TY  - JOUR
A1  - Valero, Daniel
A1  - Bung, Daniel Bernhard
T1  - Artificial Neural Networks and pattern recognition for air-water flow velocity estimation using a single-tip optical fibre probe
JF  - Journal of Hydro-environment Research
Y1  - 2017
U6  - https://doi.org/10.1016/j.jher.2017.08.004
SN  - 1570-6443
VL  - 19
IS  - 3
SP  - 150
EP  - 159
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Valero, Daniel
ED  - Dewals, Benjamin
T1  - Image processing techniques for velocity estimation in highly aerated flows: bubble image velocimetry vs. optical flow
T2  - Sustainable Hydraulics in the Era of Global Change : Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016)
Y1  - 2016
SN  - 978-1-138-02977-4
SN  - 978-1-4987-8149-7 (eBook)
U6  - https://doi.org/10.1201/b21902-31
SP  - 151
EP  - 157
PB  - CRC Press
ER  - 
TY  - CHAP
A1  - Oertel, M.
A1  - Bung, Daniel Bernhard
ED  - Crookston, B.
ED  - Tullis, B.
T1  - Scouring processes downstream a crossbar block ramp
BT  - Session 3: Scour, erosion, sedimentation
T2  - Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures, Portland, OR, 27-30 June 2016
Y1  - 2016
SN  - 978-1-884575-75-4
U6  - https://doi.org/10.15142/T3340628160853
SP  - 549
EP  - 559
ER  - 
TY  - JOUR
A1  - Valero, Daniel
A1  - Schalko, Isabella
A1  - Friedrich, Heide
A1  - Abad, Jorge D.
A1  - Bung, Daniel Bernhard
A1  - Donchyts, Gennadii
A1  - Felder, Stefan
A1  - Ferreira, Rui M. L.
A1  - Hohermuth, Benjamin
A1  - Kramer, Matthias
A1  - Li, Danxun
A1  - Mendes, Luis
A1  - Moreno-Rodenas, Antonio
A1  - Nones, Michael
A1  - Paron, Paolo
A1  - Ruiz-Villanueva, Virginia
A1  - Wang, Ruo-Qian
A1  - Franca, Mario J.
T1  - Pathways towards democratization of hydro-environment observations and data
JF  - Iahr White Paper Series
Y1  - 2021
IS  - 1
SP  - 1
EP  - 9
PB  - International Association for Hydro-Environment Engineering and Research (IAHR)
ER  - 
TY  - JOUR
A1  - von Häfen, Hajo
A1  - Krautwald, Clemens
A1  - Stolle, Jacob
A1  - Bung, Daniel Bernhard
A1  - Goseberg, Nils
T1  - Overland flow of broken solitary waves over a two-dimensional coastal plane
JF  - Coastal Engineering
N2  - Landslides, rock falls or related subaerial and subaqueous mass slides can generate devastating impulse waves in adjacent waterbodies. Such waves can occur in lakes and fjords, or due to glacier calving in bays or at steep ocean coastlines. Infrastructure and residential houses along coastlines of those waterbodies are often situated on low elevation terrain, and are potentially at risk from inundation. Impulse waves, running up a uniform slope and generating an overland flow over an initially dry adjacent horizontal plane, represent a frequently found scenario, which needs to be better understood for disaster planning and mitigation. This study presents a novel set of large-scale flume test focusing on solitary waves propagating over a 1:14.5 slope and breaking onto a horizontal section. Examining the characteristics of overland flow, this study gives, for the first time, insight into the fundamental process of overland flow of a broken solitary wave: its shape and celerity, as well as its momentum when wave breaking has taken place beforehand.
