BEACH PROFILES 2000-2018
Road name locations are given for approximate reference. Chainage (distance from the promenade wall) is 1000 metres.
X-axis levels relate to Ordnance Datum, (OD, at Newlyn) which is 4.93 metres below Hilbre chart datum, so the (almost) 4 metre MHWS (mean high water spring tide; where there is the greatest difference between high and low tide) level on the x axis represents an actual near 9 metre MHWS tide locally. MHWN is neap tide (the smallest change between low and high tide). Note how far the MHSW tide is retreating.
At profiles 78-79 – Trinity Road to the old lifeboat station – the MHSW is retreating by up to 75 metres per decade as a result of upper beach accretion.
However, beyond 500 metres chainage from Kings Gap to the new lifeboat station and beyond 850 metres chainage out from Red Rocks, the levels are lowering, whereas accretion is particularly dramatic between 500 metres and 800 metres chainage between Red Rocks and Coronation Road.
Isn't it about time we make a real effort to gain a better understanding of how this is impacting on sediment type, sediment distribution, beach levels, types of vegetation and the impact of accretion on wave energy on the upper beach?