middle Saxon period. Clusters of as-yet undated roundwood posts within the catchment area of the weir are interpreted as the frames for fish traps that are assumed to pre-or post-date the operational period of the weir itself. The weir is contemporary with wooden V-shaped fish weirs found elsewhere in southern and central Britain, and also Ireland, but its circular catchment 'pound' remains restricted, in these islands, to the Solent and Severn estuaries: it has a close parallel with another Saxon-era weir on the nearby Isle of Wight. It also shows striking structural similarities with examples in use today in Basse Normandy, on the southern shore of the English Channel. The paper discusses the function and operation of the weir, and places it in its social and historical context. Regressive cartography demonstrates that the structures have become exposed as a result of saltmarsh retreat in this area of Southampton Water since the nineteenth century. The radiocarbon dates returned for the posts demonstrate that this transgression of the marsh must have been preceded by a prolonged period of progradation, which covered and preserved the site; its subsequent re-exposure has negative implications for its survival.

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