KW  - Landslide tsunamis
KW  - Hazard assessment
KW  - Large scale tests
KW  - Overland flow
KW  - Solitary waves
Y1  - 2022
U6  - https://doi.org/10.1016/j.coastaleng.2022.104125
SN  - 1872-7379
VL  - 175
IS  - August
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Vogel, Jochen
A1  - Schmidt, Daniel
A1  - Bung, Daniel Bernhard
T1  - Three-dimensional flow structure inside the cavity of a non-aerated stepped chute
T2  - 7th IAHR International Symposium on Hydraulic Structures, Aachen, Germany, 15-18 May
Y1  - 2018
SN  - 978-0-692-13277-7
U6  - https://doi.org/10.15142/T3GH17
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Hildebrandt, Arndt
A1  - Oertel, Mario
A1  - Schlenkhoff, Andreas
A1  - Schlurmann, Torsten
ED  - McKee Smith, Jane
T1  - Bore propagation over a submerged horizontal plate by physical and numerical simulation
T2  - Coastal engineering 2008 : proceedings of the 31st international conference; Hamburg, Germany, 31 August - 5 September 2008 ; Vol. 4
Y1  - 2008
SN  - 9814277401 ; 9789814277402
SP  - 3542
EP  - 3553
ER  - 
TY  - JOUR
A1  - Valero, Daniel
A1  - Chanson, Hubert
A1  - Bung, Daniel Bernhard
T1  - Robust estimators for free surface turbulence characterization: A stepped spillway application
JF  - Flow Measurement and Instrumentation
N2  - Robust estimators are parameters insensitive to the presence of outliers. However, they presume the shape of the variables’ probability density function. This study exemplifies the sensitivity of turbulent quantities to the use of classic and robust estimators and the presence of outliers in turbulent flow depth time series. A wide range of turbulence quantities was analysed based upon a stepped spillway case study, using flow depths sampled with Acoustic Displacement Meters as the flow variable of interest. The studied parameters include: the expected free surface level, the expected fluctuation intensity, the depth skewness, the autocorrelation timescales, the vertical velocity fluctuation intensity, the perturbations celerity and the one-dimensional free surface turbulence spectrum. Three levels of filtering were utilised prior to applying classic and robust estimators, showing that comparable robustness can be obtained either using classic estimators together with an intermediate filtering technique or using robust estimators instead, without any filtering technique.
Y1  - 2020
U6  - https://doi.org/10.1016/j.flowmeasinst.2020.101809
SN  - 0955-5986
VL  - 76
IS  - Art. 101809
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Valero, D.
A1  - Bung, Daniel Bernhard
A1  - Crookston, B. M.
T1  - Closure to “Energy Dissipation of a Type III Basin under Design and Adverse Conditions for Stepped and Smooth Spillways”
JF  - Journal of Hydraulic Engineering
Y1  - 2019
U6  - https://doi.org/10.1061/(ASCE)HY.1943-7900.0001669
VL  - 146
IS  - 2
PB  - ASCE
CY  - Reston, Va.
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Bung, Daniel Bernhard
A1  - Oertel, M.
ED  - Dewals, Benjamin
T1  - Turbulent dispersion in bounded horizontal jets : RANS capabilities and physical modeling comparison
T2  - Sustainable Hydraulics in the Era of Global Change : Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016)
Y1  - 2016
SN  - 978-1-138-02977-4
SN  - 978-1-4987-8149-7 (eBook)
U6  - https://doi.org/10.1201/b21902-13
SP  - 49
EP  - 55
PB  - CRC Press
ER  - 
TY  - JOUR
A1  - Lopes, Pedro
A1  - Leandro, Jorge
A1  - Carvalho, Rita F.
