Fig. 2.

(a) Top view of the trajectory of selfie A2, with LISST-RTSSV sampling locations $\alpha$, $\beta$, and $\gamma$ indicated: $\alpha$ is the intersection of the collector vehicle with the first sediment plume front, $\beta$ is the crossing intersection with the collector vehicle tracks, and $\gamma$ is the intersection of the collector vehicle with the second plume front. The color map in (a) corresponds to the averaged sediment concentration (in mg/L) measured with the four calibrated Seapoint Turbidity Meter (type S) sensors positioned in the vicinity of the LISST-RTSSV at the back of the collector vehicle at 5 m above the seabed. (b) Shows a color plot of the vertical sediment concentration, as a function of time, measured while driving the final selfie segment $l_4$. The vertical dashed lines indicate where data was collected by the LISST-RTSSV. The sediment concentration in (b) is obtained from calibrated STM-S sensors mounted on a pole at the front of the collector vehicle at altitudes of 1 m, 1.6 m, 2 m, 2.5 m, and 3.2 m, as shown in Fig. 8-a. The concentration measurements are linearly interpolated in the vertical direction. The STM-S calibration curves for suspended sediment are given in Fig. S2.