Search results for "Environmental engineering"
showing 10 items of 2674 documents
Dip Phenomenon in High-Curved Turbulent Flows and Application of Entropy Theory
2018
The estimation of velocity profile in turbulent open channels is a difficult task due to the significant effects of the secondary flow. The present paper investigates the mechanism of the velocity-dip phenomenon, whereby the location of the maximum velocity appears to be below the free surface. Previous studies conducted in straight channels relate the mechanism of the velocity-dip phenomenon to secondary flow induced by anisotropy of turbulence. This work focuses on high-curved channels where the secondary motion, which is also induced by the channel’s curvature, evolves along the bend. The width-to-depth ratio, B/h, is one of the most important parameters that are affecting the secondary …
Electrical conductivity as a state indicator for the start-up period of anaerobic fixed-bed reactors.
2016
The aim of this work was to analyse the applicability of electrical conductivity sensors for on-line monitoring the start-up period of an anaerobic fixed-bed reactor. The evolution of bicarbonate concentration and methane production rate was analysed. Strong linear relationships between electrical conductivity and both bicarbonate concentration and methane production rate were observed. On-line estimations of the studied parameters were carried out in a new start-up period by applying simple linear regression models, which resulted in a good concordance between both observed and predicted values. Electrical conductivity sensors were therefore identified as an interesting method for monitori…
Source shape and data analysis procedure effects on hydraulic conductivity of a sandy-loam soil determined by ponding infiltration runs
2017
Performing ponding infiltration runs with non-circular sources could represent a good means to sample completely an area of interest. Regardless of the shape of the source, predicting the expected reliability of the collected data by infiltrometers should facilitate soil hydraulic characterisation and also allow a more conscious use of the field data. The influence of the shape of the infiltration source (i.e., circular or square) and the analysis procedure of the steady-state infiltration data on the saturated hydraulic conductivity, Ks, of a sandy-loam soil was tested in this investigation. Circular and square surfaces sampled with the pressure infiltrometer (PI) yielded similar estimates…
Prise en compte des réseaux écologiques dans le choix du tracé d'une infrastructure de transport
2017
National audience
Restauration de la connectivité écologique : proposition méthodologique pour une localisation optimisée des passages à faune
2017
National audience
Évaluation de l'impact potentiel d'une infrastructure sur la connectivité des mares
2017
National audience
Quantifier la contribution des espaces verts d'entreprise aux connectivités écologiques d'Île-de-France
2017
International audience
Création et réhabilitation de passages à faune favorables à plusieurs espèces : cas d'étude dans le Grésivaudan
2017
International audience
Graphab. 14 réalisations à découvrir. Actes de la journée "Retour d’expérience sur Graphab" du 27 juin 2017
2018
International audience
BaGaTel: an ontology driven database to ecodesign food products taking into account their nutritional and sensory qualities
2020
International audience