ФОРМИРОВАНИЕ ИЗМЕНЧИВОСТИ КАЧЕСТВА СТОКА В ВЕРХОВЬЯХ РЕКИ ЛУГИ В МЕЖГОДОВОМ И КРАТКОСРОЧНОМ МАСШТАБАХ ВРЕМЕНИ. ЧАСТЬ 1. МЕЖГОДОВАЯ ИЗМЕНЧИВОСТЬ

Э.А. Румянцева; Н.Н. Бобровицкая

doi:10.34753/HS.2021.3.1.39

FORMATION OF VARIABILITY OF FLOW QUALITY IN THE TOP OF THE LUGA RIVER IN INTER-ANNUAL AND SHORT-TERM TIME. PART 1. INTERANNUAL VARIABILITY

Authors

El'vira А. Rumyantseva Federal State Budgetary Institution "State Hydrological Institute", St. Petersburg, Russia , ФГБУ «Государственный гидрологический институт», г. Санкт Петербург, Россия
Nelly N. Bobrovitskaya Federal State Budgetary Institution "State Hydrological Institute", St. Petersburg, Russia , ФГБУ «Государственный гидрологический институт», г. Санкт Петербург, Россия

DOI:

https://doi.org/10.34753/HS.2021.3.1.39

+ Keywords

variability of flow quality, routine observations, polluted runoff, factors of runoff quality formation, factor analysis, proportion of polluted runoff volumes

+ Abstract

The study of the interannual variability of the flow quality of the Luga River was carried out in the section of the village of Tolmachevo 3 km downstream of the confluence of the Oredezh River according to the data of the North-West UGMS 2000–2017. Water pollution in the runoff was assessed in accordance with RD 52.24.643-2002. For 11 years out of 18, the water in the effluent was “very polluted”, 2 years – “dirty”, 3 – “polluted”, and only in 2016 and 2017 – “slightly polluted”. The use of factor analysis showed that the variation of V_zag% of the runoff of the most polluted water of classes 3 and 4 is influenced by factor 1 (33% of the total variance), which is associated with the value of the highest water discharge. Factor 2 (22%) has a positive relationship with the variation in average and lowest water discharges. Four components Mn²⁺, Fe_tot, COD and Cu²⁺ are distinguished, polluting most of the volume of water flow annually. Factor 1 (21%) affects V_zag% of water contaminated with single components. It has a negative relationship with V_zag% of water, the oxygen saturation of which is below normal. This, possibly, can serve as a marker of the contribution of the Oredezh River to the formation of runoff in the section of the village of Tolmachevo. Factor 2 (18%) showed an inverse relationship between the variation of V_zag% of the runoff of water contaminated with Cu²⁺ and the average annual water discharges

+ Author Biographies

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FORMATION OF VARIABILITY OF FLOW QUALITY IN THE TOP OF THE LUGA RIVER IN INTER-ANNUAL AND SHORT-TERM TIME. PART 1. INTERANNUAL VARIABILITY

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