4.1.5 In-situ Controls on Headwall Retreat Rates
From the analysis thus far, it appears that two factors are the most
important in promoting the fastest rates of HWR on Peninsula Point
between 2016 and 2018 – a mean OT below 4 m and the presence of ice
inland of the headwall, regardless of its thickness or the proportion of
the headwall for which it accounted. When both criteria are met, the
average HWR rate is 20.4 m a-1, while all other
headwalls retreat at an average of 9.5 m a-1 (Figure
7).