4.2.1 Horizontal flow velocities
Horizontal flow vectors \(\overrightarrow{v}\) at different depths are plotted for high-amplitude (HAT ) and low-amplitude (LAT ) cycles separately (Figure 7c~f). At each measuring station, ebb and flood \(\overrightarrow{v}\) for below-bankfull stages are generally characterized by similar orientations, yet with opposite directions, whereas more scattering is observed when flow depth exceeds the overbank stage. Directions of overbank flows appear to be consistent across different measuring stations, with flood and ebb flows directed to the southwest and southeast, respectively. In contrast, inter-site variability of below-bankfull flows is more marked, as\(\overrightarrow{v}\) appears to follow the orientation of the channel axis, with \(\overrightarrow{v}\) being more variable and generally less correlated to the channel axis orientation for near-bankfull conditions (i.e., water depths 0.8<\(Y\)<1.2m). It is also worthwhile noting that flow directions at any given measuring station display little differences between HAT and LAT cycles, both for water stages above and below the bankfull.