Coastal landscape development — AQA A-Level Geography
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Coastal landscape development explained
When studying coastal landscape development, your case studies and examples must extend beyond the United Kingdom to encompass a global perspective.
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You are required to investigate a variety of international coastal landscapes, such as the high-energy coastlines of New Zealand, the mangrove ecosystems of the Sundarbans, or the submergent features of the Dalmatian coast. While non-UK examples are mandatory to demonstrate an understanding of diverse geological and climatic influences on coastal systems, you may also integrate UK examples, like the Holderness Coast or Dorset's Jurassic Coast, to provide familiar comparative context. Ensure you can contrast these varied landscapes to explain different geomorphological processes and landforms.
Origin and development of landforms and landscapes of coastal erosion: cliffs and wave cut platforms, cliff profile features including caves, arches and stacks; factors and processes in their development.
Coastal erosion creates distinct landforms through processes like hydraulic action, abrasion, and corrosion. Cliffs retreat as waves undercut the base, forming a wave-cut notch. Over time, the unsupported overhang collapses, leaving a gently sloping wave-cut platform that dissipates wave energy. Cliff profile features develop where rock resistance varies. Faults or joints are exploited to form caves. If a cave erodes through a headland, an arch forms. Weathering and gravity eventually cause the arch roof to collapse, leaving an isolated stack. Factors influencing this development include rock lithology (hard vs soft), geological structure (dip and faults), wave energy, and sub-aerial weathering processes.
Origin and development of landforms and landscapes of coastal deposition. Beaches, simple and compound spits, tombolos, offshore bars, barrier beaches and islands and sand dunes; factors and processes in their development.
Coastal deposition occurs when wave energy decreases, allowing sediment to accumulate. Beaches form in sheltered bays via constructive waves. Longshore drift transports sediment along the coast; where the coastline changes direction, simple spits extend into the sea, while compound spits feature multiple recurved laterals. If a spit connects the mainland to an island, a tombolo forms. Offshore bars develop parallel to the coast where waves break early, whereas barrier beaches and islands are larger, permanent ridges sheltering lagoons. Sand dunes form onshore as wind blows dry sand inland, trapped by obstacles and stabilised by vegetation like marram grass. Factors include sediment supply, wave type, and tidal range.
Estuarine mudflat/saltmarsh environments and associated landscapes; factors and processes in their development.
Estuarine mudflats and saltmarshes develop in low-energy, sheltered coastal environments like the Severn Estuary. The primary process is flocculation, where fine clay particles aggregate in saline water, becoming heavier and settling out of suspension to form mudflats. Over time, pioneer halophytes like Spartina colonise the mud, their roots stabilising the sediment and trapping further material. This initiates a halosere succession, raising the land surface and allowing less salt-tolerant plants to establish, eventually forming a mature saltmarsh landscape with associated features like tidal creeks and salt pans. Key factors influencing this development include tidal range, sediment supply, wave energy, and sea-level changes.
Eustatic, isostatic and tectonic sea level change: major changes in sea level in the last 10,000 years.
Sea-level change occurs through eustatic, isostatic, and tectonic processes. Eustatic change is a global alteration in sea volume or ocean basin capacity, often driven by glacial melting or thermal expansion. Isostatic change is a localised adjustment of land height, such as the post-glacial rebound occurring in northern Britain following the melting of Pleistocene ice sheets. Tectonic changes involve localised land movements from faulting or volcanic activity, altering relative sea levels. Over the last 10,000 years (the Holocene), global eustatic sea levels rose rapidly due to the melting of the last major ice sheets (the Flandrian Transgression), before stabilising around 3,000 years ago, though recent decades show renewed eustatic rise.
Coastlines of emergence and submergence. Origin and development of associated landforms: raised beaches, marine platforms; rias, fjords, Dalmatian coasts.
Coastlines of emergence form when relative sea level falls, typically due to isostatic rebound following deglaciation outpacing eustatic sea-level rise. This exposes former coastal features, creating raised beaches (relict beaches above current high tide) and marine platforms (uplifted wave-cut platforms), as seen in Fife, Scotland. Conversely, coastlines of submergence occur when relative sea level rises, flooding existing topography. Rias are drowned river valleys with dendritic patterns, like the Kingsbridge Estuary. Fjords are drowned glacial troughs with steep sides and a shallow rock lip, such as Sognefjord. Dalmatian coasts form where valleys parallel to the coast are flooded, leaving islands aligned with the mainland, as in Croatia.
