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1

Digitale Medien

A hydroclimatological model of areal drought

Bogardi, I. ; Matyasovszky, I. ; Bardossy, A. ; [weitere]

Amsterdam : Elsevier

Journal of Hydrology 153 (1994), S. 245-264

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ISSN: 0022-1694

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1016/0022-1694(94)90194-5

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2

Digitale Medien

Imprecise (fuzzy) information in geostatistics (1988)

Bardossy, A. ; Bogardi, I. ; Kelly, W. E.

Springer

Mathematical geology 20 (1988), S. 287-311

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ISSN: 1573-8868

Schlagwort(e): fuzzy sets ; geostatistics ; methodology ; application ; permeability prediction ; soil liner

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract A methodology based on fuzzy set theory for the utilization of imprecise data in geostatistics is presented. A common problem preventing a broader use of geostatistics has been the insufficient amount of accurate measurement data. In certain cases, additional but uncertain (soft) information is available and can be encoded as subjective probabilities, and then the soft kriging method can be applied (Journel, 1986). In other cases, a fuzzy encoding of soft information may be more realistic and simplify the numerical calculations. Imprecise (fuzzy) spatial information on the possible variogram is integrated into a single variogram which is used in a fuzzy kriging procedure. The overall uncertainty of prediction is represented by the estimation variance and the calculated membership function for each kriged point. The methodology is applied to the permeability prediction of a soil liner for hazardous waste containment. The available number of hard measurement data (20) was not enough for a classical geostatistical analysis. An additional 20 soft data made it possible to prepare kriged contour maps using the fuzzy geostatistical procedure.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00892981

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3

Digitale Medien

Kriging with imprecise (fuzzy) variograms. I: Theory (1990)

Bardossy, A. ; Bogardi, I. ; Kelly, W. E.

Springer

Mathematical geology 22 (1990), S. 63-79

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ISSN: 1573-8868

Schlagwort(e): kriging ; variogram ; fuzzy set theory ; prior information ; methodology

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract Imprecise variogram parameters are modeled with fuzzy set theory. The fit of a variogram model to experimental variograms is often subjective. The “accuracy” of the fit is modeled with imprecise variogram parameters. Measurement data often are insufficient to create “good” experimental variograms. In this case, prior knowledge and experience can contribute to determination of the variogram model parameters. A methodology for kriging with imprecise variogram parameters is developed. Both kriged values and estimation variances are calculated as fuzzy numbers and characterized by their membership functions. Besides estimation variance, the membership functions are used to create another uncertainty measure. This measure depends on both homogeneity and configuration of the data.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00890297

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4

Digitale Medien

Kriging with imprecise (fuzzy) variograms. II: Application (1990)

Bardossy, A. ; Bogardi, I. ; Kelly, W. E.

Springer

Mathematical geology 22 (1990), S. 81-94

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ISSN: 1573-8868

Schlagwort(e): application ; permeability prediction ; soil liner ; kriging ; variogram ; fuzzy set theory

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract The geostatistical analysis of soil liner permeability is based on 20 measurements and imprecise prior information on nugget effect, sill, and range of the unknown variogram. Using this information, membership functions for variogram parameters are assessed and the fuzzy variogram is constructed. Both kriging estimates and estimation variances are calculated as fuzzy numbers from the fuzzy variogram and data points. Contour maps are presented, indicating values of the kriged permeability and the estimation variance corresponding to selected membership values called levels.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00890298

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5

Digitale Medien

Comparison of geostatistical calculations with the results of open pit mining at the Iharkut bauxite district, Hungary: A case study (1984)

Bárdossy, A. ; Bárdossy, Gy.

Springer

Mathematical geology 16 (1984), S. 173-191

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ISSN: 1573-8868

Schlagwort(e): geostatistics ; reserve evaluation ; bauxite prospecting ; open-pit mining

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract Geostatistical calculations were carried out on two completely exhausted open-pit bauxite mines in the Iharkut bauxite district, Hungary. Fictitious regular drilling grids were laid on the maps, and horizontal variograms were calculated for drilling grids evaluating the bauxite surface, footwall surface, and bauxite thickness. Point kriging was carried out for all three parameters. Bauxite reserves were calculated using block kriging for bauxite thickness. The total estimation variance of the reserves has been established. Results were compared with real reserves obtained from the mine maps.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01032215

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6

Digitale Medien

Local temperature estimation under climate change (1994)

Matyasovszky, I. ; Bogardi, I. ; Bardossy, A. ; [weitere]

Springer

Theoretical and applied climatology 50 (1994), S. 1-13

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ISSN: 1434-4483

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Summary A methodology to estimate the space-time distribution of daily mean temperature under climate change is developed and applied to a central Nebraska case study. The approach is based on the analysis of the Markov properties of atmospheric circulation pattern (CP) types, and a stochastic linkage between daily (here 500hPa) CP types and daily mean temperatures. Historical data and general circulation model (GCM) output of daily CP corresponding to 1 × CO2 and 2 × CO2 scenarios are considered. The relationship between spatially averaged geopotential height of the 500 hPa surface — within each CP type — and daily mean temperature is described by a nonparametric regression technique. Time series of daily mean temperatures corresponding to each of these cases are simulated and their statistical properties are compared. Under the climate of central Nebraska, the space-time response of daily mean temperature to global climate change is variable. In general, a warmer climate appears to cause about 5°C increase in the winter months, a smaller increase in other months with no change in July and August. The sensitivity of the results to the GCM utilized should be considered.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00864897

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7

Digitale Medien

Detection of climate change in Europe by analyzing European atmospheric circulation patterns from 1881 to 1989 (1990)

Bárdossy, A. ; Caspary, H. J.

Springer

Theoretical and applied climatology 42 (1990), S. 155-167

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ISSN: 1434-4483

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Summary The time series of classified European atmospheric circulation patterns for the time period of 1881–1989 are analyzed. Frequencies of several circulation types changed considerably during the last years, showing extremes never reached before. Changes can be observed both in the annual frequencies and in the seasonal ones for many circulation types. The time series were analyzed for homogeneity using non-parametric statistical methods. The annual cycle shows an increase of the frequency of zonal circulations in winter (December and January) and a corresponding decrease of cold meridional circulations. The climatological consequences of this are more frequent mild and humid winters in Central Europe, with precipitation mostly falling as rain. Change points in the series occurred with high probability during the seventies. Examples demonstrate the coupling of circulation patterns to temperature and precipitation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00866871

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