@inproceedings{ValeroBung2016, author = {Valero, Daniel and Bung, Daniel B.}, title = {Interfacial velocity estimation in highly aerated stepped spillway flows with a single tip fibre optical probe and Artificial Neural Networks}, series = {6th IAHR International Junior Researcher and Engineer Workshop on Hydraulic Structures, May 30th to June 1st 2016. L{\"u}beck, Germany}, booktitle = {6th IAHR International Junior Researcher and Engineer Workshop on Hydraulic Structures, May 30th to June 1st 2016. L{\"u}beck, Germany}, doi = {10.15142/T3Q590}, pages = {13 Seiten}, year = {2016}, abstract = {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.}, language = {en} } @incollection{FeldmannDoeringPyschny2016, author = {Feldmann, M. and D{\"o}ring, Bernd and Pyschny, D.}, title = {Floor systems; Sustainabilty analyses and assessments of steel bridges}, series = {Sustainable steel buildings : a practical guide for structures and envelopes}, booktitle = {Sustainable steel buildings : a practical guide for structures and envelopes}, publisher = {Wiley Blackwell}, address = {Chichester, West Sussex}, isbn = {978-1-118-74079-8 (PDF)}, pages = {198 -- 223}, year = {2016}, language = {en} } @book{BleningerBrendaBungetal.2016, author = {Bleninger, T. and Brenda, M. and Bung, Daniel B. and Hengl, M. and Schmid, B.H. and Schneider, E. and Sonnenburg, A. and Stoschek, O.}, title = {DWA-Regelwerk M 544-2 : Merkblatt: Ausbreitungsprobleme von Einleitungen - Prozesse, Methoden und Modelle - Teil 2: Mehrdimensionale Modelle}, address = {Hennef}, organization = {DWA, Deutsche Vereinigung f{\"u}r Wasserwirtschaft, Abwasser und Abfall e.V.}, isbn = {978-3-88721-281-0}, pages = {91 Seiten}, year = {2016}, language = {de} } @article{Hebel2017, author = {Hebel, Christoph}, title = {Erfahrungen mit der RIN und aktuelle Weiterentwicklungen}, series = {Straßenverkehrstechnik: Organ der Forschungsgesellschaft f{\"u}r Straßen- und Verkehrswesen, der Bundesvereinigung der Straßenbau- und Verkehrsingenieure und der {\"O}sterreichischen Forschungsgesellschaft Straße und Verkehr; Zeitschrift f{\"u}r Verkehrsplanung, Verkehrsmanagement, Verkehrssicherheit, Verkehrstechnik}, volume = {61}, journal = {Straßenverkehrstechnik: Organ der Forschungsgesellschaft f{\"u}r Straßen- und Verkehrswesen, der Bundesvereinigung der Straßenbau- und Verkehrsingenieure und der {\"O}sterreichischen Forschungsgesellschaft Straße und Verkehr; Zeitschrift f{\"u}r Verkehrsplanung, Verkehrsmanagement, Verkehrssicherheit, Verkehrstechnik}, number = {7}, publisher = {Kirschbaum-Verlag}, address = {Bonn}, issn = {0039-2219}, pages = {443 -- 448}, year = {2017}, language = {de} } @article{Hoettges2017, author = {H{\"o}ttges, J{\"o}rg}, title = {QKan - Management of drainage system data with QGIS}, series = {Free and Open Source Software for Geospatial (FOSS4G) Conference Proceedings}, volume = {17}, journal = {Free and Open Source Software for Geospatial (FOSS4G) Conference Proceedings}, number = {Article 13}, pages = {95 -- 100}, year = {2017}, language = {en} } @phdthesis{Mainz2017, author = {Mainz, Stefan}, title = {Zur Berechnung der Tragf{\"a}higkeit von d{\"u}nnwandigen Koppelpfetten aus Kaltprofilen f{\"u}r Biegung um die schwache Achse und Torsion}, address = {Hamburg}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:1373-opus-3798}, pages = {261 Seiten}, year = {2017}, language = {de} } @book{UibelPeterson2017, author = {Uibel, Thomas and Peterson, Leif Arne}, title = {Tagungsband Aachener Holzbautagung 2017}, editor = {Uibel, Thomas and Peterson, Leif Arne}, publisher = {FH Aachen}, address = {Aachen}, issn = {2197-4489}, pages = {96 Seiten ; Illustrationen, graph. Darst.}, year = {2017}, language = {de} } @book{UibelPeterson2015, author = {Uibel, Thomas and Peterson, Leif Arne}, title = {Tagungsband Aachener Holzbautagung 2015}, editor = {Uibel, Thomas and Peterson, Leif Arne}, publisher = {FH Aachen}, address = {Aachen}, issn = {2197-4489}, pages = {85 Seiten. , Illustrationen, graph. Darst.}, year = {2015}, language = {de} } @article{LaumannMainzKrahwinkel2017, author = {Laumann, J{\"o}rg and Mainz, Stefan and Krahwinkel, Manuel}, title = {Traglastuntersuchungen an Koppelpfetten bei Biegung um die schwache Achse und Torsion}, series = {Stahlbau}, volume = {86}, journal = {Stahlbau}, number = {11}, publisher = {Wiley}, address = {Weinheim}, issn = {0038-9145}, doi = {10.1002/stab.201710544}, pages = {1005 -- 1016}, year = {2017}, language = {de} } @article{ValeroBung2018, author = {Valero, Daniel and Bung, Daniel B.}, title = {Reformulating self-aeration in hydraulic structures: Turbulent growth of free surface perturbations leading to air entrainment}, series = {International Journal of Multiphase Flow}, volume = {100}, journal = {International Journal of Multiphase Flow}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0301-9322}, doi = {10.1016/j.ijmultiphaseflow.2017.12.011}, pages = {127 -- 142}, year = {2018}, abstract = {A new formulation for the prediction of free surface dynamics related to the turbulence occurring nearby is proposed. This formulation, altogether with a breakup criterion, can be used to compute the inception of self-aeration in high velocity flows like those occurring in hydraulic structures. Assuming a simple perturbation geometry, a kinematic and a non-linear momentum-based dynamic equation are formulated and forces acting on a control volume are approximated. Limiting steepness is proposed as an adequate breakup criterion. Role of the velocity fluctuations normal to the free surface is shown to be the main turbulence quantity related to self-aeration and the role of the scales contained in the turbulence spectrum are depicted. Surface tension force is integrated accounting for large displacements by using differential geometry for the curvature estimation. Gravity and pressure effects are also contemplated in the proposed formulation. The obtained equations can be numerically integrated for each wavelength, hence resulting in different growth rates and allowing computation of the free surface roughness wavelength distribution. Application to a prototype scale spillway (at the Aviemore dam) revealed that most unstable wavelength was close to the Taylor lengthscale. Amplitude distributions have been also obtained observing different scaling for perturbations stabilized by gravity or surface tension. The proposed theoretical framework represents a new conceptualization of self-aeration which explains the characteristic rough surface at the non-aerated region as well as other previous experimental observations which remained unresolved for several decades.}, language = {en} }