Modelling the effect of waves, weathering and beach development on shoreplatform development
Cliff ; Coastal dynamics ; Coastal environment ; Erosion ; Mathematical model ; Model ; Shoreplatform ; Tide ; Wave
A mathematical model was used to study shoreplatform development. In addition to mechanical wave erosion, this model considers the effect of a number of other important factors, including platform downwearing by weathering, the abrasive
and protective effects of beach sediment accumulation, and variable cliff height and debris mobility. The primary goal of this study was to examine how these interacting factors influence the development of shoreplatforms in different environments, rather than
to replicate the morphology of platforms after specific periods of time.
Lacustrine shoreplatforms at Lake Waikaremoana, North Island, New Zealand
Comparative study ; Erosion rate ; Lacustrine sediment ; Lake ; Lake level ; Model ; New Zealand ; North Island ; Ocean ; Shoreplatform ; Weathering
This paper has 3 objectives. First, to describe the shoreplatforms at Lake Waikaremoana. Second, to determine whether principles governing oceanic platforms can be applied to a lacustrine setting, and third to present a conceptual model
for the development of the shoreplatforms at Lake Waikaremoana.
A Pleistocene origin for shoreplatforms along the northern Illawara coast, New South Wales
Aminostratigraphy ; Australia ; Coastal sedimentation ; Dating ; New South Wales ; Pleistocene ; Quaternary ; Sea level ; Shoreplatform ; Shoreline ; Thermoluminescence ; Tsunami
This paper examines the composition, structure and age of clastic deposits situated behind shoreplatforms at Austinmer and Coledale on the northern Illawara coast, New South Wales. The results support earlier chronological evidence of a Pleistocene
history for shoreplatforms along the Illawara coast.
Defining shoreplatform boundaries using airborne laser scan data : a preliminary investigation
Coastal environment ; Digital elevation model ; Geographical information system ; Methodology ; New Zealand ; Remote sensing ; Shoreplatform ; South Island
As an initial evaluation of the potential of digital elevation models (DEMs) and geographic information systems (GISs) for geomorphic characterization of rocky shorelines, airborne laser scan (ALS) data have been used to characterize shoreplatforms
around Shag Point, southeastern New Zealand. The main challenge involved the delineation of the shoreplatform area in terms of landward and seaward extents.
Dune calcarenite and shoreplatforms at Cape Otway, Victoria
Cape Otway is a bold headland cut in Lower Cretaceous sandstones, bordered by cliffs and shoreplatforms. It is partly overlain by Pleistocene dune calcarenites and Holocene calcareous dunes resulting from eastward migration of aeolian sand from
beach sources on the western shore. Locally, this material has spilled over the eastern shore, where there are sectors of cliff and shoreplatform cut in Pleistocene dune calcarenite, interrupting the Lower Cretaceous outcrop. It is deduced
that the Pleistocene dunes spilled over an old cliffed coastline and on to a shoreplatform that had emerged as the result of sea level lowering. The present coastal features are thus very close to Pleistocene coastal features (cliffs, shoreplatforms) developed when
Development of shoreplatforms on Kaikoura Peninsula, South Island, New Zealand. II : the role of subaerial weathering
Algae ; Coastal environment ; Coastal erosion ; New Zealand ; Shoreplatform ; South Island ; Tide
The role of subaerial weathering in the development of shoreplatforms on Kaikoura Peninsula is investigated. Evidence for weathering came from a number of distinctive surface morphologies on platforms : salt crystal growth, water layer weathering
, and slaking. Weathering processes on shoreplatform rely on repeated wetting and drying. It was found that the number of wetting and drying cycles depend not only on the pattern of tidal water levels but also on algae growth and desiccation. It is argued
that the development of shoreplatforms at kaikoura results from subaerial weathering caused by repeated wetting and drying, and not from marine erosion.
Shoreplatform abrasion in a para-periglacial environment, Galicia, northwestern Spain
Coastal environment ; Galicia ; Holocene ; Inherited features ; Marine abrasion ; Periglacial features ; Shoreplatform ; Spain ; Weathering
This paper uses surface rock hardness variations to identify present and past abrasional activity on shoreplatforms in northwestern Spain, and to show how spatial and temporal in abrasion efficacy have resulted from the exhumation and inheritance
of ancient platform surfaces from beneath Weichselian deposits.
Field observations of infragravity waves and their behaviour on rock shoreplatforms
Cliff ; Coastal dynamics ; Coastal environment ; Coastal erosion ; New Zealand ; North Island ; Sea level ; Shoreplatform ; Wave
Infragravity wave (IGW) transformation was quantified from field measurements on 2 shoreplatforms on New Zealand's east coast (Oraka and Rothesay Bay). The observed increase in IGW height over the platform during both experiments is attributed
in water level at the cliff toe during high tide. Results from this study show the first measurements of IGWs on shoreplatforms and identify long wave motion a significant process in a morphodynamic understanding of rock coast.
to shoaling. The proportional increase in IGW height shows a strong correlation to water level on each platform. The rate of shoaling of long period waves on the shallow, horizontal platforms increased at higher water levels resulting in a super elevation
Shoreplatform morphology on a rapidly uplifting coast, Wellington, New Zealand
Coastal environment ; Coastal erosion ; Coastal geomorphology ; Marine abrasion ; New Zealand ; North Island ; Shoreplatform ; Tectonics ; Vertical movement
The coast of Wellington is tectonically active and contains a series of uplifted and contemporary shoreplatforms that are developed in Triassic Greywacke. The rate of development of these platforms is rapid. The co-seismic uplift means
that the rear of the platforms is raised beyond the limits of marine process and has become an area of deposition. Although no direct process measurements were made the highly fractured nature of the bedrock appears to play a major role in platform evolution
, with wave processes being easily able to pluck blocks as evidenced by fresh erosion scars and active gravel beaches at the rear of many platforms.
