Assessment of the technogenic load by the intensity of dredging operations on the rolling sections of the Ob River

Abstract

The object of the study is to carry out transit dredging operations in the bed of the Ob River over a long period of time (2000-2020). The frequency and volumes of dredging on those rifts that created difficulties for navigation are analyzed. Based on extensive primary data, such parameters as: the number of developments during the period under review, the average volume per development, the total volume of displaced soil for each roll, the number of periods of three or more years in which dredging was carried out on the roll) were calculated. The proposed parameters have technical, economic and environmental significance. It was found that during the specified period dredging was required on the rifts. The rifts in the section of the Approach Channel of the Novosibirsk hydroelectric power station gateway - the mouth of the Tom River are most affected. A number of rifts have been dredged almost continuously for 5-7 years or more. To establish a relationship between the indicators, correlation coefficients (r_xy) were calculated in the pairs "Number of developments" – "Total volume" and "Number of developments" – "Average volume". It was found that there is a significant positive relationship between the number of developments and the total volume of displaced soil. There is no equally strong connection between the number of developments on the roll and the average volume of one slot. The disadvantages and advantages of the proposed method of evaluation are noted.