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Measuring water surface topography using laser scanning
ID
Rak, Gašper
(
Avtor
),
ID
Hočevar, Marko
(
Avtor
),
ID
Steinman, Franci
(
Avtor
)
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Izvleček
Measuring the topography of water surfaces with conventional measurement methods is, particularly in the case of turbulent flow with strong vertical and longitudinal dynamics, a very demanding and challenging task. Channel confluences are important elements in river engineering, as they appear in natural and regulated river channels, torrents, as well as in numerous hydraulic structures. At confluences, especially in the case of incoming supercritical flow, turbulent three-dimensional flows occur, and a time-varying structure of waters surface. Laser scanning enables data capture with high spatial and temporal resolution, and this method is widely used nowadays. This article discusses laser scanning as a measurement method for acquiring the agitated shape of a water surface. The application of a commercial two-dimensional LIDAR device for free-water-surface acquisition is presented for two cases. In the first case the measurements were performed in a glass tank where it was possible to determine the precise reference water level. In the second case we used LIDAR with turbulent aerated flow for fluctuating free-water surface measurement. Measurements were taken in the model of supercritical confluence, where the development of standing waves leads to the phenomenon of self-aerated flow. The measurements presented in the paper were conducted for a selected discharge rates and the Froude numbers of the main and side flow channels. Measurement results are shown as surface profiles at several selected locations of confluence. This measurement method has proven to be very promising.
Jezik:
Angleški jezik
Ključne besede:
laser scanning
,
non-contact measurement method
,
turbulent flow
,
aerated flow
,
water surface topography
Tipologija:
1.01 - Izvirni znanstveni članek
Organizacija:
FGG - Fakulteta za gradbeništvo in geodezijo
Leto izida:
2017
Št. strani:
Str. 35-44
Številčenje:
Letn. 56
PID:
20.500.12556/RUL-126479
UDK:
626/627
ISSN pri članku:
0955-5986
DOI:
10.1016/j.flowmeasinst.2017.07.004
COBISS.SI-ID:
8119905
Datum objave v RUL:
23.04.2021
Število ogledov:
1140
Število prenosov:
0
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Objavi na:
Gradivo je del revije
Naslov:
Flow measurement and instrumentation
Skrajšan naslov:
Flow meas. instrum.
Založnik:
Elsevier
ISSN:
0955-5986
COBISS.SI-ID:
169755
Sekundarni jezik
Jezik:
Slovenski jezik
Ključne besede:
lasersko skeniranje
,
nekontaktne merilne metode
,
turbulentni tok
,
ozračeni vodni tok
,
topografija vodne gladine
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