Recent and predicted climatic change and potential impact on coasts.
Recent climatic change has driven a global eustatic sea-level rise of approximately 3.4 mm per year, primarily through thermal expansion of oceans and the melting of terrestrial ice sheets. Predicted climatic changes suggest an acceleration of this trend, with sea levels potentially rising by 0.3 m to over 1.0 m by 2100 depending on emission pathways. The potential impacts on coasts are severe, including increased frequency and magnitude of coastal flooding, accelerated rates of coastal erosion, and the permanent inundation of low-lying areas like the Maldives. Furthermore, warmer sea surface temperatures may increase the intensity of tropical cyclones, exacerbating storm surges and threatening coastal infrastructure and ecosystems such as salt marshes.
The relationship between process, time, landforms and landscapes in coastal settings.
Coastal landscapes are dynamic systems shaped by the continuous interaction of geomorphic processes over varying timescales. Short-term processes, such as diurnal tides or storm events, rapidly alter individual landforms like beaches or spits. Over millennia, long-term processes like sea-level change and tectonic uplift combine with weathering and erosion to carve extensive landscapes, such as emergent coastlines featuring raised beaches and relict cliffs. Understanding this relationship requires viewing landforms as transient features that collectively form the broader coastal landscape, constantly evolving towards a state of dynamic equilibrium as energy inputs and material flows fluctuate over time.
Your focus
- Identify and describe the geomorphological features of diverse coastal landscapes outside the UK.
- Compare the physical processes shaping non-UK coastlines with those affecting UK examples.
- Evaluate how varying global climates and geologies influence coastal landscape development.
Show all 24 objectives
- Describe the sequence of formation for cliffs, wave-cut platforms, caves, arches, and stacks.
- Explain the marine and sub-aerial processes responsible for the development of erosional landforms.
- Evaluate the factors, including geology and wave energy, that influence the rate and nature of coastal erosion.
- Explain the formation of beaches, spits, tombolos, offshore bars, barrier beaches, barrier islands, and sand dunes.
- Analyse the role of longshore drift and wave energy in creating depositional landscapes.
- Evaluate the factors that influence the continued development and stability of coastal depositional landforms.
- Describe the physical and biological processes that form estuarine mudflats and saltmarshes.
- Explain the role of flocculation and pioneer species in sediment accumulation.
- Evaluate the factors that influence the development and morphology of these coastal landscapes.
- Differentiate between eustatic, isostatic, and tectonic causes of sea-level change.
- Describe the mechanisms of post-glacial isostatic adjustment and thermal expansion.
- Summarise the major trends in global sea-level change over the last 10,000 years.
- Explain the processes leading to coastlines of emergence and submergence.
- Describe the origin and development of raised beaches and marine platforms.
- Compare the formation and characteristics of rias, fjords, and Dalmatian coasts.
- Outline the evidence for recent and predicted climatic changes affecting sea levels.
- Explain the physical mechanisms by which climate change impacts coastal environments.
- Evaluate the potential socio-economic and environmental impacts of climate change on different coastlines.
- Explain the distinction between individual coastal landforms and broader coastal landscapes.
- Analyse how marine and sub-aerial processes interact over different timescales to shape coastal environments.
- Evaluate the role of time in determining the development and evolution of coastal landscapes.
Coastal landscape development exam tips
Marking Points
- Explain the formation of a wave-cut notch and subsequent cliff retreat leading to a wave-cut platform.
- Describe the sequence of erosion from a fault or joint to a cave, arch, and stack.
- Evaluate the role of specific marine erosion processes, such as hydraulic action and abrasion, in shaping cliff profiles.
- Assess how geological factors, such as lithology and structural dip, influence the rate and morphology of coastal erosion.
- Explain the role of longshore drift in the formation of simple and compound spits, including the development of recurved ends.
- Differentiate between offshore bars, barrier beaches, and barrier islands in terms of their formation and location.
- Describe the process of aeolian transport and vegetation succession in the formation and stabilisation of sand dunes.
- Assess how factors such as sediment supply, wave energy, and coastal configuration influence depositional landforms.
