TY  - JOUR
A1  - Bayon, Arnau
A1  - Valero, Daniel
A1  - Garcia-Bartual, Rafael
A1  - Vallés-Morán, Francisco José
A1  - López-Jiménez, P. Amparo
T1  - Performance assessment of OpenFOAM and FLOW-3D in the numerical modeling of a low Reynolds number hydraulic jump
JF  - Environmental Modelling & Software
N2  - A comparative performance analysis of the CFD platforms OpenFOAM and FLOW-3D is presented, focusing on a 3D swirling turbulent flow: a steady hydraulic jump at low Reynolds number. Turbulence is treated using RANS approach RNG k-ε. A Volume Of Fluid (VOF) method is used to track the air–water interface, consequently aeration is modeled using an Eulerian–Eulerian approach. Structured meshes of cubic elements are used to discretize the channel geometry. The numerical model accuracy is assessed comparing representative hydraulic jump variables (sequent depth ratio, roller length, mean velocity profiles, velocity decay or free surface profile) to experimental data. The model results are also compared to previous studies to broaden the result validation. Both codes reproduced the phenomenon under study concurring with experimental data, although special care must be taken when swirling flows occur. Both models can be used to reproduce the hydraulic performance of energy dissipation structures at low Reynolds numbers.
Y1  - 2016
SN  - 1364-8152
U6  - http://dx.doi.org/10.1016/j.envsoft.2016.02.018
VL  - 80
SP  - 322
EP  - 335
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Biener, Ernst
T1  - Rehabilitation of old gravity dams
JF  - [Transactions] : proceedings of fifteenth international congress on large dams ; 24 - 28 Juin 1985, Lausanne, Suisse = Quinzieme Congres International des Grands Barrages. - Bd. 4
Y1  - 1985
N1  - International Congress on Large Dams <15, 1985, Paris>
SP  - Q 59, R.2, S. 21
EP  - 23
PB  - Intern. Commission on Large Dams
CY  - Paris
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Bethke, H.
A1  - Sasse, T.
A1  - Wernhoff, T.
T1  - Alternative landfill capping using locally available recycled material
JF  - Land contamination & reclamation. 14 (2003), H. 4
Y1  - 2003
SN  - 0967-0513
SP  - 419
EP  - 427
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Boyken, P.
A1  - Sasse, T.
T1  - Integrated dredged material management system of Bremen-Seehausen
JF  - Sardinia 97 : proceedings ; [13 - 17 October 1997, S. Margherita di Pula - Cagliari, Sardinia, Italy] / Sixth International Landfill Symposium. Ed.: Thomas H. Christensen... - Bd. 5 : Landfill regulations, waste characteristics, landfilling in middle and lower income countries, industrial wastes and monolandfills
Y1  - 1997
N1  - International Landfill Symposium <6, 1997, Santa Margherita, Pula>
SP  - 497
EP  - 502
PB  - CISA, Environmental Sanitary Engineering Centre
CY  - Cagliari
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Boyken, P.
A1  - Sasse, T.
A1  - Arnold, J.
T1  - Geotechnical aspects of the construction of the integrated harbour sludge management system in Bremen-Seehausen / P. Boyken ;  E. Biener ; T. Sasse ; J. Arnold
JF  - Geotechnical engineering for transportation infrastructure : proceedings of the twelfth European Conference on Soil Mechanics and Geotechnical Engineering, Amsterdam, Netherlands, 7 - 10 June 1999 ; theory and practice, planning and design, construction and maintenance. - Vol. 2
Y1  - 1999
SN  - 90-5809-049-3
N1  - European Conference on Soil Mechanics and Geotechnical Engineering <12, 1999, Amsterdam>
SP  - 909
EP  - 914
PB  - Balkema
CY  - Rotterdam
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Rouvé, G.
T1  - Behaviour and maintenance of some old masonry gravity dams
JF  - Safety of dams : proceedings of the International Conference on Safety of Dams, Coimbra, 23-28 April 1984 / ed. by J. Laginha Serafim. - [Hauptbd.]
Y1  - 1984
SN  - 90-6191-522-8
N1  - International Conference on Safety of Dams <1984, Coimbra> ; ISBN Set: 90-6191-521-X
SP  - 101
EP  - 106
PB  - Rotterdam [u.a.]
