Techniques de leau et calcul des réseaux séance 2a Michel Verbanck 2012.

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1 Techniques de leau et calcul des réseaux séance 2a Michel Verbanck mikeverb@ulb.ac.be 2012

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3 Stream ordering Quantitative way of studying streams. Developed by Horton and then modified by Strahler. Each headwater stream is designated as first order stream When two first order stream combine, they produce second order stream Only when two streams of the same order combine, the stream order increases by one When a lower order stream combines with a higher order stream, the higher order is retained in the combined stream

4 Routing a hillslope hydrograph through the network 1: Rainfall is transformed by the hillslopes into a hydrograph which is delivered throughout the network. 2: Hydrographs from A take longer to travel to the outlet than those from B, and those from C arrive sooner still. 3. When these are combined, the outlet hydrograph is more drawn out, and the peaks from A, B, C do not coincide

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10 0 50000 100000 150000 JanFebMarAvrMaiJunJulAugSepOctNovDec 0 40 80 Débits Q d, m 3 j -1 Précipitations, mm j -1 Répartition des volumes à écouler pendant l´année

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