Searched for: subject:"tracers"
(1 - 20 of 20)
document
Stegeman, B. (author), Langeveld, J.G. (author), Bogaard, T.A. (author), Clemens, F.H.L.R. (author)
Due to the ageing of our underground wastewater infrastructure, leakage of sewers and pressure mains and subsequent infiltration or exfiltration are becoming an increasingly important issue. Herein, we present a novel method to detect and potentially quantify exfiltration from sewer systems under variable flow conditions; the DEST method. The...
conference paper 2019
document
Sprenger, Matthias (author), Stumpp, Christine (author), Weiler, Markus (author), Aeschbach, Werner (author), Allen, Scott T. (author), Benettin, Paolo (author), Dubbert, Maren (author), Hartmann, Andreas (author), Hrachowitz, M. (author)
The time that water takes to travel through the terrestrial hydrological cycle and the critical zone is of great interest in Earth system sciences with broad implications for water quality and quantity. Most water age studies to date have focused on individual compartments (or subdisciplines) of the hydrological cycle such as the unsaturated...
review 2019
document
Lenchenkov, N. (author), Glasbergen, G. (author), van Kruijsdijk, C.P.J.W. (author)
Heterogeneous reservoirs often have poor sweep efficiency during flooding. Although polymer flooding can be used to improve the recovery, in-depth diversion might provide a more economical alternative. Most of the in-depth diversion techniques are based on the propagation of a system that forms a gel in the reservoir. Premature cross-linking...
journal article 2018
document
Mouchet, A. (author), Cornaton, F. (author), Deleersnijder, E.L.C. (author), Delhez, E.J.M. (author)
The concept of age is widely used to quantify the transport rate of tracers - or pollutants - in the environment. The age focuses only on the time taken to reach a given location and disregards other aspects of the path followed by the tracer parcel. To keep track of the subregions visited by the tracer parcel along this path, partial ages are...
journal article 2016
document
Munyaneza, O. (author)
This book presents the hydrological research carried out in the Migina catchment (260 km2), Southern Rwanda. The main objective of the research is to explore the hydrological trends and climate linkages for catchments in Rwanda (26,338 km2), and to contribute to the understanding of dominant hydrological process interactions. Different hydro...
doctoral thesis 2014
document
Foppen, J.W. (author), Seopa, J. (author), Bakobie, N. (author), Bogaard, T. (author)
Stream tracer injection experiments are useful for characterizing hydrological and biogeochemical processes in streams. We used nonconservative synthetic DNA and conservative NaCl in six instantaneous tracer injection experiments in streams in the Benelux. The main aim was to compare the performance of injected synthetic DNA tracer “T23” with...
journal article 2013
document
Mahmood, A. (author)
The vertical rod/tube bundle geometry has a wide variety of industrial applications. Typical examples are the core of light water nuclear reactors (LWR) and vertical tube steam generators. In the core of a LWR, primarily coolant flows upward but their also exist a flow in lateral direction, called crossflow, in the gaps in between the sub...
doctoral thesis 2011
document
Hrachowitz, M. (author), Soulsby, C. (author), Tetzlaff, D. (author), Malcolm, I.A. (author), Schoups, G. (author)
In hydrological tracer studies, the gamma distribution can serve as an appropriate transit time distribution (TTD) as it allows more flexibility to account for nonlinearities in the behavior of catchment systems than the more commonly used exponential distribution. However, it is unclear which physical interpretation can be ascribed to its two...
journal article 2010
document
Ghaemi, S. (author), Schmidt-Ott, A. (author), Scarano, F. (author)
The potential application of aggregates of nanoparticles for high-speed flow diagnostics is investigated. Aluminum nanoparticles around 10 nm in diameter are produced by spark discharge in argon gas. Through rapid coagulation and oxidation, aggregates of small effective density are formed. They are characterized by microscopy and their...
journal article 2010
document
Brasser, H.J. (author)
Silicon (Si) is omnipresent in nature, and it is involved in important but diverse roles in a broad range of organisms, including diatoms, higher plants and humans. Some organisms, like the diatoms, need high amounts of silicon, and master silicon chemistry to a high extend using several enzymes. Other organisms which need silicon as an...
doctoral thesis 2009
document
Aboka, F.O. (author)
doctoral thesis 2008
document
Vink, C. (author), Leunk, I. (author), Cirkel, D.G. (author)
Voorliggende pilot studie 'Borgharen' van het project Stedelijk Waterbeheer en Drinkwaterwinning heeft tot doel de in de eerste fase van het project verworven inzichten en ontwikkelde methodenl te toetsen aan de praktijk. De locatiekeuze van de studie is gebaseerd op de nabijheid en omvang van stedelijk gebied in het intrekgebied van de winning...
report 2007
document
Berentsen, C.W.J. (author), Van Kruijsdijk, C.P.J.W. (author), Verlaan, M.L. (author)
journal article 2007
document
Anonymous, A. (author)
The use of mineral magnetic concentration data as an innovative means of monitoring sediment transport and sediment properties in marine, estuarine and fluvial environments has been well documented in the past. Mineral magnetic measurements are now considered a routine form of analysis when investigating the compositional properties of rocks,...
report 2005
document
Nguyen, Q. (author)
doctoral thesis 2004
document
Roelfzema, A. (author), Polhuys, J.M. (author)
report 1979
document
Glerum, H.L. (author)
Door de vakgroep Rivier en Verkeerswaterbouwkunde wordt onderzoek uitgevoerd met betrekking tot de bodemligging in rivierbochten. Hiertoe worden proeven uitgevoerd in een gekromde goot in het laboratorium voor vloeistofmechanica. Een belangrijk facet hierbij is de verdeling van het zandtransport over de breedte. Onderzocht wordt op het ogenblik...
report 1978
document
Eysink, W.D. (author)
report 1974
document
De Vries, M. (author)
The quantitative determination of bed-material-transport by means of tracers has been considered. For a stationary-stochastical transport-condition the dispersion of tracers has been described by a diffusion-equation of the gradienttype. The parameters of the dispersion-model are derived from the measured concentrations by a least-squares...
doctoral thesis 1966
document
Prych, E.A. (author), Hubbell, D.W. (author), Glenn, J.L. (author)
Columbia River estuary is being conducted by the U.S . Geological Survey. The necessity for information on water discharge, suspended and bed sediments, and radioactivity prompted the development of new measurement techniques and equipment suitable for estuarine conditions. Flow velocities and directions throughout the entire depth at a single...
report 1965
Searched for: subject:"tracers"
(1 - 20 of 20)