Open AccessTO THE PROBLEM OF TOTAL EVALUATING OF DREDGING IMPACT ON VARIOUS SYSTEMATIC GROUPS OF AQUATIC BIOLOGICAL RESOURCES OF THE NOVOTROITSK RESERVOIR IN THE STAVROPOL REGION
Author(s) -
Oleg Sergeyevich Denisenko
Publication year - 2019
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta. seriâ: rybnoe hozâjstvo
Language(s) - English
Resource type - Journals
eISSN - 2309-978X
pISSN - 2073-5529
DOI - 10.24143/2073-5529-2019-2-33-43
Subject(s) - dredging , siltation , environmental science , silt , sediment , hydrology (agriculture) , pollution , aquatic ecosystem , biota , water resource management , ecology , geology , oceanography , geotechnical engineering , paleontology , biology
The article highlights the poor ecological conditions of the Novotroitsk reservoir in the Stavropol Territory due to its intensive siltation because of the erosion of the banks and riverbed of the Egolik river, forming extensive stagnant zones and waterlogging of individual sections and secondary organic pollution of the reservoir, which necessitated a set of measures for hydromechanical cleaning of the reservoir bottom from silt sediments. There have been given the results of comprehensive studies of the possible impact of dredging by hydro-mechanization using pile-anchor dredger “350-50L” on the aquatic biological resources of the Novotroitsk reservoir. The hydrological, hydrobiological and ichthyological characteristics of the biota of the Novotroitsk reservoir are given, the technological solutions used in the course of dredging are fully described, the influence of the dredging on various systematic groups of hydrobionts of the reservoir is considered. According to the current regulatory legal acts of the Russian Federation in the fisheries and saving aquatic biological resources, there has been carried out calculation of harm caused to the aquatic biological resources. In view of the research results, the main features of the negative impact have been identified and the total amount of harm caused to the aquatic biological resources of the Novotroitsk has been calculated reservoir in natural terms. Using a certified computer model of IMRV “Potok” 1.0 there has been conducted simulation mathematical modeling of propagation and sedimentation of additional turbidity. The values of change variability of the suspended solids concentrations depending on the distance, the integral volumes of suspension tails and redeposition areas of turbidity zones on the bottom of the Novotroitsk reservoir relative to the month of conducting the work and to the seizures of the extracted soil have been calculated. Various compensatory measures for restoration of water bioresource losses have been developed.