In the wave-cut model, the formation and propagation of a new modern shore platform is a response to rises in sea level and tectonic uplift. The sea attacks a weakness in the base of the cliff. This then has the effect of creating a notch which slowly becomes larger and larger, forming a small cave. The waves undermine this portion until the roof of the cave cannot hold due to the pressure and freeze-thaw or biological weathering acting on it, and collapses, resulting in the cliff retreating landward. When this happens, the platform is called a … This can result multiple levels of wave-cut platforms. … Results showed that breaking and broken waves formed platforms, while standing waves did not. Notch eroded by waves breaking @ foot of cliff 3. Wave-cut platform, also called Abrasion Platform, gently sloping rock ledge that extends from the high-tide level at the steep-cliff base to below the low-tide level. Wave-cut platforms form when destructive waves hit against the cliff face, causing an undercut between the high and low water marks, mainly as a result of abrasion, corrosion and hydraulic action, creating a wave-cut notch. Resistant rock that does not get eroded entirely during the formation of a wave-cut platform will remain behind to form a stack. 2. Practice GCSE-style exam question: Explain the formation of a wave-cut platform (4) Practice GCSE-style exam question: Explain the reasons for differences between … Wave-cut platforms are often most obvious at low tide when they become visible as huge areas of flat rock. In order to understand wave-cut platform initiation at a time of stationary sea level, a wave flume experiment was conducted. The tower of rock left behind from a collapsed arch is called a sea stack (Figure 13.3.4). The material from the collapsed cliff face is eroded and transported away. Abrasion is where cliffs are worn down from destructive waves and the throwing of material in the waves. For example, this could be a joint in chalk. Further erosion causes the overhanging part of the cave to collapse into the sea and a cliff… During post-glacial periods of high sea ... platform formation is a function of a platforms exposure to wave energy, the rate of weathering, The cliff retreats inland. Abrasion is where cliffs are worn down from destructive waves and the throwing of material in the waves. Request Permissions. The wave-cut platform may be covered in a thin veneer of reworked sediment or may be bare. STUDY. Explain the formation of a wave-cut platform. Massive rocks, like granite, is resistant to abrasion and can even stop a platform formation. Photograph of a wave-cut platform across tilted rocks that are part of the circa 38-million-year-old Coaledo Formation. This results in a wave cut notch in the cliff. Have a Free Meeting with one of our hand picked tutors from the UK’s top universities. A wave-cut notch is created by erosional processes such as hydraulic action and abrasion . Shingle beaches are typical of Sussex and between Brighton and Eastbourne they are backed by chalk cliffs dating back over 70 million years when the chalk deposits formed at the bottom of a shallow warm sea. After one is uplifted above sea level, another one will form at sea level. Results showed that breaking and broken waves formed platforms, while standing waves did not. Since its origins in 1890 as one of the three main divisions of the University of Chicago, The University of Chicago Press has embraced as its mission the obligation to disseminate scholarship of the highest standard and to publish serious works that promote education, foster public understanding, and enrich cultural life. A wave cut platform is formed by the sea attacking the cliff face though different types of erosion e.g. A steep model cliff was exposed to three different types of waves: standing, breaking, and broken waves. Wave erosion along a line of weakness produces a cut called a notch on the coast. Formation of wave cut platform 1. 4. So after a while a platform is formed: (a wave cut platform is also called a abrasion platform) The wave cut platforms are dependent on the rock structure. This notch then enlarges into a cave. JSTOR®, the JSTOR logo, JPASS®, Artstor®, Reveal Digital™ and ITHAKA® are registered trademarks of ITHAKA. A steeply sloping coast is subjected to sea waves; Due to wave attacks a notch is formed. As erosion continues to occur, the weight of the cliff eventually cannot support itself and collapses as a result with the material being deposited and then carried out to sea. This rock above the notch is weathered until it can no longer support itself . Insight into Geography Resources. On them rest rounded sandstone boulders, gravel and sand, up to a metre thick, often cemented by manganese