Searched for: subject%3A%22hydrological%255C%2Bmodeling%22
(1 - 9 of 9)
document
Witte, J.P.M. (author), Zaadnoordijk, W.J. (author), Buyse, J.J. (author)
Since the nineteen fifties, groundwater levels in the Netherlands dropped more than as simulated by hydrological models. In the rural sandy part of the Netherlands, the difference amounts to approximately 0.3 m on average. The answer to the question of what or who caused this 'background decline' of groundwater tables may have juridical and...
article 2019
document
Visser, A. (author), Schaap, J.D. (author), Broers, H.P. (author), Bierkens, M.F.P. (author), TNO Bouw en Ondergrond (author)
The production of N2 gas by denitrification may lead to the appearance of a gas phase below the water table prohibiting the conservative transport of tracer gases required for groundwater dating. We used a two-phase flow and transport model (STOMP) to study the reliability of 3H/3He, CFCs and SF6 as groundwater age tracers under agricultural...
article 2009
document
Visser, A. (author), Schaap, J.D. (author), Leijnse, T. (author), Broers, H.P. (author), Bierkens, M.F.P. (author), TNO Bouw en Ondergrond (author)
Degassing of groundwater by excess denitrification of agricultural pollution complicates the interpretation of 3H/3He data and hinders the estimation of travel times in nitrate pollution studies. In this study we used a two-phase flow and transport model (STOMP) to evaluate the method presented by Visser (2007a) to interpret degassed 3H/ 3He...
conference paper 2008
document
Brink, C.v.d. (author), Zaadnoordijk, W.J. (author), Burgers, S. (author), Griffioen, J. (author), TNO Bouw en Ondergrond (author)
Groundwater quality management relies more and more on models in recent years. These models are used to predict the risk of groundwater contamination for various land uses. This paper presents an assessment of uncertainties and sensitivities to input parameters for a regional model. The model had been set up to improve and facilitate the...
article 2008
document
van der Grift, B. (author), Griffioen, J. (author), TNO Bouw en Ondergrond (author)
Historic emissions from ore smelters typically cause regional soil contamination. We developed a modelling approach to assess the impact of such contamination on groundwater and surface water load, coupling unsaturated zone leaching modelling with 3D groundwater transport modelling. Both historic and predictive modelling were performed, using a...
article 2008
document
Noomen, M. (author), Bremmer, C. (author), Vermooten, S. (author), Kukuric, N. (author), van Beek, R. (author), TNO Bouw en Ondergrond (author)
This paper describes the initial stage of the assimilation of GRACE and ERS-1 and ERS-2 imagery with a global hydrological model. The outcome of the model will be evaluated with groundwater storage estimates based on GRACE data as well as with soil moisture estimates based on ERS-1 and ERS-2 scatterometer data.
conference paper 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
document
Schuurmans, J.M. (author), Bierkens, M.F.P. (author), TNO Bouw en Ondergrond (author)
We investigate the effect of spatial variability of daily rainfall on soil moisture, groundwater level and discharge using a physically-based, fully-distributed hydrological model. We focus on the effect of rainfall spatial variability on day-to-day variability of the interior catchment response, as well as on its effect on the general...
article 2006
document
Bierkens, M.F.P. (author), Knotters, M. (author), van Geer, F.C. (author), Netherlands Geological Survey (author)
A method is presented to calibrate transfer function-noise (TFN) models, operating at the same frequency as the input (auxiliary) variables, to sparsely or irregularly observed time series of the output (target) variable. Once calibrated, the TFN models can be used to predict or simulate the output variable at the same frequency as the input...
article 1999
Searched for: subject%3A%22hydrological%255C%2Bmodeling%22
(1 - 9 of 9)