2,856 Works

DESTRUCTIVE FACTORS CAUSING DETERIORATION OF PAINTS ON BUILDINGS WALLS

RUTA MINIOTAITE & RUTA MINIOTAITE
Durability of the surfaces depends on prevailing climate effects and on a complex of physical and mechanical values of the materials used. Damage of external walls depends on a high moisture content. One example of such damage is damage due to direct water penetration in walls. The other negative effects of a high moisture content are impaired heat insulation and accelerated degradation. The investigation of the external layer of walls and durability of different paints...

Design of the Basic Engineering Project subject for the second year of Electrical Engineering at Telecom BCN

Eduard Alarcon, Ramon Bragos, Josep Pegueroles, Adriano Camps, Albert Oliveras, Miguel Garcia-Hernandez & Elisa Sayrol
The second design-implement subject in the Telecom-BCN electrical engineering curricula is described. The students design and build a block of a complex ICT system from its specifications, but knowing the characteristics of the whole system. The different blocks should be representative of the four majors of our curricula (electronics, audiovisual systems, networks and communication systems). We developed a strategy to run simultaneously four different project parts with initially mixed students. The topic chosen for this...

Developing engineering design core competences through analysis of industrial products

Claus Thorp Hansen & Torben Lenau
Many product development projects are directed towards designing an upgraded variant of an existing product. These redesign projects require that the engineering designers understand needs and requirements from users, and know how the existing product functions and how it is manufactured. For an engineering designer to be able to contribute to a redesign project, he/she must have core competences to carry through a composite product analysis, which encompasses both a user-oriented and a technical side....

Developing Open Source System Expertise in Europe

Mads Nyborg, Finn Gustafsson & Jørgen Christensen
Developing Open Source System Expertise in Europe is an Erasmus intensive programme (IP). The aim of this IP is to exchange knowledge of and experience in local methods and techniques in the field of open source software knowledge in ICT by engaging a group of European students and lecturers in a joint, explorative investigation of contemporary methods of open source software systems. In this paper we describe our experience in setting up a design-build project...

Seasonal flood frequency analysis based on disaggregated urban runoff data

B. V. Matheussen, S. T. Thorolfsson & D. P. Lettenmaier
Current design procedures for urban drainage systems are based on the assumption that it is short duration summer rainfall that produces the highest annual runoff peaks. Despite this several researchers report that in cold climates urban flooding may also happen as a consequence of rain in combination with snowmelt. Because of this we chose to question the assumption of rainfall being the only factor controlling urban flooding in cold climates like in Trondheim, Norway. Through...

Role of pore–scale heterogeneity on reactive flows in porous materials: validity of the continuum representation of reactive transport

Qinjun Kang, Peter Lichtner & Peter Lichtner
Understanding multi-component reactive transport in porous media is critical to a wide range of fields. It poses great challenges to theoretical, experimental, as well as numerical studies, because it usually involves multiple processes (advection, diffusion, reaction) and multiple scales (molecular, pore, laboratory, field). Current modeling approaches commonly employ a continuum description and rely on volume averages. Because in porous media, averages are taken over length scales much larger than typical grain sizes, spatial heterogeneity at...

Analysis of Uncertainty in the Development of Integrated Solutions

Tabea Ramirez Hernandez, Melanie Kreye & Daniela Cristina Antelmi Pigosso

The city of Montreal's overflow control program

J. Lamarre, D. D. T. Duong, A. Charron & H. Colas
The Quebec provincial government (Minist\303\250re de l\342\200\231Environnement du Qu\303\251bec) has defined environmental discharge objectives (EDO) to protect receiving water bodies and their use against CSOs, SSOs and storm water pollution. The objectives have been established on the basis of direct and indirect water uses, which are to be protected or rehabilitated. They have been defined in terms of maximum overflow frequencies per area and based on the uses of the receiving water bodies. The City...