A1  - Bung, Daniel Bernhard
T1  - Alternating skimming flow over a stepped spillway
JF  - Environmental Fluid Mechanics
Y1  - 2017
U6  - https://doi.org/10.1007/s10652-016-9484-x
SN  - 1573-1510
VL  - 17
IS  - 2
SP  - 303
EP  - 322
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Bung, Daniel Bernhard
T1  - Interfacial velocity estimation in highly aerated stepped spillway flows with a single tip fibre optical probe and Artificial Neural Networks
T2  - 6th IAHR International Junior Researcher and Engineer Workshop on Hydraulic Structures, May 30th to June 1st 2016. Lübeck, Germany
N2  - Air-water flows can be found in different engineering applications: from nuclear engineering to huge hydraulic structures. In this paper, a single tip fibre optical probe has been used to record high frequency (over 1 MHz) phase functions at different locations of a stepped spillway. These phase functions have been related to the interfacial velocities by means of Artificial Neural Networks (ANN) and the measurements of a classical double tip conductivity probe. Special attention has been put to the input selection and the ANN dimensions. Finally, ANN have shown to be able to link the signal rising times and plateau shapes to the air-water interfacial velocity.
Y1  - 2016
U6  - https://doi.org/10.15142/T3Q590
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Kramer, Matthias
A1  - Bung, Daniel Bernhard
A1  - Chanson, Hubert
T1  - A stochastic bubble generator for air-water flow research
T2  - E-proceedings of the 38th IAHR World Congress, September 1-6, 2019, Panama City, Panama
Y1  - 2019
U6  - https://doi.org/10.3850/38WC092019-0909
SP  - 5714
EP  - 5721
ER  - 
TY  - CHAP
A1  - Kerpen, N. B.
A1  - Bung, Daniel Bernhard
A1  - Schlurmann, Torsten
ED  - Janssen, Robert
T1  - Physical model investigations of ships passing through a lock
T2  - Hydraulic structures: useful water harvesting systems or relics? : Third International Junior Researcher and Engineer Workshop on Hydraulic Structures (IJREWHS'10) : Edinburgh, Scotland, U.K., 2-3 May 2010
Y1  - 2010
SN  - 9781742720159
SP  - 93
EP  - 100
PB  - School of Civil Engineeering, The University of Queensland
CY  - Brisbane
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
T1  - Non-intrusive measuring of air-water flow properties in self-aerated stepped spillway flow
T2  - Balance and uncertainty - water in a changing world :  proceedings of the 34th IAHR world congress ; 33rd Hydrology and Water Resources Symposium ; 10th Conference on Hydraulics in Water Engineering ; 26 June - 1 July 2011, Brisbane, Australia
Y1  - 2011
SN  - 978-0-85825-868-6
SP  - 2380
EP  - 2387
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Schlenkhoff, Andreas
ED  - Pagliara, Stefano
T1  - Optimization of the reaeration potential on embankment stepped spillways in skimming flow regime
T2  - Hydraulic structures : proceedings of the second International Junior Researcher and Engineer Workshop on Hydraulic Structures, Pisa, Italy, 30 July-1 August 2008
Y1  - 2008
SN  - 978-88-8492-568-8
SP  - 97
EP  - 106
ER  - 
TY  - CHAP
A1  - Schlenkhoff, Andreas
A1  - Bung, Daniel Bernhard
T1  - Prediction of oxygen transfer in self-aerated skimming flow on embankment stepped spillways
T2  - Water engineering for sustainable environment : 33rd IAHR congress ; 9 - 14 August 2009, Vancouver, British Columbia, Canada
Y1  - 2009
SN  - 9789078046080
SP  - 1 CD-ROM
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Schlenkhoff, Andreas
A1  - Oertel, M.
T1  - Self-aerated skimming flow on embankment stepped spillways
T2  - Water engineering for sustainable environment : 33rd IAHR congress ; 9 - 14 August 2009, Vancouver, British Columbia, Canada
Y1  - 2009
SN  - 9789078046080
SP  - 1 CD-ROM
ER  - 
TY  - CHAP
A1  - Oertel, M.
