EVALUATION OF THE ADEQUACY OF SPATIAL MODELING OF INTENSITY OF SOIL EROSION-ACCUMULATION ON THE BASIS OF PHYSICAL-STATISTICAL MODEL
Journal Title: Вісник Одеського національного університету. Географічні та геологічні науки - Year 2017, Vol 22, Issue 2
Abstract
Problem Statement and Purpose. The practice of soil conservation in the world and in Ukraine is based on empirical, mostly physical-statistical, models of soil erosion that do not impose excessive requirements on the quantity and quality of input data. However, the question of the adequacy of spatial modeling, estimation and forecast of erosion-accumulation of soil using even modern GIS-implemented versions of empirical models remains open. The aim of the study is to assess the adequacy of the spatial simulation of intensity of erosion-accumulation on slope on the basis of the physical-statistical model developed at the Odessa I. I. Mechnikov National University. Data & Methods. In connection with the lack of objective data on the spatial variability of intensity of erosion-accumulation within the slopes as an adequate model of the spatial distribution of erosion-accumulation in the paper used the results of the spatial modeling of soil erosion-accumulationb using the detailed theoretical «physically based» Limburg soil erosion model (LISEM). The assessment of model’s adequacy is performed on three test plots with an area of 7.5, 21.5 and 70 ha, located within the forest-steppe zone of the East European Plain. The assessment was carried out both on the basis of a visual comparison of the maps of the spatial distribution of erosion-accumulation, and using the correlation coefficient of signs, or the Fechner coefficient. Results. A visual comparison of the results of spatial modeling of erosionaccumulation of soil using the physical-statistical model of ONU and Limburg soil erosion model showed a high degree of correspondence between the spatial distributions obtained. This conclusion is also confirmed by high values of the Fechner coefficient for the pairs of spatial distributions of erosion-accumulation, which for all test areas are in the range 0.54-0.66. Taking into account the results of the earlier verification of the model using data of observations on soil washouts from slope watersheds and point data obtained by the radio cesium method and the magnetic tracers method, it can be argued that, despite very moderate input requirements oriented to standard and easily accessible information , physical-statistical empirical erosion-accumulation model developed in ONU adequately displays the results of erosion-accumulation process on a slope.
Authors and Affiliations
A. A. Svetlitchnyi, A. V. Pyatkova
Keywords
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