Parameter Estimation of the Nonlinear Muskingum Model Using Ant Colony Optimization

Mortazavi Naeini Seyed Mohammad & Mortazavi Naeini Seyed Mohammad
There are two types of basic approaches to route floods : the hydrologic routing approaches and the hydraulic routing approache. One of the hydrologic routing techniques, the Muskingum method has been frequently used to route floods in natural channels and rivers.In this paper, parameter estimation of the nonlinear Muskingum model is presented by Using Ant Colony Optimization. Ant Colony Optimization (ACO) is one of the recent optimization methods which is inspired by the fact that...

Robust design, Predictable innovation

Niels Hansen

A Sequential Bayesian Approach for Hydrologic Model Selection, Combination, and Predictions

Kuolin Hsu, Hamid Moradkhani, Soroosh Sorooshian & Kuolin Hsu
Recently there is a growing popularity of using multiple models in ensemble hydrologic forecasting. In those approaches, a large number of models are selected, with each model being initialized for specific behavior. Because there is no such a model which performs well at all times, it is important to identify the strength of each model and provide an effective strategy in selecting model/models under new available observations. To achieve the fast tracking of model behavior...

Mineral Grain Spatial Patterns and Reaction Rate Up-Scaling

Catherine Peters, Jason Lewandowski, Marissa Maier, Michael Celia, Li Li & Catherine Peters
Reactive transport models that describe mineral reactions in porous media rely on laboratory measurements of rate parameters that may fail to represent reactions defined at larger averaging scales. Laboratory experiments usually use crushed minerals in well-mixed systems that are designed to eliminate mass transport limitations. The resulting data provide valuable information on mineral reactivities but have questionable value for describing reaction rates in porous media in which mass transport may be rate-limiting. In recently completed...

A method to optimize building construction cost when drying excess moisture in materials

Peter Brander & Peter Brander
Drying of excess moisture in building materials in building projects is crucial if healthy buildings are to be obtained. Mostly that requires a preliminary heating system combined with even more machinery like dehumidifiers to get low risks of mould growth during construction. Up till now the understanding of how to obtain and maintain good drying climate different seasons has been poor in Sweden. Often the companies involved use simple thumb rules like x watts per...

Assessment of CSO loads \342\200\223 based on UV/VIS spectroscopy by means of different regression methods

M. Hochedlinger, H. Kainz & W. Rauch
The use of UV/VIS-spectroscopy for water quality measurements is based on the solution of the correlation between the surrogate parameter absorbance and the resulting equivalence parameters. The coherence of absorbance and equivalence parameters (CODtot, CODsol, TSS) will be solved in this paper with different regression methods. The correlation of absorbance and concentrations are analysed based on linear regression methods, model tree regressions, multivariate regression methods and support vector machines using sequential minimal optimisation algorithm. For...

MODELING AND EXPERIMENTAL DETERMINATION OF CONVECTIVE VAPOUR TRANSFER COEFFICIENTS

Adam Neale, Dominique Derome, Bert Blocken, Jan Carmeliet & Adam Neale
Convective surface coefficients are commonly used in whole building simulation to model the indoor and outdoor heat and mass transport boundary conditions. There are some standards and guidelines available for convective heat transfer coefficients, which generally include correlations for simple geometries. The convective vapour transfer coefficients are not so well documented and are often calculated with the heat and mass transfer analogy, and then subsequently applied for cases in which the analogy is not valid....

Development and investigation of a pollution control pit for treatment of stormwater from metal roofs and traffic areas

C. Dierkes, P. G\303\266bel, M. Lohmann & W.G. Coldewey
Source control by on-site retention and infiltration of stormwater is a sustainable and proven alternative to classical drainage methods. Unfortunately sedimentary particles and pollutants from drained surfaces cause clogging and endanger soil and groundwater during long-term operation of infiltration devices. German water authorities recommend the use of infiltration devices such as swales or swale-trench-systems. Direct infiltration by underground facilities such as pipes, trenches or sinks without pre-treatment of runoff is generally not permitted. Problems occur...

Pressure equalisation as design strategy for watertight windows

Nathan Van Den Bossche, Arnold Janssens, Jan Moens & Nathan Van Den Bossche
In order to shield the indoor environment from the exterior most building components are assembled out of several layers of materials to meet different performance requirements (watertightness, airtightness, thermal resistance, stability etc). In that regard windows and doors are usually the weak spot of the building because it is a transition from the building component to the glass where all the different materials and functions are literally forced together. On top we want them to...

