Text S2. Grain-size distribution parameters
Line-by-number counts (Wolman, 1954) of b-axis mobile particles of the
bed (n = 100) were performed at each of the 24 seismic sensor locations.
Particles were partitioned into 10 classes (0.0001 – 0.008 m, 0.008 -
0.038 m, 0.038 – 0.08 m, 0.08 – 0.13 m, 0.13 – 0.192 m, 0.192 – 0.28
m, 0.28 – 0.4 m, 0.4 – 0.55 m, 0.55 – 0.7 m), and a best-fit
raised-log cosine function was fitted to each empirical sample (best of
104 trials), following Tsai et al. (2012). Results of
the best-fit at each seismic sensor location is presented in Figure S2,
and the associated parameters \(D_{50}\) [m] and \(\sigma_{g}\) used
for the seismic inversion are provided in Table S2.