UK Physical Landscapes, Coastal Processes, and Coastal Management

Comprehensive vocabulary flashcards covering UK physical landscapes, geological processes, coastal erosion and deposition, management strategies, and the Holderness Coast case study.

Geology

The study of the Earth's physical structure and processes.

Igneous Rock

Rock formed from the cooling of magma to produce interlocking crystals that are resistant to erosion and weathering (e.g., basalt and granite).

Intrusive Rock

Igneous rock formed under the Earth's surface from magma cooling slowly underground (e.g., inside a magma dome), creating rocks such as granite.

Extrusive Rock

Igneous rock formed above the Earth's surface when erupted magma cools rapidly, producing fine-grained rocks such as basalt.

Sediment

Any sized rock or mineral fragment ranging from boulders to fine sand that can be transported by rivers, glaciers, or coastal waves.

Sedimentary Rock

Rock created through the compaction and cementation of sediment clasts and dead organisms on the sea bed, forming distinct layers (beds or bedding planes) and fossils (e.g., chalk and limestone).

Metamorphic Rock

Erosion-resistant rock created when existing igneous or sedimentary rocks are subjected to extreme heat and pressure (e.g., schist, slate, and gneiss).

Tees-Exe Line

An imaginary geological dividing line running from the River Tees (northeast) to the River Exe (southwest), separating harder upland rocks in the northwest from softer lowland sedimentary rocks in the southeast.

Upland Region

An area situated over $250\,\text{m}$ above sea level, typically formed of harder igneous and metamorphic rocks (e.g., Cairngorms and Grampian Mountains with Ben Nevis).

Lowland Region

An area situated below $250\,\text{m}$ above sea level, typically underlain by softer sedimentary rocks (e.g., South Downs and Cotswolds).

Distinctive Landscape

A unique geographic area possessing specific physical and cultural characteristics.

Dip Slope

A long slope with a shallow angle formed of more resistant rock (such as chalk in the South Downs) that eroded slowly.

Scarp Slope

A steep slope opposite a dip slope, formed where less resistant rock (such as clay in the South Downs) was rapidly eroded by glacial meltwaters, often leaving a flat vale at the base.

Tor

An exposed stack of intrusive igneous rock rising above the surrounding landscape (e.g., Bowerman's Nose in Dartmoor).

Clitter Slope

A field of broken rock fragments and debris surrounding the base of a tor, detached by weathering along exposed joints.

Limestone Pavement

An elevated, flat, bare rock surface resembling a cobbled path, exposed when glacial scraping and meltwater erosion stripped away topsoil (e.g., Malham Cove in Yorkshire).

Clints

The raised, flat-topped blocks of limestone that form the surface of a limestone pavement.

Grykes

Deep vertical fissures and cracks separating the clints in a limestone pavement, widened by chemical and freeze-thaw weathering.

Coast

The narrow strip of shoreline separating the land from the sea, where approximately 4 billion people reside globally.

Coastal Recession

The gradual movement backwards of the coastline due to marine and sub-aerial erosion processes.

Coastal Flooding

The temporary or permanent inundation of low-lying coastal land by seawater, triggered by sea level rise, storm surges, or tsunamis.

Freeze-Thaw (Mechanical Weathering)

A physical weathering process in which water collects in cracks, freezes, expands to widen the fissure, and repeats until the rock splits.

Biological Weathering

The weakening and disintegration of coastal bedrock caused by the growth of plant roots or the burrowing of animals.

Chemical Weathering

The breakdown and decomposition of rock when rainwater absorbs carbon dioxide or sulfur dioxide to form weak acids that dissolve minerals (e.g., dissolving limestone).

Mass Movement

The downslope movement of coastal rock, soil, or mud occurring when parts of a cliff face detach and collapse.

Sliding (Landslides)

A coastal mass movement event where an entire planar sheet of cliff material slides rapidly downslope, often triggered by rainfall or seismic activity.

Slumping

A mass movement process occurring after heavy rainfall saturates cliff soil, forming dense mud that flows downward toward the beach.

Rotational Slip

A mass movement process where saturated cliff material slips downslope along a curved slip plane rather than a straight slide plane.

Rockfalls

The rapid dropping of small chunks of rock from a cliff face, frequently initiated by frost shattering (freeze-thaw weathering).

Fetch

The open distance of water over which the wind blows uninterrupted to generate waves; a larger fetch produces higher-energy waves.

Swash

The rush of seawater washing up the beach slope after a wave breaks.

Backwash

The movement of water draining down the beach slope back into the sea under gravity.

