Large Scale Particle Image Velocimetry: Measuring urban runoff

Abstract

Measuring velocities and discharge in the field is well established hydrologic discipline essential for observing and studying the hydrological processes. Small discharges formed on urban areas during rain events are usually low-depth surface flows very difficult to measure with standard devices and procedures. New method, Large Scale Particle Image Velocimetry (LSPIV), based on image processing, is introduced in hydrological practice in recent years as non invasive method for measuring surface velocity in free surface streams. In this article Large Scale Particle Image Velocimetry is applied in the field measurement of an urban discharge during a moderate storm event in Belgrade. .

Terenska merenja brzina i protoka je široko rasprostranjena i poznata hidrološka disciplina neophodna za osmatranje i proučavanje hidroloških procesa. Mali oticaji koji se formiraju u urbanim područjima za vreme i nakon kišnih epizoda obično su sa malim dubinama što otežava njihovo određivanje tradicionalnim metodama i uređajima. Nova metoda, Large Scale Particle Image Velocimetry (LSPIV), bazirana na procesiranju slike, je uvedena u hidrološku praksu poslednjih godina kao neinvazivna metoda koja se upotrebljava kod određivanja polja površinskih brzina otvorenih tokova. U ovom radu LSPIV je primenjena na terenskom merenju urbanog oticaja u rigoli za vreme jedne umerene kišne epizode u Beogradu. .