- Explain the role of flocculation in the deposition of fine sediments in low-energy estuarine environments.
- Describe the process of plant succession (halosere) starting with pioneer species like Spartina.
- Identify how vegetation traps further sediment, raising the marsh height and altering the local environment.
- Discuss the influence of physical factors such as tidal range, sediment availability, and sheltered topography on mudflat and saltmarsh development.
- Define eustatic sea-level change as a global change in the volume of water in the oceans or the shape of ocean basins.
- Define isostatic sea-level change as a local or regional change in the level of the land relative to the sea, such as post-glacial rebound.
- Explain how tectonic activity can cause sudden, localised changes in relative sea level through land uplift or subsidence.
- Outline the major sea-level changes over the last 10,000 years, specifically the rapid eustatic rise known as the Flandrian Transgression and subsequent stabilisation.
- Explain the difference between eustatic (global water volume) and isostatic (local land level) changes in creating emergent or submergent coastlines.
- Describe the formation of raised beaches and marine platforms through successive phases of isostatic uplift and wave action.
- Differentiate rias (drowned V-shaped river valleys) from fjords (drowned U-shaped glacial valleys with a threshold lip).
- Explain the formation of Dalmatian coasts through the submergence of concordant coastlines where valleys run parallel to the shore.
- Identify thermal expansion and the melting of land-based ice (glaciers and ice sheets) as the primary drivers of recent eustatic sea-level rise.
- Use quantitative data to describe recent and predicted sea-level changes, such as the current rise of approximately 3.4 mm per year.
- Explain how climate change increases the risk of coastal flooding and accelerates coastal erosion through higher baseline sea levels and more intense storm surges.
- Discuss the socio-economic and environmental impacts on coastal communities, such as the loss of coastal habitats through coastal squeeze and damage to infrastructure.
- Explain how specific marine and sub-aerial processes operate to create distinct coastal landforms.
- Differentiate between short-term temporal scales (e.g., daily tides, seasonal storms) and long-term scales (e.g., eustatic sea-level changes).
- Analyse how individual landforms (e.g., a single stack or spit) aggregate to define the wider coastal landscape (e.g., a discordant coastline).
- Evaluate the concept of dynamic equilibrium, where landscapes adjust to changes in processes over time.
Examiner Tips
- 💡Create a comparative table of one UK and one non-UK coastal landscape, highlighting differences in geology, energy levels, and dominant processes.
- 💡Ensure your non-UK case studies cover different types of coastal environments, such as a low-energy delta and a high-energy rocky coastline.
- 💡Use specific data, such as local erosion rates or tidal ranges, to support your descriptions of international coastal landscapes.
- 💡Use specific, named examples of coastal landforms, such as Old Harry Rocks for a stack, to support your explanations.
- 💡When explaining the cave-arch-stack sequence, ensure you link specific erosional processes to each stage of development.
- 💡Discuss how the width of a wave-cut platform eventually limits further cliff erosion by dissipating wave energy before it reaches the cliff base.
- 💡Clearly distinguish between simple spits and compound spits by mentioning the multiple recurved laterals and complex history of compound spits.
- 💡Use annotated diagrams to illustrate the process of longshore drift and the resulting formation of a tombolo or spit.
- 💡Discuss the concept of sediment cells and how a disruption in sediment supply can alter the development of depositional landforms.
- 💡Use specific examples of pioneer species, such as Spartina or Glasswort, to illustrate the biological processes of saltmarsh development.
- 💡Clearly link the physical process of flocculation to the biological process of succession when explaining landscape evolution.
- 💡Mention associated landscape features like tidal creeks and salt pans to demonstrate a comprehensive understanding of the environment.
- 💡Use the UK as a case study to contrast isostatic rebound in the north (Scotland) with isostatic subsidence in the south (England).
- 💡Refer to the Flandrian Transgression when discussing the rapid eustatic sea-level rise at the start of the Holocene epoch.
- 💡Clearly distinguish between global (eustatic) and local (isostatic/tectonic) impacts on relative sea level in your answers.
- 💡Use specific named examples for each landform, such as the Isle of Arran for raised beaches or the Dalmatian coast in Croatia.
- 💡When explaining fjords, always mention the shallow rock threshold (lip) at the mouth, as this is a key distinguishing feature from rias.