Constructive Waves

Low-energy, low-frequency depositional waves with a strong swash and weak backwash that deposit material to form wide, shallow-sloping sandy beaches.

Destructive Waves

High-energy, frequent erosional waves with a weak swash and strong backwash that remove sediment, forming steep, shingle or pebbly beaches.

Hydraulic Action

An erosion process where waves force water and air into cliff cracks, creating explosive pressure that widens fissures until rock collapses.

Abrasion

An erosional process where wave-transported sediment and pebbles scrape against cliff surfaces like sandpaper, scouring away the rock.

Attrition

The grinding and collision of wave-borne rock fragments against each other, causing them to become progressively smaller, smoother, and rounder.

Solution (Corrosion)

The chemical breakdown and disintegration of rock when seawater dissolves soluble minerals within the cliff face.

Concordant Coastline

A coastline where the geology consists of a uniform rock band running parallel to the shore, eroding at a uniform rate and producing straight coastlines or sheltered coves.

Discordant Coastline

A coastline where bands of alternating resistant and less resistant rock meet the sea at right angles, causing differential erosion that produces headlands and bays.

Cove

A circular inlet on a concordant coast formed when waves breach an outer resistant rock layer to rapidly scour out softer rock lying behind it.

Headland

A protruding promontory of resistant rock that withstands coastal erosion and extends out into the sea.

Bay

A sheltered, curved coastal inlet formed between headlands where soft, less resistant rock has been eroded away.

Wave-Cut Notch

A distinct indentation carved into the base of a cliff between the high and low water marks by hydraulic action, abrasion, and solution.

Wave-Cut Platform

A flat, gently sloping expanse of rock exposed at low tide, remaining after unsupported cliffs above an expanding wave-cut notch collapse and retreat landward.

Traction

A coastal transport mechanism where the heaviest and largest boulders roll along the seabed pushed by wave energy.

Saltation

A coastal transport process in which medium-sized sediment particles and small pebbles bounce along the seabed.

Suspension

A sediment transport mechanism where fine particles of silt and clay float freely inside the water column.

Solution (Transport)

The transportation of dissolved chemical minerals carried invisibly within moving seawater.

Longshore Drift

The zig-zag transportation of beach sediment along the coast, where swash drives material onshore at the angle of the prevailing wind and backwash drags it straight down at $90^\circ$.

Spit

An extended depositional ridge of sand or shingle connected to the coast at one end, formed when longshore drift continues past an abrupt change in coastline direction (e.g., an estuary mouth).

Bar

A continuous coastal depositional ridge formed when a spit extends completely across a bay, connecting two headlands and trapping a lagoon behind it.

Hard Engineering

Coastal defense approaches using artificial, solid structures (e.g., sea walls, groynes, rip rap) to block or absorb marine wave energy.

Soft Engineering

Coastal management methods that work with natural coastal processes and habitats to mitigate erosion and flooding without building rigid artificial structures.

Sea Wall

A curved concrete hard engineering barrier placed at the cliff foot to reflect incoming wave energy, lasting up to $50\,\text{years}$ but costing around $\text{£}6000\,\text{per metre}$.

Groyne

A wooden or concrete barrier built perpendicular to the beach to impede longshore drift and trap sand, costing around $\text{£}400\,\text{per metre}$ for a $1\,\text{m}$ high structure.

Terminal Groyne Syndrome

Accelerated erosion occurring downdrift of a groyne field, caused by the structures trapping sediment and starving downstream beaches of sand (e.g., at Mappleton, south of Hornsea).

Rip Rap (Rock Armour)

Massive boulders (often imported from Norway) placed at the base of cliffs to dissipate wave energy within the gaps between rocks.

Managed Retreat

A soft engineering policy where existing sea defenses on low-value land (e.g., farmland) are breached or removed, allowing seawater to create protective, biodiverse saltmarshes.

Beach Nourishment

A soft engineering technique where sand is artificially pumped or trucked onto an eroding beach to build it up, costing approximately $\text{£}6500\,\text{per }100\,\text{m}$.

Holderness Coast

A sedimentary, discordant coastline in northeast England (Hull) recognized as the fastest eroding coastline in Europe due to soft boulder clay cliffs and high-energy destructive waves.

Flamborough Head

A resistant chalk headland on the northern end of the Holderness Coast that withstands marine erosion, forming classic arches, stacks, and wave-cut platforms.

Spurn Head (Spurn Point)

A $6\,\text{km}$ recurved spit located at the mouth of the Humber Estuary, formed by sediment transported southward by longshore drift along the Holderness Coast.