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Measure V (current-meter) at 0.2 and 0.8 of depth Average V and multiply by (width * depth)

Stream Cross-Section for Q. Measure V (current-meter) at 0.2 and 0.8 of depth Average V and multiply by (width * depth) Sum up across stream to get total Q = S (V i D i W i ).

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Measure V (current-meter) at 0.2 and 0.8 of depth Average V and multiply by (width * depth)

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  1. Stream Cross-Section for Q • Measure V (current-meter) at 0.2 and 0.8 of depth • Average V and multiply by (width * depth) • Sum up across stream to get total Q = S (Vi Di Wi)

  2. Rating curve hysteresis loop in Zenne river (Lot), 15-16 July 2012 event: blue triangles – rising stage, green squares – falling stage

  3. .

  4. Flume tests carefully conducted by Nomicos (1957) at CalTech: constant-depth, unique sediment size d=0.152mm difficult to reconcile with the standard formulation for the ‘alluvial resistance coefficient’:

  5. Discontinuity rating curve Modified discontinuity rating curve original discontinuity rating curve

  6. 2 5 BF type : 6 3 7 4 transition 8

  7. Bed-material discharge Buoyancy-affected turbulence Bed morphology adaptation Alluvial resistance

  8. Verbanck, JHR 2008 Mao, IJSR 2003

  9. attached-detached flow model

  10. If lBF is the wavelength from crest to crest, the celerity of the associated gravity wave is given by Airy’s law:

  11. Facteur m m = 1,1 m = 1,2

  12. Zenne stream velocity (m/s) Lot gauging station – July 2012 n = 4 n = 5

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