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The size of the basic unit in geographical analysis

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Suchożebrski J., Kwiatkowska J. M.
Miscellanea Geographica. Regional Studies on Development
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2004
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vol. 11
151-160
EN
In geographical analysis such as mathematical classification and modeling, the study area is divided into a network of basic (quasi-homogenous) units. A technique often used in the delimitation of the basic unit to be analyzed is the division of the study area into a network of uniform geometrical figures (block-centered grid). This article presents two objective methods for dividing the surface area of the study region into a network of basic units. The geometric method makes it possible to determine the optimal size of the basic unit, relative to the surface area being analyzed. This method may be used in analysis conducted on a regional scale, in which case the analysis and the results are characterized by a greater degree of generalization. Geostatistical methods (semivariance analysis and nearest-neighbor analysis) make it possible to determine the size of the cell in the grid of quasi-homogenous units, based on the spatial variation of elements in the natural environment and on the placement of data points. These methods can be recommended for the analysis of small areas (e.g. small drainage areas), when highly detailed data and results are required.
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A method for assessing the conditions of migration of pollutants to the groundwater on the agriculturally used lowland areas

100%
Suchożebrski J.
Miscellanea Geographica. Regional Studies on Development
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2002
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vol. 10
175-184
3
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Regional conditions for maximum probable discharge in Poland's rivers

51%
Gutry-Korycka M., Woronko D., Suchożebrski J., Mikulska M.
Miscellanea Geographica. Regional Studies on Development
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2010
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vol. 14
145-167
EN
The purpose of this study was to obtain and verify the methods of catchment regionalization for annual maximum discharge. An identification of Polish rivers was performed based on regional frequency analyses including recognition of regions homogeneous with respect to their physical properties and river flow parameters. The results suggest a division into two regional groups: mountain and lowland catchments. Statistical tests verify the regionalization obtained and allow to calculate regional probability curves for these two catchment groups. The results obtained may be helpful in the analysis of floods in ungauged catchments and in those where hydrological observations were performed during a short period, especially when the dependence of the maximum probable flows on their physico-geographical features in catchments under analysis has been proved.
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