A1  - Bung, Daniel Bernhard
A1  - Schlenkhoff, Andreas
T1  - Flash flood awareness and prevention
T2  - Water engineering for sustainable environment : 33rd IAHR congress ; 9 - 14 August 2009, Vancouver, British Columbia, Canada
Y1  - 2009
SN  - 9789078046080
SP  - 1 CD-ROM
ER  - 
TY  - JOUR
A1  - Valero, Daniel
A1  - Bung, Daniel Bernhard
T1  - Sensitivity of turbulent Schmidt number and turbulence model to simulations of jets in crossflow
JF  - Environmental Modelling and Software
N2  - Environmental discharges have been traditionally designed by means of cost-intensive and time-consuming experimental studies. Some extensively validated models based on an integral approach have been often employed for water quality problems, as recommended by USEPA (i.e.: CORMIX). In this study, FLOW-3D is employed for a full 3D RANS modelling of two turbulent jet-to-crossflow cases, including free surface jet impingement. Results are compared to both physical modelling and CORMIX to better assess model performance. Turbulence measurements have been collected for a better understanding of turbulent diffusion's parameter sensitivity. Although both studied models are generally able to reproduce jet trajectory, jet separation downstream of the impingement has been reproduced only by RANS modelling. Additionally, concentrations are better reproduced by FLOW-3D when the proper turbulent Schmidt number is used. This study provides a recommendation on the selection of the turbulence model and the turbulent Schmidt number for future outfall structures design studies.
Y1  - 2016
U6  - https://doi.org/10.1016/j.envsoft.2016.04.030
SN  - 1364-8152 (electronic)
VL  - 82
SP  - 218
EP  - 228
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Sun, Q.
A1  - Meireles, I.
A1  - Matos, J.
A1  - Viseu, T.
T1  - USBR type III stilling basin performance for steep stepped spillways
T2  - Hydraulic structures into the 21st century : 4th IAHR International Symposium on Hydraulic Structures : 9.-11.2.2012, Porto
Y1  - 2012
SN  - 978-989-8509-01-7
ER  - 
TY  - CHAP
A1  - Kerpen, N. B.
A1  - Bung, Daniel Bernhard
A1  - Schlurmann, Torsten
T1  - Physical model investigations of pressure distributions next to ships passing through a lock
T2  - 5th Chinese-German Joint Symposium on Hydraulic and Ocean Engineering : CG JOINT 2010
Y1  - 2010
SN  - 978-7-5618-3671-2
SP  - 514
EP  - 519
PB  - Univ. Press
CY  - Tianjin
ER  - 
TY  - CHAP
A1  - Gogolin, C.
A1  - Carvalho, R.
A1  - Bung, Daniel Bernhard
A1  - Matos, J.
T1  - Experimental and numerical investigation of steady and unsteady flows in roughened channels with cross beams
T2  - 35th IAHR world congress : 8.-13.9.2013, Chengdu, China
Y1  - 2013
SP  - Artikelkennnummer: A10837C
PB  - Tsinghua Univ. Press
CY  - Beijing
ER  - 
TY  - CHAP
A1  - Oertel, Mario
A1  - Bung, Daniel Bernhard
T1  - Characteristics of cross-bar block ramp flows
T2  - Hydraulic structures into the 21st century : 4th IAHR International Symposium on Hydraulic Structures : 9.-11.2.2012, Porto
Y1  - 2012
SN  - 978-989-8509-01-7
ER  - 
TY  - CHAP
A1  - Schlurmann, Torsten
A1  - Bung, Daniel Bernhard
T1  - Experimental investigation of flow-induced radial gate vibrations at Lower Subansiri dam
T2  - Sixth Chinese-German Joint Symposium on Hydraulic and Ocean Engineering : JOINT 2012 : 23.-29.9.2012, Keelung
Y1  - 2012
SP  - 7
EP  - 14
ER  - 
TY  - CHAP
A1  - Oertel, Mario
A1  - Bung, Daniel Bernhard
T1  - Comparison of 2D dam-break waves with VOF and SPH method
T2  - Proceedings of the 35th IAHR world congress : 8.-13.9.2013, Chengdu, China
Y1  - 2013
SP  - Artikelkennnummer: A11113
PB  - Tsinghua Univ. Press
CY  - Beijing
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
T1  - Air-water surface roughness in self-aerated stepped spillway flows
