Fak. 6 Planen Bauen Umwelt

995 Items

Recent Submissions
Prinzipien der Architekturdarstellung : die Verwendung der Orthogonalprojektion in Palladios »I quattro libri dell' architettura« (1570).

Valdivia Steel, Lorena Cristina (2018)

The term »orthogonal projection« refers to the representation format which marks the source of the present study of the principles of the architectural representation in Andrea Palladio’s printed works »I quattro libri dell’ architettura« published in 1570. Palladio’s special position in architectural history is not only due to his many built works but at least equally to his numerous orthogona...

An ALE method for penetration into sand utilizing optimization-based mesh motion

Aubram, Daniel ; Rackwitz, Frank ; Wriggers, Peter ; Savidis, Stavros A. (2015)

The numerical simulation of penetration into sand is one of the most challenging problems in computational geomechanics. The paper presents an arbitrary Lagrangian–Eulerian (ALE) finite element method for plane and axisymmetric quasi-static penetration into sand which overcomes the problems associated with the classical approaches. An operator-split is applied which breaks up solution of the go...

A comparison of different seismological and geotechnical parameters for site characterization

Boxberger, Tobias (2018)

The geometry of the subsoil structure, the soil types involved and the variation in their properties with depth, lateral discontinuities and surface topography are causes of lateral variation in earthquake-induced ground motion, over relatively small scales, referred to as "site effects" The modification of ground motion can manifest itself through amplification at particular frequencies (the ...

Homogeneous equilibrium model for geomechanical multi-material flow with compressible constituents

Aubram, Daniel (2016-04-09)

Multi-material flow generally describes a situation where several distinct materials separated by sharp material interfaces undergo large deformations. In order to model such flow situations in the context of geomechanics and geotechnical engineering, a theoretical framework is presented which introduces a possible two-phase coupled saturated granular material behavior among the different mater...

High-resolution shear wave reflection seismics and borehole seismics as tools for the imaging and the characterization of near-surface subrosion structures

Wadas, Sonja Halina (2018)

Subrosion and the resulting structures, such as sinkholes and depressions, pose a great hazard risk. They can cause damage to buildings and infrastructure, and lead to life-threatening situations. But compared to other natural hazards, like earthquakes and tsunamis, very little is known about the generation processes or the possibilities of forecasting. Germany suffers from a widespread sinkhol...

Driving forces and barriers for adaption strategies against the urban heat stress hazard in Berlin, Germany

Donner, Julie (2018)

Climate change is here and mitigation efforts will not be enough to stop it. We need to adapt to its unavoidable impacts. At the same time, increasing anthropogenic influence on urban climates is leading to worsening urban heat stress. Increased amounts of impervious area, dark surfaces, and the barrier effect of large buildings reduce the ability of especially dense, inner-city areas to cool t...

Physical influence of microbial communities on the structure and occlusion of particulate organic matter in a sandy agricultural soil

Büks, Frederick (2018)

Soil aggregate stability is an integral marker of soil fertility. Well aggregated soil contributes to high rootability, a proper water and aeration regime, resistance against compaction and erosion as well as storage capability of organic carbon. The aggregation of soil primary particles and microaggregates is promoted not only by a large variety of physico-chemical but also biological interact...

Nichtummantelte Sandsäulen in weichen Böden mit hohem organischen Anteil

Ney, Marcel (2018)

In der vorliegenden Arbeit wurden 20 klein- als auch großmaßstäbliche Modellversuche durchgeführt. Deren Ergebnisse wurden für einen Modifikationsansatz eines analytischen Bemessungsverfahrens genutzt. Es konnte nachgewiesen werden, dass unter Laborbedingungen kein Ausbauchen nichtummantelter Sandsäulen stattfindet. Es wurden wesentliche praxisrelevante Parameter variiert und deren Einflussauf ...

Urban flood modeling using shallow water equations with depth-dependent anisotropic porosity

Özgen, Ilhan ; Zhao, Jiaheng ; Liang, Dongfang ; Hinkelmann, Reinhard (2016-10)

The shallow water model with anisotropic porosity conceptually takes into account the unresolved subgrid-scale features, e.g. microtopography or buildings. This enables computationally efficient simulations that can be run on coarser grids, whereas reasonable accuracy is maintained via the introduction of porosity. This article presents a novel numerical model for the depth-averaged equations w...

Shallow water equations with depth-dependent anisotropic porosity for subgrid-scale topography

Özgen, Ilhan ; Liang, Dongfang ; Hinkelmann, Reinhard (2016-09)

This paper derives a novel formulation of the depth-averaged shallow water equations with anisotropic porosity for computational efficiency reasons. The aim is to run simulations on coarser grids while maintaining an acceptable accuracy through the introduction of porosity terms, which account for subgrid-scale effects. The porosity is divided into volumetric and areal porosities, which are ass...

