River Dee, Wales
- Created by: anekemayer
- Created on: 26-04-18 18:28
View mindmap
- River Dee, Wales
- How was the River Dee landscape formed?
- The source of the River Dee is Dduallt, an upland area in Snowdonia, North Wales.
- Here annual precipitation is very high.
- The Dee flows south-easterly, eroding this heavily glaciated upland landscape formed of igneous and metamorphic rocks.
- Near Chester the river meanders across a wide floodplain, eroding softer sedimentary rocks and depositing sediment.
- A section is artificially straightened, giving a man-made landscape.
- Further deposition occurs to form the Wirral estuarine landscape.
- Human factors causing change
- 1732-1736- channelisation of 8km improved navigation, increasing discharge and velocity and creating an artificial landscape
- Under the River Dee Regulation Scheme a series of reservoirs was built, e.g. Llyn Celyn
- Earth embankments were built along the middle course to protect agricultural land and properties, preventing further development of the floodplain landscape.
- Physical factors causing change
- If sea levels rise by 1m by the year 2100, coastal landscapes will replace salt-and freshwater marsh landscapes
- Floodplain landscape between Holt and Worthenbury with meanders, alluvium and river terrace deposits formed by active erosion and deposition, causing the river to change its course over time.
- In the Dee Estuary, rises in sea level will destroy the estuary landscape.
- How was the River Dee landscape formed?
Comments
Report