CY  - Balkema
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
T1  - Construction and rehabilitation of landfill shafts
JF  - Sardinia 93 : Fourth International Landfill Symposium "Barrier systems, environmental aspects, upgrading and remediation, siting, monofills, effects of waste pretreatment, landfilling in developing countries" ; 11 - 15 October 1993, S. Margherita di Pula (Cagliari), Sardinia, Italy ; proceedings / coord. by Thomas H. Christensen ... - Bd. 1
Y1  - 1993
N1  - International Landfill Symposium <4, 1993, Santa Margherita, Pula>
SP  - 451
EP  - 460
PB  - CISA, Environmental Sanitary Engineering Centre
CY  - Cagliari
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
T1  - Quality improvements in the construction of multilayer covers
JF  - Géologie et confinement des déchets toxiques : actes du symposium international, 8 - 11 juin 1993 / GEOCONFINE 93, Montpellier, France. Réd. Marcel Arnould
Y1  - 1993
SN  - 90-5410-330-2
N1  - Geoconfine <1993, Montpellier> ; Paralellt.: Geology and confinement of toxic wastes
SP  - 309
EP  - 312
PB  - Balkema
CY  - Rotterdam [u.a.]
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
T1  - Construction of composite lining systems under unfavourable weather conditions
JF  - Landfilling of waste: barriers / ed. by T. H. Christensen; R. Cossu; R. Stegmann. - 1. Aufl.
Y1  - 1994
SN  - 0419159908
SP  - 183
EP  - 200
PB  - Spon
CY  - London [u.a.]
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
T1  - Experience with new techniques in slurry cutoff wall construction
JF  - ISWA 88, proceedings of the 5th International Solid Wastes Conference : September 11 - 16th, 1988, Copenhagen, Denmark / ed. by Lizzi Andersen ... - Vol. 1 : Oral presentations
Y1  - 1988
SN  - 0-12-058451-4
N1  - International Solid Wastes Conference <5, 1988, København> ; International Solid Wastes and Public Cleansing Association
SP  - 41
EP  - 46
PB  - Acad. Press
CY  - London [u.a.]
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
A1  - Arnold, J.
A1  - Woltering, S.
T1  - New treatment of harbour sludge in Bremen and Bremerhaven  /  E. Biener ; T. Sasse ; J. Arnold ; S. Woltering ; N. Binder
JF  - Characterisation and treatment of sediments : Antwerpen, Belgium, September 15 - 17, 1999 ; [preceded by 12th International Harbour Congress] ; proceedings / CATS 4. Ed.: G. De Schutter. Organized by: Technologisch Instituut, Koninklijke Vlaamse Ingenieursvereniging
Y1  - 1999
SN  - 9076019118
N1  - CATS <4, 1999, Anvers>
SP  - 115
EP  - 122
PB  - Technolog. Inst.
CY  - Anvers
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
A1  - Bökers, H.
T1  - Preliminary or final capping of sanitary landfills? : Technical and economical aspects
JF  - Sardinia 99 : proceedings / Seventh International Waste Management and Landfill Symposium, [4 - 8 October 1999, S. Margherita di Pula, Cagliari, Sardinia, Italy]. Ed.: Thomas H. Christensen. -  Bd. 3 : Barriers, waste mechanics and landfill design
Y1  - 1999
N1  - International Waste Management and Landfill Symposium <7, 1999, Cagliari>
SP  - 287
EP  - 294
PB  - CISA, Environmental Sanitary Engineering Centre
CY  - Cagliari
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
A1  - Konertz, K.
T1  - Preparation of mineral sealing materials for landfills by different processing technologies / Sasse, T. ; Biener, E. ; Konertz, K.
JF  - Sardinia 93 : Fourth International Landfill Symposium "Barrier systems, environmental aspects, upgrading and remediation, siting, monofills, effects of waste pretreatment, landfilling in developing countries" ; 11 - 15 October 1993, S. Margherita di Pula (Cagliari), Sardinia, Italy ; proceedings / coord. by Thomas H. Christensen ... - Bd. 1
Y1  - 1993
N1  - International Landfill Symposium <4, 1993, Santa Margherita, Pula>
SP  - 275
EP  - 283
PB  - CISA, Environmental Sanitary Engineering Centre
CY  - Cagliari
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Sasse, T.
A1  - Wernhoff, T.
T1  - Using harbour dredged material for combination sealing of the former Bockhorner Weg disposal site in Bremen, Germany
JF  - Proceedings of the International Harbour Congress. 13 (2003)
Y1  - 2003
N1  - International Harbour Congress <13, 2003, Antwerpen>
SP  - 101
EP  - 109
ER  - 
TY  - JOUR
A1  - Biener, Ernst
A1  - Wemhoff, T.
A1  - Bethke, H.
