THE ANALYSIS OF RELATIONSHIPS BETWEEN ANNUAL PRECIPITATION AND RELIEF AND LANDSCAPE CHARACTERISTICS IN THE CARPATHIAN REGION OF UKRAINE
Journal Title: Вісник Львівського університету. Серія географічна - Year 2015, Vol 49, Issue
Abstract
The paper deals with the statistical analysis of relationships between the spatial distribution of precipitation values in the Carpathian region of Ukraine and the spatially distributed relief and landscape parameters. Processed data of 20 weather stations have been a data source of annual precipitation data for 1961–1991 period, while SRTM elevation dataset has been used as a source of spatial data on relief parameters. Step-wise multiple regression has revealed the set of parameters manifesting the strongest relationship with the precipitation distribution. This set includes following parameters: terrain roughness, local and focal elevation, and aspect factor for NW/SE direction; the overall relationship is highly statistically significant. The terrain roughness has appeared to be the single parameter with the strongest effect on precipitation values, followed by the local and focal elevation and the aspect factor. ANOVA results were much more modest in comparison with the multiple regression, suggesting that the quantitative spatial modeling, which uses relief parameters as predictors, produces much more reliable predictions of the precipitation spatial distribution than just averaging the precipitation values round the delineated natural regions. ANCOVA results show that the interaction between the quantitative and numerical predictors is statistically significant with the p-value of less than 0.01, suggesting that belonging to natural regions can moderate the impact of quantitative relief parameters. Thus considering the belonging to natural regions significantly improves the final prediction, when used in addition to numerical relief parameters.
Authors and Affiliations
Alexander Mkrtchian, Pavlo Shuber
Keywords
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