Presentation on theme: "Features of EROSION & Features of DEPOSITION"— Presentation transcript:
1Features of EROSION & Features of DEPOSITION RIVERSFeatures of EROSION&Features of DEPOSITION
2River erodes on the outside of the bend of the meander and deposits on the inside of the bend. A Meander in a river
3The river’s speeds around the outside of the bend as it cuts its way; the water is much slower on the inside of the bend where mud and silt etc are dropped or deposited.Deposition
4Features of deposition Beaches spits SeaFeatures of depositionBeachesspits
5Material that is transported by the waves along a coastline is eventually deposited forming distinctive deposition features.The seaCoastal Deposition Landforms: Features and Formation
6These are two main deposition features that you need to learn the formation of. These are: 1. Beaches 2. SpitsSea depositionBeaches and spits
7Features of coastal deposition Beaches Beaches are the main feature of deposition found at the coast, these consist of all the material (sand, shingle etc.) that has built up between the high and low tide mark.Features of coastal depositionThe main feature of coastal deposition is the BEACH
8There are number of different sources of beach material - the main source being rivers, where fine muds and gravels are deposited at the river mouth.Other sources of beach material include longshore drift (bringing material from elsewhere along the coast); constructive waves (bringing material up the beach from the sea) and from cliff erosion.BeachesThe material that makes up a beach comes from…
9As constructive waves build up beaches, they often form ridges in the beach known as berms. The berm highest up the beach represents the extent to which the water has reached during high tide, aka the high water mark.
10Longshore drift moves material along the coastline. A spit forms when the material is deposited (or left behind / dropped).Over time, the spit grows and develops a hook if wind direction changes further out.Waves cannot get past a spit, which creates a sheltered area where silt is deposited and mud flats or salt marshes form.SpitsSpits are long narrow ridges of sand and shingle which project (stick out) from the coastline into the sea.
11This spit is approximately 20 miles long Farewell Spit ,On New Zealand’s South IslandThis spit is approximately 20 miles long
12Features of erosion Headlands Bays Caves Arches Stacks Stumps SeaFeatures of erosionHeadlandsBaysCavesArchesStacksStumps