- document
-
Bolte, J.F.B. (author), Prein, R.J. (author), Verschuur, D.J. (author), Thorbecke, J.W. (author), Winthaegen, P.L.A. (author), Netherlands Geological Survey (author)The Common Focal Point (CFP) technology involves the estimation of one-way travel time operators, describing the propagation effects from a selection of gridpoints at reflecting interfaces towards the surface locations. These operators can be obtained from the data without using any velocity depth model. These operators can be used in several...conference paper 2000
- document
-
Reis, M.A. (author), Alves, L.C. (author), Freitas, M.C. (author), van Os, B. (author), Wolterbeek, H.T. (author), Netherlands Geological Survey (author)Parmelia sulcata transplants, collected in a non-polluted area, were exposed to new atmospheric conditions at six stations, of which five were located near power plants and one at an unpolluted area. Data were collected for a 1-year period, on rainfall, airborne particulates, elemental deposition and on lichen elemental composition. The study...article 1999
- 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
- document
-
van Weert, F.H.A. (author), van Gijssel, K. (author), Leijnse, A. (author), Boulton, G.S. (author), Netherlands Geological Survey (author)A large-scale hydrological model study is carried out to investigate the geohydrological responses to glacial climate conditions in Northwest Europe. The vertically integrated groundwater model is based on a supraregional hydrogeological model of the Cenozoic and Mesozoic subsurface in Northwest Europe. Three different layers are distinguished...article 1997
- document
-
Huisman, D.J. (author), Vermeulen, F.J.H. (author), Baker, J. (author), Veldkamp, A. (author), Kroonenberg, S.B. (author), Klaver, G.Th. (author), Netherlands Geological Survey (author)The natural variation in heavy metal contents of subsurface sediments in the southern Netherlands is described, based on a series of 820 bulk geochemical analyses. The detrital heavy metal contents of these sediments show linear correlations with Al as a result of their joint occurrence in phyllosilicates. Anomalous enrichments occur as a result...article 1997