Discharge measurements: gauging stations accuracy

Autor: Masson, J., Ghio, M., Lallement, Ch., Parsy, C., Philippe, J.
Zdroj: La Houille Blanche; June 1987, Vol. 1987 Issue: 4-5 p333-338, 6p
Abstrakt: Gaging stations data are used in order to establish annual reports of river's discharge. These data are continuous records of water level and intermittent discharge measurements. From them are established stage-discharge curves for a given river. This operation involves a lot of uncertainties. Are explored the ways to fit such curves to the data and to estimate their accuracy in the discharge medium range. The greatest uncertainties arise in the curve 's extrema and with the curves fitting according to artificial or natural and seasonal flow conditions changes. Unfrequent gaging may lead to strong temporarily systematic errors.Les stations de jaugeage servent ? ?laborer les donn?es de d?bits. Au cours de la chaine des op?rations qui aboutissent ? l'?dition d'un annuaire : mesure continue des hauteurs d'eau, mesure des d?bits instantan?s ? l'occasion de jaugeages intermittents, trac? des courbes hauteur-d?bit, le dernier maillon est la source principale des incertitudes. On s'interroge sur la mani?re de tracer la courbe et d'estimer la pr?cision dans sa partie moyenne. Les probl?mes les plus cons?quents concernent les parties extr?mes et le suivi de la courbe face aux variations accidentelles ou saisonni?res des conditions d'?coulement. Des jaugeages peu fr?quents peuvent conduire ? des erreurs syst?matiques importantes temporaires sur la s?rie des d?bits.
Databáze: Supplemental Index