Table 2

Covehithe cliffs: historical recession rates.

RecessionmeasurementsitesCliff recession rates (m a−1)
1884–19051905–19461946–1976Cumulativerecession(m) 1884–1976Long-termrecession rate1884–1976Cumulativerecession(m) 1991–1999Short-termrecession rate1991–1999Medium-termrecession rate1946–1976;1991–19991
A53.85.3419.84.565.87
B4.094.095.59421.284.586.10
C4.683.25.68399.884.356.17
D4.592.37400.694.367.21
E4.41.47.68380.24.137.75
F41.27.4355.23.867.53
G648
  • 1Medium-term recession rate is the cumulative recession over periods 1946–1976 (30 years) and 1991–1999 (8 years) divided by the total number of years (38 years). The short-term recession for Site G was added to each of the other sites A–F to generate the medium-term rate. The recession rates at Sites A–F were determined from comparison of the cliff top positions on different Ordnance Survey map editions (see Lee & Clark 2002 for a discussion of the problems of measuring recession from historical maps). Site G is one of the Environment Agency Sea Defense Management System (SDMS) beach profile survey locations (SWD3). Each year, beach surveys are undertaken in winter and summer.