Concordant coastlines tend to have fewer bays and headlands. Discordant coastlines form where geology alternates between bands of hard and soft rock (see image below). As the wave approaches the coast, it gains height and drops onto a steep beach. If you continue to use this site we will assume that you are happy with it. Rocks outcrop at right angles to the sea, forming headlands and bays. In 1982, the United Nations held a Convention on the Law of the Sea (UNCLAS), where maritime (sea) boundaries were established. Because of this difference in erosion resistance, discordant coastlines are home to headlands, due to eroding hard rock, and bays, due to eroding soft rock. The coast is the border between the land and the sea. Waves are the main reason for coastal change. Add in the missing words. In contrast with emergent coastlines, submergent coastlines are coastlines submerged under water due to rising sea levels. Less resistant rocks are eroded more than the resistant . The differing resistance to erosion leads to the formation of headlands and bays. The process of erosion can create different landforms along the coastline. Subsequently there was an increase in the waters of the oceans and the sea level rose appreciably. In some cases it is estimated that there was a rise . BBC Bitesize Geoguessr Google Maps Gapminder . Fjords are created when glaciers cut through valleys and are submerged. Learn about and revise coastal landforms, whether caused by erosion or deposition, with GCSE Bitesize Geography (AQA). If the direction of classifications is the same, the pairs are concordant. Discordant coastline occurs where bands of differing rock type run perpendicular to the coast. The high degree of indentation of Bantry Bay is not solely influenced by the relative resistance of rock types, but also the orientation of strata SW-NE means that they directly face high energy Atlantic waves driven by the prevailing SW wind. What is a concordant coastline? Coastlines where different types of rock alternate between hard and soft rock are called discordant coastlines and will have more bays and headlands along its length . What is a discordant coastline? What feature is left behind as the cliff retreats? Correct! The amount of energy is dependent on the wind speed, the length of time the . This lesson was designed initially for an interview, and worked really well for a 50 minute lesson duration. BBC iPlayer 37k followers More information Discordant and concordant coasts in Dorset Find this Pin and more on KS4 Changing Landscapes of the UK by Mr Haden. A concordant coastline can take one of the following two landform types: An example of a concordant coastline is Lulworth Cove, again, in Dorset, UK (figure 3). The concordant coastline runs from west to east along the south coast. Everything you need for your studies in one place. Water quality and pollution management in the UK. We use cookies to ensure that we give you the best experience on our website. An explanation of the formation of the cove can be found on the right. The rock types are typically of . This continual process can weaken the joints and cracks in the cliff, causing pieces of rock to break off. Lulworth Cove has occurred on a concordant coastline. The Portland limestone is resistant to erosion; then to the north there is Swanage Bay where the rock type is a softer greensand. It is also known as Pacific type coastline, longitudinal coastline, or Dalmatian coastline. discordant coastline diagram. This area of the Jurassic coastline provides a habitat for a diverse range of natural life, particularly butterflies. Coastlines will expand as climate change continues. The image below (figure 2) is taken at Durlston Head, which shows the bay (yellow) and the headland (red). Anak Krakatau & Sunda Strait Tsunami Indonesia Case Study 2018. What are the differences in global calorie intake and food supply? Concordant and discordant coastlines. Aqa. Where are the areas of water deficit and surplus in the UK? Portland limestone erodes very slowly, retreating landwards by marine undercutting and collapse to form a straight W-E coastline. high and low energy coasts, geology and sea level and how these change a coastline | GEOLOGICAL structure : which create concordant and discordant coastlines ( Dalmatian and Haff ). The three marine processes that shape the coastline are erosion, transportation, and deposition. A concordant coastline with resistant Portland Limestone forming a protective stratum parallel to the sea. Erosional landforms - Coastal landforms - AQA - GCSE Geography Revision - AQA - BBC Bitesize. Over 10 million students from across the world are already learning smarter. This is because access to the coast offers the opportunity for harvesting marine resources, especially fish, as well as the ability to conduct international trade via the sea. Assessment week 2 (WB 24th February 2020) - End of unit test - Physical landscapes of the UK. Geology is the study of the types of rocks that make up the Earth's crust. The three major coastal processes include erosion, transportation and deposition. Specifically looking at the differences between concordant and discordant coastlines. The latter can happen when tectonic forces lowered the land level or when river deposits and compaction of alluvial (river) sediments occur. They are more common in winterthan in the summer. Stacks, headlands, bays, cliffs and wave-cut platforms are all included. A concordant coastline is an arrangement of rock strata along the coastline. Constructed by Australian soldiers over the course of 13 years and officially opened in 1932, the Great Ocean Road is dedicated to fallen soldiers of . Teacher. If you've been to the beach, you've been to a coastline! . Concordant coastlines tend to have fewer bays and headlands. A wave-cut notch is created by erosional processes such . There are four processes involved in the eroding coastlines. Erosion. It has a variety of other micro-features and a unique