- 💡Clearly link the formation of these landforms to the concepts of eustatic and isostatic sea-level change over geological timescales.
- 💡Quote specific figures from the IPCC regarding recent sea-level rise and future projections to support your arguments.
- 💡Discuss the concept of coastal squeeze where rising sea levels push coastal habitats against fixed artificial defences, leading to habitat loss.
- 💡Evaluate the varying vulnerability of different coastlines, contrasting low-lying islands with steep, rocky coastlines.
- 💡Use specific case studies to illustrate how a combination of processes over time has shaped a named coastal landscape.
- 💡When discussing time, explicitly use terminology such as short-term, long-term, episodic, and continuous to structure your evaluation.
- 💡Link the formation of individual landforms to the broader landscape system, showing how sediment eroded from one area supplies another.
Common Mistakes
- Relying exclusively on UK-based coastal case studies like Holderness or Chesil Beach. Correction: You must include detailed examples of coastal landscapes from outside the UK to meet the specification requirements.
- Treating all international coastlines as having identical processes to the UK. Correction: Acknowledge how different climatic regimes, such as tropical storms or coral reef formation, create unique coastal landscapes not found in the UK.
- Providing vague geographical locations for international examples. Correction: Use specific, named locations, such as the Sundarbans in Bangladesh and India, rather than just referring broadly to a continent.
- Confusing hydraulic action with abrasion. Hydraulic action is the force of water and trapped air compressing in cracks, whereas abrasion involves waves throwing sediment against the cliff.
- Stating that wave-cut platforms are completely flat. Wave-cut platforms typically slope gently towards the sea and are often uneven with rock pools.
- Ignoring sub-aerial processes in cliff development. Always include weathering and mass movement as key factors that work alongside marine erosion to shape cliff profiles.
- Assuming spits only form across river estuaries. Spits can form wherever there is a sudden change in the direction of the coastline, not just at estuaries.
- Using the terms barrier beach and offshore bar interchangeably. Offshore bars are submerged or semi-submerged ridges where waves break, whereas barrier beaches are usually above high tide and enclose a lagoon.
- Forgetting the role of wind in coastal deposition. Explicitly mention aeolian processes when discussing the formation and development of sand dunes.
- Confusing mudflats with saltmarshes; mudflats are the initial unvegetated stage, whereas saltmarshes are vegetated by halophytes.
- Stating that sediment is deposited solely because water stops moving; deposition is significantly enhanced by the chemical process of flocculation in brackish water.
- Assuming saltmarshes are static landscapes; they are dynamic environments constantly evolving through succession and responding to sea-level changes.
- Confusing eustatic and isostatic changes; eustatic is a global change in water volume, whereas isostatic is a local change in land level.
- Stating that sea levels have risen continuously at the same rate for 10,000 years; the rate of rise slowed significantly and stabilised around 3,000 to 4,000 years ago before recent anthropogenic increases.
- Ignoring tectonic sea-level change; tectonic uplift or subsidence must be included as a distinct mechanism that alters relative sea level independently of ice melt.
- Confusing rias and fjords; rias are drowned river valleys with a dendritic profile, whereas fjords are drowned glacial troughs with steep sides and a shallow lip.
- Stating that emergent coastlines are caused solely by sea-level fall; they are usually the result of local isostatic uplift exceeding global eustatic sea-level rise.
- Describing Dalmatian coasts as discordant; they actually form on concordant coastlines where the geological structure runs parallel to the sea.
- Claiming that melting sea ice causes sea-level rise; only the melting of land-based ice and thermal expansion contribute to eustatic rise.
- Confusing weather events with climate change; climate change refers to long-term trends rather than individual, isolated storms.
- Assuming all coasts will be impacted equally; local factors such as isostatic rebound, coastal topography, and existing defences mean impacts vary spatially.
- Confusing landforms with landscapes; correction: a landform is an individual feature (like a cave), whereas a landscape is the broader coastal environment comprising multiple landforms.
- Ignoring the role of time; correction: explicitly state the timescale over which a process operates, distinguishing between instantaneous storm impacts and gradual millennia-long erosion.
- Treating coastal systems as static; correction: describe coasts as dynamic environments constantly adjusting to changing energy inputs and sediment budgets.