Table 1 Beach characteristics of the four benchmark sites and description of the in situ datasets.

From: Benchmarking satellite-derived shoreline mapping algorithms

Sites

Mean spring tide range (m)

Mean deepwater sig. wave height (m)a

Mean deepwater peak wave period (s)a

Average beach-face slope (tanβ)b

Median grain size (mm)

Start of in situ surveys

Refs.

Duck

1.4

1.1

7.5

0.11 ± 0.03

0.3

1974

32

Narrabeen

1.7

1.4

8.8

0.10 ± 0.03

0.3

1976

4

Torrey Pines

2.3

1.1

13.2

0.04 ± 0.01

0.2

2001

7

Truc Vert

3.2

1.8

10.8

0.05 ± 0.03

0.35

2004

6

  1. aCalculated using wave time-series extracted from the closest grid point of the ERA5 reanalysis (1979–2022).
  2. bAverage beach-face slope between MSL and Mean High Water Spring (MHWS) calculated with a linear regression using the topographic survey data, the standard deviation indicates the temporal variability in beach-face slope.
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