USE OF HYDROOPTICAL CHARACTERISTICS IN MONITORING THE STATUS OF THE RESERVOIR ECOSYSTEM
V.I. MANKOVSKY1, P.P. SHERSTYANKIN2
1Marine Hydrophysical Institute, Russian Academy of Sciences, 299011, Sevastopol, ul. Kapitanskaya, 2, Russia
mankovskiy@mhi-ras.ru
2Limnological Institute, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, ul. Ulan-Batorskaya, 3, Russia
ppsherst@lin.irk.ru
Keywords: показатель ослабления света, глубина видимости белого диска, взвешенное вещество, хлорофилл, растворенное органическое вещество, эвфотический слой, beam attenuation coefficient, Secchi depth, suspended matter, chlorophyll, dissolved organic matter, euphotic layer thickness
Abstract
Use of hydrooptical characteristics in monitoring of the reservoir ecosystem is investigated. Two basic characteristics which are most commonly used for purposes of ecological monitoring having regard to information content and ease of measurements are considered: the beam attenuation coefficient ε , the and Secchi disc depth ZSD. Theoretical analysis shows a relationship of ε and ZSD with content of suspended matter and chlorophyll in water. It is concluded, however, that correct theoretical calcula tions of the content of these substances is not possible to correctly calculate these substances in a theoretical way from ε and ZSD. In this context, empirical relationships of suspended matter and chlorophyll concentrations with hydrooptical characteristics are used for monitoring purposes. These relationships are regional in character, which is accounted for by the regional composition of suspended matter and by the intracellular concentration of pigments in algae. Examples of empirical relationships of the sus pended matter and chlorophyll concentrations with the beam attenuation coefficient and Secchi depth in Lake Baikal, the Black Bea and the tropical waters of the Atlantic waters are given. It is found that in addition to the content of suspended matter and chlorophyll in reservoirs, it is important, for biological purposes, to know the thickness of the euphotic layer for total quantum irradiation Heuph.quant. Examples of the determination of the euphotic layer thickness for total quantum irradiation Heuph.quant using Secchi depth for different reservoirs are provided.
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