geology. Landforms in the middle course of a river. . In some cases it is estimated that there was a rise . Case studies Dorset Jurassic coast and Holderness Extended writing tasks 2 a half term. The time wind takes to blow, wind speed and the fetch (distance the sea has covered) influence wave sizes. . Human actions and Physical factors affecting the Delta. Coastlines, where the geology alternates between strata (or bands) of hard rock and soft rock are called discordant coastlines. Concordant coasts are also known as dalmatian coasts, after the Dalmatian region of Croatia, or Pacific coasts, after the coastline of Chile in South America. Wave cut platforms as illustrated in the diagram and shown in the photograph are remnants of the previous cliff line. This is a Geography revision website for the Edexcel A-Level from 2016 (so the new syllabus), and will contain my class notes, own research and detail from revision guides and textbooks. What factors influence the effects and response to tectonic activity? Both concordant and discordant. The hard rock acts as a protective barrier to the softer rock behind it preventing erosion. A chalk cliff face is at the back of the cove. (adsbygoogle = window.adsbygoogle || []).push({}); If you've found the resources on this page useful please consider making a secure donation via PayPal to support the development of the site. This is called a discordant coastline. Seven cliff-top homes are badly damaged as the largest tidal surge in 60 years batters the east coast of England. Take a look at our resources under Topics in the menu at the top of the page. A ria is a drowned river valley that leads out to the sea. lulworth cove concordant coastline. As a wave undercuts a cliff the cliff retreats. Practice Questions: Slideshow 2773107 by chanel coastlines. PBworks / Help Can the risks of volcanic eruptions be reduced? The Holderness Coastline is in the North of England and runs between the Humber Estuary in the south and a headland at Flamborough head. But do they serve as anything more than a place to go for a hike or a tan? Jaden Agassi Mlb Draft 2021, Using examples examine the differences between discordant and concordant coastlines (with diagrams) (8) Coasts - Grade Booster Using examples, examine the physical factors that can influence how fast a coastline can erode (8) Coasts - Grade Booster Examine how soft engineering could prevent coastal erosion. Discordant coastline - Source www.bbc.co.uk As soft rock, such as glacial till, is more susceptible to erosion it erodes more rapidly than more resistant rock such as chalk. Create your own unique website with customizable templates. A hard rock type is resistant to erosion and creates a promontory whilst a softer rock type is easily eroded creating a bay. More resistant Jurassic Portland Limestone forms the Peveril Point headland to the south, projecting out by 1 km. Wave diffraction happens when the narrow opening to the cove causes the waves to bend, creating an arc shape wave. A combination of geological structure and sea level riseproduces the morphology of landforms aligned parallel to the coastline. it gained popularity because it preserved beach resources and avoided the negative effects of hard structures.Instead, nourishment creates a "soft" (i.e., non-permanent) structure by creating a larger sand reservoir, pushing the shoreline seaward. The procedure for calculating concordant and discordant pairs compares the classifications for two variables (for example, X and Y) on the same two items. Concordant coasts are also known as dalmatian coasts, after the Dalmatian region of Croatia, or Pacific coasts, after the coastline of Chile in South America. How far out to territorial waters extend from the coast (or baseline)? Dip is the angle of inclination of titled strata. (For example the south or the Dorset coast) . True or False: In 1982, the United Nations Convention on the Law of the Sea created international maritime boundaries based on relative naval power. Discordant These are where rock strata or structures are aligned at an angle to the coastline. A hard rock type is resistant to erosion and creates a promontory whilst a softer rock type is easily eroded creating a bay. The northern part is Eocene clay (Barton Beds), including significant deposits of Purbeck Ball Clay. Full lesson covering the different types of erosion and geology along the coast. It is also known as Pacific type coastline, longitudinal coastline, or Dalmatian coastline. Touch device users . Use the resources provided to write notes that Wave Refraction and Coastal Defences. Historic records indicate that over 250 m of land were lost between 1600 and 1850. Part of the Dorset coastline in the UK running north from the Portland limestone of Durlston Head is a clear example of a discordant coastline. Because the soft rock is exposed, it is eroded faster than the hard rock. On a discordant coastline, alternating layers of hard and soft rock are perpendicular to the coast. Sign up to highlight and take notes. Dalmatian coastline Formed by faulting and rising sea levels since the end of the last ice age West Cork, Ireland 1.Discordant Coastline 2.Rias Rock strata meets the coast at 90 degrees in parallel bands Weaker rocks (limestones) have been eroded creating long, thin bays (rias) in-between the mudstones and old . Learn about and revise coastal landforms, whether caused by erosion or deposition, with GCSE Bitesize Geography (AQA). True or False: As sea levels rise, coastlines are likely to expand. Limited law enforcement jurisdiction to prevent crimes related to customs or trafficking. It is only when the water enters shallower areas that the water itself moves forward. During the Devensian Glacial eustatic changes lowered sea levels by 120 m. At the start of the Holocene Interglacial (10,000 years BP) led to a rapid 100 m eustatic rise in global sea levels, as 3,000 years of ice sheets and glaciers shrank.
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