Upscaling the shallow water model with a novel roughness formulation

Özgen, Ilhan ; Teuber, Katharina ; Simons, Franz ; Liang, Dongfang ; Hinkelmann, Reinhard (2015-08)

This study presents a novel roughness formulation to conceptually account for microtopography and compares it to four existing roughness models from literature. The aim is to increase the grid size for computational efficiency, while capturing subgrid scale effects with the roughness formulation to prevent the loss in accuracy associated with coarse grids. All roughness approaches are implement...

Determination of intensity-based stochastic models for terrestrial laser scanners utilising 3D-point clouds

Wujanz, Daniel ; Burger, Mathias ; Tschirschwitz, Felix ; Nietzschmann, Tassilo ; Neitzel, Frank ; Kersten, Thomas P. (18-07-07)

Recent advances in stochastic modelling of reflectorless rangefinders revealed an inherent relationship among raw intensity values and the corresponding precision of observed distances. In order to derive the stochastic properties of a terrestrial laser scanner’s (TLS) rangefinder, distances have to be observed repeatedly. For this, the TLS of interest has to be operated in the so-called 1D-mod...

The viability of certification systems in actualizing sustainable urban development

Gouda, Amr Ahmed Mohamed (2018)

Urban sustainability is a lasting cyclic process that conditions continuous assessment, mounting new goals and iterative rectification rather a one-off task. Sustainability assessment allows policy makers, planners, and designers to make better-informed decisions. Ergo, assessment is conceived as one of the cornerstones of sustainability. Over the last decade, a number of urban sustainability c...

Linking conflict and collaboration; bottom-up urban regeneration within top-down structure of urban policy in Istanbul and Tehran

Mansoorian, Mahfarid (2018)

The problem of urban decayed areas is of the defining features of a sizable number of cities in developing countries. While currently the participatory urban regeneration policy (which takes both the socio economic complications as well as the physical decay into consideration) seems to be a consensus among many scholars, the question is how these policies can be realized within the specific pr...

On the frequency-dependence of electrical soil properties and their influence on ground-penetrating radar

Loewer, Markus (2018)

Ground-Penetrating Radar (GPR) is sensitive to changes of electrical soil properties. These properties can become strongly frequency-dependent, even so they are considered constant in many applications. Analysis of radargrams provided evidence that radar waves propagating in moist loamy and clayey soils underlie strong absorption and dispersion effects. The energy absorption together with the w...

Quality control for crowdsourced data from CWS

Grassmann, Tom ; Napoly, Adrien ; Meier, Fred ; Fenner, Daniel (2018)

This package performs a quality control (QC) and filters suspicious data from citizen weather stations (CWS). It was designed for hourly air temperature data from Netatmo stations but should work with any normally-distributed data.

The influence of nanomaterials on the thermal resistance of cement-based composites – a review

Pawel, Sikora ; Abd Elrahman, Mohamed ; Stephan, Dietmar (2018-06-26)

Exposure to elevated temperatures has detrimental effects on the properties of cementitious composites, leading to irreversible changes, up to total failure. Various methods have been used to suppress the deterioration of concrete under elevated temperature conditions. Recently, nanomaterials have been introduced as admixtures, which decrease the thermal degradation of cement-based composites a...

Conceptual simplifications for long-term sediment transport simulations

Zhang, Qing (2018)

The aim of this PhD thesis is to assess the long-term evolution of the fine sediment budget in the Iffezheim reservoir, which is the last barrage of the impounded section of the Rhine River. Based on the observed flow and suspended sediment concentration as well as echo-sounding data, various methods were proposed to estimate long-term riverbed changes. The application of a high-resolution 3D m...

A multi-criteria approach for assessing the sustainability of small-scale cooking and sanitation technologies

Krause, Ariane ; Köppel, Johann (2018-06-11)

To reduce the consumption of firewood for cooking and to realise recycling-driven soil fertility management, three projects in Northwest Tanzania aim to provide the local smallholder community with cooking and sanitation alternatives. The present study proposes an integrated approach to assess the sustainability of the small-scale cooking and sanitation technologies. Based on the multi-criteria...

Multi-dimensional flow and transport modeling of a surface water body in a semi-arid area

Matta, Elena (2018)

Since approximately 2012, Northeast Brazil dramatically suffers from the harshest drought in the recent history, with serious consequences on water resources, anthropogenic uses and ecosystem services. Among else, the hydropower production, irrigation agriculture, water supply and net cage aquaculture are the principal uses adopted in the Itaparica Reservoir, located in the Sub-Middle São Franc...