Sammanfattning

The flow characteristics in the vicinity of a set of half-cylinders of different sizes simulating benthic objects were studied experimentally using particle image velocimetry (PIV). The cylinders were mounted on the bottom of an open channel, and the influence of the flow speed on the distribution of the shear stress along the bottom geometry was investigated. Of special interest was how the shear stress changes close to the wall as a function of the flow speed and cylinder arrangement. It was found that the shear stress varies significantly as a function of position. This implies habitat heterogeneity allowing benthic invertebrates with different shear stress tolerance exists when the bottom consists of differently sized stones. It was also shown that direct measurements of near wall velocity gradients are necessary to accurately calculate the wall shear stress for more complex geometries.

Nyckelord

shear stress; PIV; benthic fauna; river; stones

Publicerad i

Water
2019, Volym: 11, nummer: 4, artikelnummer: 650
Utgivare: MDPI

SLU författare

• Leonardsson, Kjell

  • Institutionen för vilt, fisk och miljö, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Oceanografi, hydrologi, vattenresurser
Fisk- och akvakulturforskning


Publikationens identifierare

DOI: https://doi.org/10.3390/w11040650

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/101013