TY  - CHAP
A1  - Crookston, Brian M.
A1  - Bung, Daniel Bernhard
ED  - Ortega-Sánchez, Miguel
T1  - Application of RGB-D cameras in hydraulic laboratory studies
T2  - Proceedings of the 39th IAHR World Congress
N2  - Non-intrusive measuring techniques have attained a lot of interest in relation to both hydraulic modeling and prototype applications. Complimenting acoustic techniques, significant progress has been made for the development of new optical methods. Computer vision techniques can help to extract new information, e. g. high-resolution velocity and depth data, from videos captured with relatively inexpensive, consumer-grade cameras. Depth cameras are sensors providing information on the distance between the camera and observed features. Currently, sensors with different working principles are available. Stereoscopic systems reference physical image features (passive system) from two perspectives; in order to enhance the number of features and improve the results, a sensor may also estimate the disparity from a detected light to its original projection (active stereo system). In the current study, the RGB-D camera Intel RealSense D435, working on such stereo vision principle, is used in different, typical hydraulic modeling applications. All tests have been conducted at the Utah Water Research Laboratory. This paper will demonstrate the performance and limitations of the RGB-D sensor, installed as a single camera and as camera arrays, applied to 1) detect the free surface for highly turbulent, aerated hydraulic jumps, for free-falling jets and for an energy dissipation basin downstream of a labyrinth weir and 2) to monitor local scours upstream and downstream of a Piano Key Weir. It is intended to share the authors’ experiences with respect to camera settings, calibration, lightning conditions and other requirements in order to promote this useful, easily accessible device. Results will be compared to data from classical instrumentation and the literature. It will be shown that even in difficult application, e. g. the detection of a highly turbulent, fluctuating free-surface, the RGB-D sensor may yield similar accuracy as classical, intrusive probes.
Y1  - 2022
SN  - 978-90-832612-1-8
U6  - https://doi.org/10.3850/IAHR-39WC252171192022964
SN  - 2521-7119 (print)
SN  - 2521-716X (online)
N1  - 39th IAHR World Congress, 19. - 24. Juni 2022, Granada
SP  - 5127
EP  - 5133
PB  - International Association for Hydro-Environment Engineering and Research (IAHR)
CY  - Madrid
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
T1  - Observations on non-aerated flow and air entrainment on moderately sloped stepped spillways
T2  - 7th Chinese-German Joint Symposium on Hydraulic and Ocean Engineering : 8. - 12. Sept. 2014, Hannover
Y1  - 2014
N1  - Kennwortgeschützter Zugang. Passwort bei Prof. Bung, Fachbereich Bauingenieurwesen
SP  - 1
EP  - 8
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Oertel, Mario
T1  - Manipulation of non-aerated cavity flow on a stepped spillway model
T2  - 3rd European IAHR Congress : April 14 – 16, 2014, Porto
Y1  - 2014
PB  - Univ. of Porto
CY  - Porto
ER  - 
TY  - CHAP
A1  - Uibel, Thomas
A1  - Blaß, Hans Joachim
T1  - A new method to determine suitable spacings and distances for self-tapping screws
T2  - Meeting ... / International Council for Research and Innovation in Building and Construction, Working Commission W18 - Timber Structures
N2  - The determination of spacing, edge and end distance requirements for self-tapping screws requires numerous and comprehensive insertion tests. Yet the results of such tests cannot be transferred to other types of screws or even to screws of different diameter because of differences in shape or geometry. To reduce the effort of insertion tests a new method was developed which allows the estimation of required spacings, distances and timber thickness.
Y1  - 2010
SN  - 1864-1784
N1  - Paper 43-21-2
VL  - 43
PB  - Lehrstuhl für Ingenieurholzbau und Baukonstruktionen
CY  - Karlsruhe
ER  -