T2  - 35th IAHR world congress : 8.-13.9.2013, Chengdu, China
Y1  - 2013
SP  - Artikelkennnummer: A11045
PB  - Tsinghua Univ. Press
CY  - Beijing
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Oertel, Mario
T1  - Wave breaking over a submerged horizontal plate: Optical Flow, LES and RANS
T2  - E-proceedings of the 38th IAHR World Congress  September 1-6, 2019, Panama City, Panama
Y1  - 2019
U6  - https://doi.org/10.3850/38WC092019-0509
SP  - 3690
EP  - 3698
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Tullis, Blake
T1  - Hydraulic Structures - ISHS2018 in Perspective
T2  - 7th IAHR International Symposium on Hydraulic Structures, Aachen, Germany, 15-18 May
Y1  - 2018
SN  - 978-0-692-13277-7
U6  - https://doi.org/10.15142/T3WH2B
ER  - 
TY  - JOUR
A1  - Valero, Daniel
A1  - Bung, Daniel Bernhard
A1  - Crookston, B.M.
T1  - Energy dissipation of a Type III basin under design and adverse conditions for stepped and smooth spillways
JF  - Journal of Hydraulic Engineering
N2  - New information regarding the influence of a stepped chute on the hydraulic performance of the United States Bureau of Reclamation (Reclamation) Type III hydraulic jump stilling basin is presented for design (steady) and adverse (decreasing tailwater) conditions. Using published experimental data and computational fluid dynamics (CFD) models, this paper presents a detailed comparison between smooth-chute and stepped-chute configurations for chute slopes of 0.8H:1V and 4H:1V and Froude numbers (F) ranging from 3.1 to 9.5 for a Type III basin designed for F = 8. For both stepped and smooth chutes, the relative role of each basin element was quantified, up to the most hydraulic extreme case of jump sweep-out. It was found that, relative to a smooth chute, the turbulence generated by a stepped chute causes a higher maximum velocity decay within the stilling basin, which represents an enhancement of the Type III basin’s performance but also a change in the relative role of the basin elements. Results provide insight into the ability of the CFD models [unsteady Reynolds-averaged Navier-Stokes (RANS) equations with renormalization group (RNG) k-ϵ turbulence model and volume-of-fluid (VOF) for free surface tracking] to predict the transient basin flow structure and velocity profiles. Type III basins can perform adequately with a stepped chute despite the effects steps have on the relative role of each basin element. It is concluded that the classic Type III basin design, based upon methodology by reclamation specific to smooth chutes, can be hydraulically improved for the case of stepped chutes for design and adverse flow conditions using the information presented herein.
Y1  - 2018
U6  - https://doi.org/10.1061/(ASCE)HY.1943-7900.0001482
SN  - 0733-9429
N1  - Article number 04018036
VL  - 144
IS  - 7
PB  - ASCE
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Valero, Daniel
A1  - Bung, Daniel Bernhard
T1  - Vectrino profiler spatial filtering for shear flows based on the mean velocity gradient equation
JF  - Journal of Hydraulic Engineering
N2  - A new methodology is proposed to spatially filter acoustic Doppler velocimetry data from a Vectrino profiler based on the differential mean velocity equation. Lower and upper bounds are formulated in terms of physically based flow constraints. Practical implementation is discussed, and its application is tested against data gathered from an open-channel flow over a stepped macroroughness surface. The method has proven to detect outliers occurring all over the distance range sampled by the Vectrino profiler and has shown to remain applicable out of the region of validity of the velocity gradient equation. Finally, a statistical analysis suggests that physically obtained bounds are asymptotically representative.
