Академическое издательство «Гео»

Keywords: potential soil loss, universal erosion equation, erosion regionalization, modulus of flow of suspended sediments, coefficient of ply, transformation of soil loss products to flow of suspended sediments.



GEOGRAPHY AND NATURAL RESOURCES, 2016, № 2, p. 132-141

Erosion regionalization of the territory of Kamchatka krai

L.V. Kuksina and N.I. Alekseevskii

ludmilakuksina@gmail.com

An erosion regionalization of the territory of Kamchatka krai has been carried out. A quantitative assessment of the main factors governing the erosion intensity on the drainage basin was made according to the Wischmeier–Smith theoretical concept. These factors include the characteristics of topography, atmospheric precipitation, and soil-vegetation cover. The value of the erosion potential of topography varies over a broad range from 1.6 for flat territories to 837 in volcanic areas of Kamchatka. It was found that the formation conditions for potential soil loss are relatively uniform for 26 erosion areas within Kamchatka krai. These areas were enlarged to 11 in view of the inadequate density of the observation network for characteristics of the runoff of suspended sediments. The value of potential soil loss on the region’s territory varies from <50 t/km2 in the north to >5000 t/km2 in the volcanic areas. The modulus of flow of suspended sediments increases from west to east approaching the areas of occurrence of active volcanism. An assessment is made of the coefficients of sediment supply characterizing the correspondence between the moduli of potential soil loss and the runoff of suspended sediments. Their disagreement is associated with an accumulation of a portion of soil loss products on the way of their transport from the formation zones in the region of long-lasting accumulation. The coefficient of supply of soil loss products along the stretch of the Kamchatka river channel is in inverse proportion to the drainage area and decreases from 19 to 1 % with an increase in the drainage area from 100 to 45 000 km2.

Keywords: potential soil loss, universal erosion equation, erosion regionalization, modulus of flow of suspended sediments, coefficient of supply, transformation of soil loss products to flow of suspended sediments.
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