Hydrology IJozsef Szilagyi, Professor of Hydrology Department of Hydraulic and Water Resources Engineering Budapest University of Technology and Economics

Lecture #9: Erosion, river morphology, river flow

River meanders follow a sine-generated curve: = sin(2s/S)

: deviation angle: max()s: distance along the pathS: total path distance in a wavelength

Depth (%)095Velocity (%)10020

With 2 measurements per vertical the accuracy of flowrate calculations is within 3%, with 1, it becomes 4.3%.

Gauging stations: site must be chosen carefully, the resulting rating curve (h-Q) must be stable in time and be sensitive enough

Typical rating curve:

Q = c(h - a)n n > 1Stage (h)Flowrate (Q)Q = 0a

Lab #7: Flowratecalculation