Tributary bay oscillations generated by diurnal discharge regulation in Three Gorges Reservoir

The dataset include absolute water level (in m.a.s.l.) from six gauging stations along Three Gorges Reservoir and discharge data for the period January to November 2018. And the relative water level and vertical profiles of flow velocity were measured in the middle (Xiakou) and upper reach (Pingyikou) of Xiangxi bay by two RDI ADCP from September 16 - October 12, 2018. For water level, water depth and flow velocity, the respective time series were high-pass filtered with cut-off frequencies corresponding to periods of 36 h and 4 h (see excel files), respectively (half-power frequencies of a zero-phase, 20-pole Butterworth filter). Power spectra were calculated using Welch’s method. Horizontal current velocities were measured in earth coordinates and rotated into longitudinal (along the river channel) and transversal velocity components by rotation into the respective mean (depth and temporarily averaged) flow direction at the sampling sites (see 'long_trans_vel.mat').