River Dee, Wales

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  • 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.

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