Rates of tafoni weathering on uplifted shoreplatforms in Nojima-Zaki, Boso Peninsula, Japan
Many tafoni occur on the faces of marine cliffs on three uplifted shoreplatforms with different altitudes and with known ages of emergence. The AA. estimate the mean value of the ten largest depths of tafoni, the period of their formation
In the paper relations between width of shoreplatform, height of the coastal cliffs and its inclination are analysed. The study was based on profiles of the Slovenian coast obtained by remote sensing. Results show that the width of shoreplatform
decreases while the cliff height increases. The inclination of coastal cliffs reflects combination of rock resistance and transport intensity of accumulated material. The increasing of cliff inclination corresponds to increase of shoreplatform width. - (IKR)
This paper reports on an experimental investigation of short- and long-term variations in the water content of intertidal rocks of shoreplatforms in eastern Canada : it is concerned only with alternate wetting and drying although similar
Lithological control on the elevation of shoreplatforms in a microtidal setting
This paper describes shoreplatforms around Shag Point on the eastern coast of South Island, New Zealand. The interesting feature of these platforms is that within a very limited distance their elevation changes from supratidal to low tide level
. The local geology of Shag Point is described and a hypothesis put forward to account for the form of the platform at this location.
Rates and patterns of erosion on inter-tidal shoreplatforms, Kaikoura Peninsula, South Island, New Zealand
Coastal environment ; Coastal erosion ; Erosion rate ; New Zealand ; Seasonal variation ; Shoreplatform ; South Island ; Terminology ; Weathering
This paper presents measured rates of erosion on shoreplatforms at Kaikoura Peninsula. Surface lowering rates were measured with a micro-erosion meter and traversing micro-erosion meter. Differences in lowering rates were found between different
and salt weathering. This is contrary to views of shoreplatform development that have favoured marine processes over subaerial weathering.
platform types and lithologies. Season is shown statistically to influence erosion rates, with higher rates during summer than winter. The interpretation given to this is that the erosive process is subaerial weathering in the form of wetting and drying
Shore erosion by frost: an example from the Scottish Lateglacial in Studies in the Lateglacial of North-West Europe.
A well-developed raised shoreplatform (the Main Rock Platform) is described from Jura, Scarba and NE Islay, Scottish Inner Hebrides. Levelling of 175 platform fragments (approximately 1,000 altitude measurements) indicates that the feature declines
that the traditional correlation between the Main Rock Platform and a low Irish (interglacial) platform should be abandoned. Processes of shoreplatform development in polar areas are also discussed.
in altitude to the SW with a regional gradient of 0,13 m/km. It is suggested that the feature was formed by periglacial shore erosion during the Loch Lomond Stadial (Younger Dryas) and is of the same age as the Norwegian Main Line (P12). It is also proposed
Development of shoreplatforms on Kaikoura Peninsula, South Island, New Zealand. Part one : the role of waves
Coastal dynamics ; Coastal environment ; Coastal erosion ; Marine hydrology ; New Zealand ; Shoreplatform ; South Island ; Wave
The role of waves in shoreplatform development has been investigated on Kaikoura Peninsula by direct measurement of waves in deep water and on platforms at high tide. This showed that the deepwater wave environment off the Kaikoura Peninsula
is very energetic, but the amount of energy delivered to platforms is very low. An analysis of the role of breaking waves revealed that these are ineffective as an erosional agent because the depth of water offshore causes breaking before waves arrive
This paper describes the morphology of near-horizontal basalt and calcarenite shoreplatforms around Lord Howe Island as well as the lithological and process environment in which they occur. Correlations indicate that the variability in platform
elevation and width is attributable to variability in key parameters of erosion, such as rock resistance and shoreline water depth. Most platforms around the island appear to have developed over the Holocene and a conceptual model is proposed to account
for the varied morphology of platforms that have developed over this period.
Limpet erosion of chalk shoreplatforms in southeast England
Biogenic process ; Carbonate rock ; Chalk ; Coastal environment ; Coastal erosion ; England ; Intertidal zone ; Shoreplatform ; South-East England ; United Kingdom
of the extent to which limpets contribute directly to the erosion of the Sussex chalk platforms.
The development of subhorizontal shoreplatforms by waves and weathering in microtidal environments
Coastal environment ; Coastal erosion ; Intertidal zone ; Model ; Shoreplatform ; Wave ; Weathering
A mathematical wave and weathering model was used to study the formation of subhorizontal platforms in microtidal environments. Backwearing (horizontal erosion) rates by wave erosion were calculated for different tidal levels using basic wave