Performance indicators for waste water treatment and urban drainage system

G. Vaes, P. Swartenbroekx, F. Provost, S. Van Den Broeck & L. Bourgoing
In Flanders the practical implementation of investments in main sewers and treatment plants and the exploitation of it, is carried out by Aquafin. The investments are commissioned by the Flemish government, who wants to introduce a result commitment that is function of the performance of the management of the waste water transport and treatment system. To realise this, a framework of performance indicators was worked out and tested. For the typical Flemish waste water system...

Use of 3D modeling to instrument CSOs

G. Lipeme Kouyi, J. Vazquez, Y. Simonin, M. Zug & J.B. Poulet
The assessment of the flows and the pollutant load discharged into the natural environment requires the installation of an adequate instrumentation. The knowledge of the hydraulic operation of the Combined Sewer Overflows (CSOs) is thus essential. We use 3D modeling (FLUENT) in order to understand the hydrodynamics in these works. Initially, the numerical results arising from 3D modeling of the flows in side storm overflows were validated in experiments in laboratory. In the second time,...

Digital material for the book: Sumer, B.M. and Fuhrman, D.R. (2020) Turbulence in Coastal and Civil Engineering. World Scientific. (Book DOI: 10.1142/10829)

David R. Fuhrman & B. Mutlu Sumer
This collection contains all supplemental digital material for the text book:
Sumer, B.M. and Fuhrman, D.R. (2020) Turbulence in Coastal and Civil Engineering. World Scientific. DOI: 10.1142/10829
This includes data sets and the turbulence model intended for use in the hands-on exercises in Chapter 10.
This also includes Matlab analysis examples from Chapter 4.

Removal of bacterial indicators of fecal contamination in urban stormwater using a natural riparian buffer

M. Casteel, G. Bartow, S. R. Taylor & P. Sweetland
Little information is available on the ability of naturally-occurring riparian buffers to remove waterborne microbes from urban stormwater runoff. In the present study, bacterial indicators of fecal contamination were quantified in stormwater before and after intentional diversion to a natural riparian buffer (RB) adjacent to a lake located in the City of San Francisco, California. Analysis of lake water showed that levels of Escherichia coli and total coliforms increased significantly during storm events, indicating the...

Adaptive streamline tracing for streamline simulation on irregular grids

Håkon Hægland, Helge Dahle, Geir Terje Eigestad, Knut-Andreas Lie, Ivar Aavatsmark & Håkon Hægland
Streamline methods have shown to be effective for reservoir simulation. Streamline simulation relies on an efficient an accurate calculation of streamlines and time-of-flight coordinates (TOF). Streamlines are commonly computed on a cell-by-cell basis using a flux interpolation in the semi-analytical Pollock's method. An alternative method is a grid-cell corner-point velocity interpolation, which is able to reproduce uniform flow in three spatial dimensions. For this method numerical integration of streamlines is required. The shape of streamlines...

Simultaneous heat and solute transport modeling of ground water with lattice Boltzmann methods

Kathleen Bardsley, Shadab Anwar, Michael Sukop & Michael Sukop
Recent advances in lattice Boltzmann modeling permit simulation of large-scale density-dependent ground water flow and heat/solute transport systems while retaining the advantages of ‘regular’ lattice Boltzmann methods, such as solute/heat transport at higher Reynolds numbers that can characterize flows in conduits. We model the simultaneous heat/solute problem described by Henry and Hilleke in 1972 as an extension of Henry’s classic 1964 seawater intrusion problem. We also demonstrate the method’s ‘dual domain’ modeling potential.

Assessment of extraneous water inflow in separated sewer networks

C. Karpf & P. Krebs
Separate sewer systems provide due to the separate transport and treatment of waste water and rain water an efficient sewerage technology. But the advantage compared to combined system technology gets lost if the input of extraneous water exceeds the capacity of the system. Especially the input of rainwater into the waste water pipes depending on the drained area is responsible for an overload of the sewer system and the wastewater treatment plant (WWTP). In the...

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