Sand Dunes
- Created by: alana
- Created on: 06-12-18 17:20
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- Sand dunes
- Optimum conditions
- Large supply of sand
- Flat beach gradient
- Strong prevailing onshore winds - moves sand
- Fine sand particles
- Large area of beach exposed at low tide
- Formation process
- M - Every M - Fancy M - Yellow F - Goose F - Dances
- Sand grains blown inland and transported by saltation (bounces and rolling)
- Sand accumulates and builds upper beach height
- Reduction in wind velocity behind accumulation= more sand deposition
- Marram grass colonises EMBRYO DUNES stabilising further dune migration
- Marram grass = tolerant of very sandy conditions. Stabilises sand movement
- Marram leaves further reduce wind speed and capture blown sand. Decaying plants add humus.
- Adjacent embryo dunes merge to form FOREDUNES
- Microclimate and soil conditions change allowing colonisation by additional species
- Mature YELLOW DUNES are formed. Eventually, GREY DUNES form a long way from sea and are fixed due to cover of vegetation
- Microclimate and soil conditions change allowing colonisation by additional species
- Adjacent embryo dunes merge to form FOREDUNES
- Marram grass colonises EMBRYO DUNES stabilising further dune migration
- Reduction in wind velocity behind accumulation= more sand deposition
- Sand accumulates and builds upper beach height
- Landforms formed by sand deposits when the rate of erosion is smaller than the rate of deposition.
- Optimum conditions
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