Y1  - 2018
U6  - https://doi.org/10.1061/(ASCE)HY.1943-7900.0001485
SN  - 0733-9429
N1  - Article number 04018037
VL  - 144
IS  - 7
PB  - ASCE
CY  - Reston, Va.
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
ED  - Rowinski, Pawel
T1  - Laboratory models of free-surface flows
T2  - Rivers - physical, fluvial and environmental processes
N2  - Hydraulic modeling is the classical approach to investigate and describe complex fluid motion. Many empirical formulas in the literature used for the hydraulic design of river training measures and structures have been developed using experimental data from the laboratory. Although computer capacities have increased to a high level which allows to run complex numerical simulations on standard workstation nowadays, non-standard design of structures may still raise the need to perform physical model investigations. These investigations deliver insight into details of flow patterns and the effect of varying boundary conditions. Data from hydraulic model tests may be used for calibration of numerical models as well. As the field of hydraulic modeling is very complex, this chapter intends to give a short overview on capacities and limits of hydraulic modeling in regard to river flows and hydraulic structures only. The reader shall get a first idea of modeling principles and basic considerations. More detailed information can be found in the references.
KW  - Physical modeling
KW  - Similitude
KW  - Open channels
KW  - Hydraulic structures
Y1  - 2015
SN  - 978-3-319-17718-2 ; 978-3-319-17719-9
U6  - https://doi.org/10.1007/978-3-319-17719-9_9
SP  - 213
EP  - 228
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Bung, Daniel Bernhard
T1  - Hybrid investigation of air transport processes in moderately sloped stepped spillway flows
T2  - E-proceedings of the 36th IAHR World Congress 28 June – 3 July, 2015, The Hague, the Netherlands
Y1  - 2015
SP  - 1
EP  - 10
ER  - 
TY  - CHAP
A1  - Chanson, Hubert
A1  - Bung, Daniel Bernhard
A1  - Matos, J.
T1  - Stepped spillways and cascades
T2  - Energy dissipation in hydraulic structures / Hubert Chanson (ed.)
Y1  - 2015
SN  - 978-1-138-02755-8 (print) ; 978-1-315-68029-3 (e-Book)
SP  - 45
EP  - 64
PB  - CRC Press
CY  - Boca Raton, Fla. [u.a.]
ER  - 
TY  - CHAP
A1  - Oertel, Mario
A1  - Balmes, Jan P.
A1  - Bung, Daniel Bernhard
T1  - Numerical simulation of erosion processes on crossbar block ramps
T2  - E-proceedings of the 36th IAHR World Congress 28 June – 3 July, 2015, The Hague, the Netherlands
Y1  - 2015
SP  - 1
EP  - 8
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
A1  - Valero, Daniel
T1  - Image processing for bubble image velocimetry in self-aerated flows
T2  - E-proceedings of the 36th IAHR World Congress 28 June – 3 July, 2015, The Hague, the Netherlands
Y1  - 2015
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  - Mohan, Nijanthan
A1  - Groß, Rolf Fritz
A1  - Menzel, Karsten
A1  - Theis, Fabian
T1  - Opportunities and Challenges in the Implementation of Building Information Modeling for Prefabrication of Heating, Ventilation and Air Conditioning Systems in Small and Medium-Sized Contracting Companies in Germany – A Case Study
T2  - WIT Transactions on The Built Environment, Vol. 205
N2  - Even though BIM (Building Information Modelling) is successfully implemented in most of the world, it is still in the early stages in Germany, since the stakeholders are sceptical of its reliability and efficiency. The purpose of this paper is to analyse the opportunities and obstacles to implementing BIM for prefabrication. Among all other advantages of BIM, prefabrication is chosen for this paper because it plays a vital role in creating an impact on the time and cost factors of a construction project. The project stakeholders and participants can explicitly observe the positive impact of prefabrication, which enables the breakthrough of the scepticism factor among the small-scale construction companies. The analysis consists of the development of a process workflow for implementing prefabrication in building construction followed by a practical approach, which was executed with two case studies. It was planned in such a way that, the first case study gives a first-hand experience for the workers at the site on the BIM model so that they can make much use of the created BIM model, which is a better representation compared to the traditional 2D plan. The main aim of the first case study is to create a belief in the implementation of BIM Models, which was succeeded by the execution of offshore prefabrication in the second case study. Based on the case studies, the time analysis was made and it is inferred that the implementation of BIM for prefabrication can reduce construction time, ensures minimal wastes, better accuracy, less problem-solving at the construction site. It was observed that this process requires more planning time, better communication between different disciplines, which was the major obstacle for successful implementation. This paper was carried out from the perspective of small and medium-sized mechanical contracting companies for the private building sector in Germany.
