Searched for: author%3A%22van+Geer%2C+F.%22
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document
van Geer, F. (author), Rozemeijer, J. (author), van der Velde, Y. (author), Broers, H.P. (author), de Rooij, G. (author)
As part of two PhD projects, we installed ion-selective electrodes and passive samplers for monitoring nitrate concentrations in a 7 km 2 catchment and compared the results to grab samples. We also monitored nitrate concentrations at the catchment outlet. We tested the effectiveness of these monitoring approaches to estimate the long-term...
conference paper 2011
document
Rozemeijer, J. (author), van der Velde, Y. (author), de Jonge, H. (author), van Geer, F. (author), Broers, H.-P. (author), Bierkens, M. (author), TNO Bouw en Ondergrond (author)
We present a field based testing, optimization, and evaluation study of the SorbiCell sampler (SC-sampler); a new passive sampling technique that measures average concentrations over longer periods of time (days to months) for various substances. We tested the SC-sampler within a catchment-scale monitoring study of NO<sub>3</sub> and P...
article 2010
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Højberg, A.L. (author), Refsgaard, J.C. (author), van Geer, F. (author), Jørgensen, L.F. (author), Zsuffa, I. (author), TNO Bouw en Ondergrond (author)
Implementation of the EU Water Framework Directive (WFD) poses many new challenges to European water managers. Monitoring programmes play a key role to assess the status and identify possible trends in the environmental conditions of river basins; to gain new knowledge on water processes and to assess to which extent implemented measures...
article 2007
document
van Geer, F. (author), Marsman, A. (author), Janssen, G.M.C.M. (author), TNO Bouw en Ondergrond (author)
Usually the design of the monitoring system is based on the relation between the monitoring effort and the uncertainty of the information. Often the estimation error standard deviation is used as a criterion for the design. Despite the fact that, for scientists, the standard deviation as a measure of uncertainty is a logical criterion, water...
conference paper 2007
Searched for: author%3A%22van+Geer%2C+F.%22
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