T1  - Stability and settlement problems based on the example of the Blockland landfill in Bremen
JF  - Sardinia 95 : Fifth International Landfill Symposium ; (2 - 6 October 1995, S. Margheritadi Pula - Cagliari, Sardinia, Italy) ; proceedings / coord.: Thomas H. Christensen ... - Bd. 2 : Siting, lining, drainage & landfill mechanics
Y1  - 1995
N1  - International Landfill Symposium <5, 1995, Santa Margherita, Pula>
SP  - 843
EP  - 853
PB  - CISA, Environmental Sanitary Engineering Centre
CY  - Cagliari
ER  - 
TY  - JOUR
A1  - Blanke, Tobias
A1  - Hagenkamp, Markus
A1  - Döring, Bernd
A1  - Göttsche, Joachim
A1  - Reger, Vitali
A1  - Kuhnhenne, Markus
T1  - Net-exergetic, hydraulic and thermal optimization of coaxial heat exchangers using fixed flow conditions instead of fixed flow rates
JF  - Geothermal Energy
N2  - Previous studies optimized the dimensions of coaxial heat exchangers using constant mass fow rates as a boundary condition. They show a thermal optimal circular ring width of nearly zero. Hydraulically optimal is an inner to outer pipe radius ratio of 0.65 for turbulent and 0.68 for laminar fow types. In contrast, in this study, fow conditions in the circular ring are kept constant (a set of fxed Reynolds numbers) during optimization. This approach ensures fxed fow conditions and prevents inappropriately high or low mass fow rates. The optimization is carried out for three objectives: Maximum energy gain, minimum hydraulic efort and eventually optimum net-exergy balance. The optimization changes the inner pipe radius and mass fow rate but not the Reynolds number of the circular ring. The thermal calculations base on Hellström’s borehole resistance and the hydraulic optimization on individually calculated linear loss of head coefcients. Increasing the inner pipe radius results in decreased hydraulic losses in the inner pipe but increased losses in the circular ring. The net-exergy diference is a key performance indicator and combines thermal and hydraulic calculations. It is the difference between thermal exergy fux and hydraulic efort. The Reynolds number in the circular ring is instead of the mass fow rate constant during all optimizations. The result from a thermal perspective is an optimal width of the circular ring of nearly zero. The hydraulically optimal inner pipe radius is 54% of the outer pipe radius for laminar fow and 60% for turbulent fow scenarios. Net-exergetic optimization shows a predominant infuence of hydraulic losses, especially for small temperature gains. The exact result depends on the earth’s thermal properties and the fow type. Conclusively, coaxial geothermal probes’ design should focus on the hydraulic optimum and take the thermal optimum as a secondary criterion due to the dominating hydraulics.
Y1  - 2021
U6  - http://dx.doi.org/10.1186/s40517-021-00201-3
SN  - 2195-9706
N1  - Corresponding author: Tobias Blanke
VL  - 9
IS  - Article number: 19
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Bung, Daniel B.
T1  - Non-intrusive detection of air–water surface roughness in self-aerated chute flows
JF  - Journal of hydraulic research
Y1  - 2013
SN  - 1814-2079 (E-Journal); 0022-1686 (Print)
VL  - Vol. 51
IS  - Iss. 3
SP  - 322
EP  - 329
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Bung, Daniel B.
T1  - Developing flow in skimming flow regime on embankment stepped spillways
JF  - Journal of hydraulic research
Y1  - 2011
SN  - 1814-2079 (E-Journal); 0022-1686 (Print)
VL  - Vol. 49
IS  - Iss. 5
SP  - 639
EP  - 648
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Bung, Daniel B.
A1  - Crookston, Brian M.
A1  - Valero, Daniel
T1  - Turbulent free-surface monitoring with an RGB-D sensor: the hydraulic jump case
JF  - Journal of Hydraulic Research
Y1  - 2020
U6  - http://dx.doi.org/10.1080/00221686.2020.1844810
SN  - 1814-2079
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Bung, Daniel B.
A1  - Valero, Daniel
T1  - Re-aeration on stepped spillways with special consideration of entrained and entrapped air
JF  - Geosciences
N2  - As with most high-velocity free-surface flows, stepped spillway flows become self-aerated when the drop height exceeds a critical value. Due to the step-induced macro-roughness, the flow field becomes more turbulent than on a similar smooth-invert chute. For this reason, cascades are oftentimes used as re-aeration structures in wastewater treatment. However, for stepped spillways as flood release structures downstream of deoxygenated reservoirs, gas transfer is also of crucial significance to meet ecological requirements. Prediction of mass transfer velocities becomes challenging, as the flow regime differs from typical previously studied flow conditions. In this paper, detailed air-water flow measurements are conducted on stepped spillway models with different geometry, with the aim to estimate the specific air-water interface. Re-aeration performances are determined by applying the absorption method. In contrast to earlier studies, the aerated water body is considered a continuous mixture up to a level where 75% air concentration is reached. Above this level, a homogenous surface wave field is considered, which is found to significantly affect the total air-water interface available for mass transfer. Geometrical characteristics of these surface waves are obtained from high-speed camera investigations. The results show that both the mean air concentration and the mean flow velocity have influence on the mass transfer. Finally, an empirical relationship for the mass transfer on stepped spillway models is proposed.
Y1  - 2018
SN  - 2076-3263
VL  - 8
IS  - 9
SP  - Article number 333
PB  - MDPI
CY  - Basel
ER  -