and iron. Stage 3. Continuous erosion causes the cliff to move back or retreat inland. A wave cut platform is made at a place where there is a cliff next to the sea. When the waves of the sea are hitting against the cliffs, The under part will slowly cut away. The formation of a wave cut platform. The notch is further eroded to form a cave, a hallow with an opening in a mass of rock. Subject: Geography. All Rights Reserved. JG publishes original research across a broad range of subfields in geology, including geophysics, geochemistry, sedimentology, geomorphology, petrology, plate tectonics, volcanology, structural geology, mineralogy, and planetary sciences. If the region is undergoing tectonic uplift, the platform is raised above sea level. Caves, arches and stacks are usually found on headlands, as these are eroded by the waves from three sides. Such deep notches would mean platform formation in reality, since the overhanging part of the notches would have collapsed due to the effects of stratifications, joints, faults, and weather-ing. A steep model cliff was exposed to three different types of waves: standing, breaking, and broken waves. Posted by . A wave-cut platform, shore platform, coastal bench, or wave-cut cliff is the narrow flat area often found at the base of a sea cliff or along the shoreline of a lake, bay, or sea that was created by erosion. This leaves a wave-cut platform. Over time, a wave-cut platform is formed at the foot of the cliff. One to one online tuition can be a great way to brush up on your Geography knowledge. Discordant coastlines form where geology alternates between bands of hard and soft rock (see image below). abrasion and hydraulic action. Formation of a wave cut platform Posted 21 Dec 2016 - 2 Minute Read. In the development of these platforms, impulsive pressure was predominant in the physical action of breaking waves, while shearing force was dominant in broken waves. As the notch becomes larger the cliff becomes unstable and collapses as the result of gravity. Many of its articles have wide appeal for geologists, present research of topical relevance, and offer new geological insights through the application of innovative approaches and methods. Formation. The wave-cut platform is formed through the following steps. Resource type: Worksheet/Activity (no rating) 0 reviews. A wave … STUDY. Resources that I have put a significant amount of time into have a price (kept to the lowest tariff possible), others are free to use. Read your article online and download the PDF from your email or your account. The platform produced by breaking waves was located lower than that made by broken waves. With a personal account, you can read up to 100 articles each month for free. Mechanism of platform initiation.-There are two kinds of forces acting on a cliff face: (1) the normal force-pressure, and It leaves behind at its base, a wave-cut platform. This rock above the notch is weathered until it can no longer support itself Although, as given in figure 8, the max-imum pressure intensity, Pmax, is some-what different according to the different researchers, the following equation would be a valid approximation: Pmax/WHo = 35, (2) The upper part of this stack is made up of rock that resisted erosion, and that rock has protected a small pedestal of underlying softer rock. WAVE-CUT PLATFORM FORMATION FIG. To access this article, please, Access everything in the JPASS collection, Download up to 10 article PDFs to save and keep, Download up to 120 article PDFs to save and keep. A wave cut notch is formed with an overhang of rock above it. Wave-cut platforms form when destructive waves hit against the cliff face, causing undercutting between the high and low water marks, mainly as a result of corrosion and hydraulic power, creating a wave-cut notch. adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A Relatively resistant rock that does not get completely eroded during the formation of a wave-cut platform will remain behind to form a stack. Wave cut platforms at 18 to 20m and at 30m are well developed below Clarence Drive from Steenbras River Mouth to Koeëlbaai. Wave cut platforms are created as a cliff retreats, due to weathering at the top of the cliff and sea erosion at the base of the cliff. Erosion Landforms: Headlands and bays, cliffs and wave cut platforms, caves, arches and stacks Coastlines are littered with the evidence of erosion and the power of the sea. The Journal of Geology - annotated diagram and explanation - YouTube. Explanation of how wave cut platforms are created About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features © 2021 Google LLC As cliff retreats it leaves behind a rocky floor which slopes gently towards the see (wave-cut platform) In