KW  - building information modelling
KW  - HVAC
KW  - prefabrication
KW  - construction
KW  - small and medium scaled companies
Y1  - 2021
U6  - https://doi.org/10.2495/BIM210101
SN  - 1743-3509
N1  - 4th International Conference on Building Information Modelling (BIM) in Design, Construction and Operations, 1–3 September 2021. Santiago de Compostela, Spain
SP  - 117
EP  - 126
PB  - WIT Press
CY  - Southampton
ER  - 
TY  - CHAP
A1  - Langohr, Philipp
A1  - Bung, Daniel Bernhard
A1  - Crookston, Brian M.
ED  - Ortega-Sánchez, Miguel
T1  - Hybrid investigation of labyrinth weirs: Discharge capacity and energy dissipation
T2  - Proceedings of the 39th IAHR World Congress
N2  - The replacement of existing spillway crests or gates with labyrinth weirs is a proven techno-economical means to increase the discharge capacity when rehabilitating existing structures. However, additional information is needed regarding energy dissipation of such weirs, since due to the folded weir crest, a three-dimensional flow field is generated, yielding more complex overflow and energy dissipation processes. In this study, CFD simulations of labyrinth weirs were conducted 1) to analyze the discharge coefficients for different discharges to compare the Cd values to literature data and 2) to analyze and improve energy dissipation downstream of the structure. All tests were performed for a structure at laboratory scale with a height of approx. P = 30.5 cm, a ratio of the total crest length to the total width of 4.7, a sidewall angle of 10° and a quarter-round weir crest shape. Tested headwater ratios were 0.089 ≤ HT/P ≤ 0.817. For numerical simulations, FLOW-3D Hydro was employed, solving the RANS equations with use of finite-volume method and RNG k-ε turbulence closure. In terms of discharge capacity, results were compared to data from physical model tests performed at the Utah Water Research Laboratory (Utah State University), emphasizing higher discharge coefficients from CFD than from the physical model. For upstream heads, some discrepancy in the range of ± 1 cm between literature, CFD and physical model tests was identified with a discussion regarding differences included in the manuscript. For downstream energy dissipation, variable tailwater depths were considered to analyze the formation and sweep-out of a hydraulic jump. It was found that even for high discharges, relatively low downstream Froude numbers were obtained due to high energy dissipation involved by the three-dimensional flow between the sidewalls. The effects of some additional energy dissipation devices, e.g. baffle blocks or end sills, were also analyzed. End sills were found to be non-effective. However, baffle blocks with different locations may improve energy dissipation downstream of labyrinth weirs.
Y1  - 2022
SN  - 978-90-832612-1-8
U6  - https://doi.org/10.3850/IAHR-39WC252171192022738
SN  - 2521-7119 (print)
SN  - 2521-716X (online)
N1  - 39th IAHR World Congress, 19. - 24. Juni 2022, Granada
SP  - 2313
EP  - 2318
PB  - International Association for Hydro-Environment Engineering and Research (IAHR)
CY  - Madrid
ER  - 
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  -