Purpose: to analyze the soil-climatic and anthropogenic reasons of decreasing drainage efficiency of closed pottery tubular drainage on the reclaimed lands of the North-West of Russia under the observed local weather conditions against the background of global climate changes.
Materials and methods. The objects of research are seasonal precipitation regimes, reclaimed lands and drainage systems of closed tubular drainage. The methods of applied mathematical statistics, the ensemble method of processing and generalization of climate forecasts of the Intergovernmental Panel on Climate Change (IPCC), modernized by the authors were used in research. Monitoring data on changes in the physical properties of soils of reclaimed lands during their long-term operation were obtained using laboratory agrophysical methods for studying samples taken in the field.
Results. It is shown that under the conditions of the observed climatic changes, the frequency, intensity and extremeness of atmospheric precipitation are increased. Long-term exploitation of lands with a leaching drainage regime is accompanied by changes in the hydrophysical properties of soils, for example, the coefficient of heterogeneity of the subsurface horizons of soils texture of automorphic genesis decreased from 26 to 6. The system “precipitation – soil – drainage” in climatically abnormal weather conditions exceeding the initial calculated precipitation level mode by 10–20 %, is unable to ensure the removal of excess moisture from the root layer.
Conclusions: when creating and reconstructing such reclamation drainage systems it is recommended to take into account the tendencies of changes in the spatial-temporal statistical structure of precipitation and to design technologies for regulating the water regime with systems for intercepting and diverting surface runoff on such reclaimed lands.
DOI: 10.31774/2222-1816-2020-4-205-226
climate change; precipitation; turbular drainage systems; hydrophysical properties of soils; statistical analysis.
Analysis of the “precipitation – soil – drainage” system under the conditions of climate change in the North-West of Russia / I. B. Uskov, K. G. Moiseyev, M. V. Nikolaev, O. V. Kononenko, A. O. Uskov // Scientific Journal of Russian Scientific Research Institute of Land Improvement Problems [Electronic resource]. – 2020. – № 4(40). – P. 205–226. – Mode of access: http:www.rosniipm-sm.ru/en/article?n=1167. – DOI: 10.31774/2222-1816-2020-4-205-226.
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