order to understand wave-cut platform initiation at a time of stationary sea level, a wave flume experiment was conducted. A wave-cut notch is created by erosional processes such as hydraulic action and abrasion. In places scree partially overlies these deposits. JSTOR is part of ITHAKA, a not-for-profit organization helping the academic community use digital technologies to preserve the scholarly record and to advance research and teaching in sustainable ways. This notch then enlarges into a cave. 3. What are Wave Cut Platforms and how are they formed? It develops as a result of wave abrasion; beaches protect the shore from abrasion and therefore prevent the formation of platforms . Hydraulic action occurs when the waves enter cracks within the cliff at the high tide mark, compressing the air within and resulting in expansion of the crack as the wave retreats. As cliffs are eroded at the base, a wave-cut notch forms, eventually the cliff collapses and the cliff retreats. Wave cut platforms. Tim Parker. As soft rock, such as glacial till, is more susceptible to erosion it erodes more rapidly than more resistant rock such as chalk. Access supplemental materials and multimedia. This leads to the cliff collapsing. Read the latest issue.One of the oldest journals in geology, The Journal of Geology (JG) has since 1893 promoted the systematic philosophical and fundamental study of geology. Formation of a wave cut platform. In the wave-cut model, the formation and propagation of a new modern shore platform is a response to rises in sea level and tectonic uplift. But sea stacks can also form during the formation of wave-cut platforms or other features, when relatively resistant rock that does not get completely eroded remains behind to form the stack.. A wave-cut platform is developed; Formation of caves, arches and stacks. Homepage - Formation. 1. Formation of a wave cut platform 2. Current issues are now on the Chicago Journals website. In places, the platform may have depressions which form rock pools at low tide. Wave Cut Platforms Wave cut platforms are made in a similar ways to waterfalls and gorges (rivers … option. A wave cut platform is formed by the sea attacking the cliff face though different types of erosion e.g. A wave cut notch is formed with an overhang of rock above it. Here the different layers of the sedimentary rock have different resistance to erosion. When the upper side of the notch collapses a cliff develops; Continued undercutting of the cliff makes the cliff to collapse and to retreat inland Chalk Wave-cut platforms and shingle. This results in a wave cut notch in the cliff. When a change in the sea level occurs, the platforms can be submerged (= ondergedompeld) or raised. Stage two. Erosion makes the coastline varied and interesting, and often give the coastline its "wow" factor. Resources from a full-time geography teacher in the East Midlands. Place the formation steps of a wave-cut platform in order from oldest to youngest. Stage two. At the base of the cliffs can also be seen a platform of rock, this is the wave cut platform and can only be seen at low tide. Weaknesses at the base of a headland are increased through erosion. A wave-cut platform is formed when the following occurs: The sea attacks the base of the cliff between the high and low water mark. Notch eroded by waves breaking @ foot of cliff 7. The wave-cut platform becomes a marine terrace if uplift or sea level drop elevates the platform above sea level. ©2000-2021 ITHAKA. 4.485714285714286 28 reviews. The perfect answer to a typical GCSE exam question 'Draw a diagram to explain the formation of a wave cut platform' This could be used to revise for the upcoming mock exams after the Christmas holidays. Check out using a credit card or bank account with. These landforms are identified by their relatively flat, seaward sloping surfaces. In order to understand wave-cut platform initiation at a time of stationary sea level, a wave flume experiment was conducted. © 1975 The University of Chicago Press This results in the This item is part of a JSTOR Collection. Select the purchase The wave cut notch can be seen around the base of all the chalk cliffs in the bay, it is at the bottom of the darkened patch on the cliffs. Headlands and baysmost commonly form along discordant coastlines. Today, the Journals Division publishes more than 70 journals and hardcover serials, in a wide range of academic disciplines, including the social sciences, the humanities, education, the biological and medical sciences, and the physical sciences. Wave-cut platforms are particularly important landforms because they indicate an elevation change of sea level and/or land surface.
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