scholarly journals CALCULATING EVAPOTRANSPIRATION FOR THE LAKE LADOGA CATCHMENT AREA

2021 ◽  
pp. 146
Author(s):  
Анна Мурадовна Расулова ◽  
Anna Rasulova
Keyword(s):  
Catchment Area ◽  
Lake Ladoga

Sphagnum mosses of Lake Germanovskoe catchment area («Valaam Archipelago» Natural Park)

2015 ◽  
Vol 49 ◽  
pp. 328-344
Author(s):  
S. A. Komolova ◽  
A. B. Stepanova ◽  
E. Yu. Kuzmina ◽  
L. E. Dmitricheva ◽  
K. A. Kozitskaya
Keyword(s):  
Plant Communities ◽  
Catchment Area ◽  
Lake Ladoga ◽  
Chemical Characteristics ◽  
Sphagnum Mosses ◽  
Ecological Characteristics ◽  
Natural Park ◽  
First Time

The list of sphagnum mosses of the swamped part of Lake Germanovskoe catchment area («Valaam Archipelago» Natural Park) is provided for the first time. The Valaam Archipelago is located in the northern part of Lake Ladoga, in Republic of Karelia. The largest Valaam Island takes over 2/3 of the archipelago area — 27.8 km2. The ecological characteristics of sphagnum mosses are discussed. A detailed investigation of ecotopes and plant communities dominated by sphagnum mosses was conducted. The study of tree stands, herb and moss layers, soils and analysis of Lake Germanovskoe hydro-chemical characteristics were carried out to define the conditions of Sphagnum habitats. Different sphagnum mosses dominate in ecotopes with various regime of moisture. The swamped part of Lake Germanovskoe catchment area is determined as having mesotrophic characteristics. Аnalysis of the ecological characteristics of sphagnum mosses shows the same result.

scholarly journals Sediment Runoff and Water Turbidity of the Main Tributaries of the Lake Ladoga

2021 ◽  
pp. 71-84
Author(s):  
Keyword(s):  
Catchment Area ◽  
River Flow ◽  
Analytical Formula ◽  
Water Area ◽  
Sediment Runoff ◽  
Lake Ladoga ◽  
Good Correspondence ◽  
Ladoga Lake ◽  
Sediment Flow ◽  
Lake Catchment

The vast catchment area of the Lake Ladoga is characterized by variety of underlying surface types and a complex hydrographic network. The processes of eutrophication of the southern littoral areas of the Lake Ladoga determine the relevance of assessing the removal of solid matter from the river flow to the estuaries of the tributaries of the Ladoga. Observations of sediment runoff of the main tributaries the Lake Ladoga were not carried out. In this regard, for each tributary were selected rivers-analogues the main criteria in the selection was the slope, the grain size of sediments and the catchment area (water availability). The modeling of annual solid runoff and turbidity of the Ladoga tributaries is based on an analytical formula for sediment flow by M.V. Shmakova and a stochastic model of annual solid runoff (M.V. Shmakova). According to the calculations, the annual flow of sediment entering the Ladoga water area is about 432 thousand t/year. The main sources of sediment are three major tributaries of the Lake Ladoga – the Svir, Volkhov and Vuoksa rivers, which account for 253 thousand t/year or 59 % of the total amount of sediment received in the lake. However, these watercourses have the smallest annual module solid flow, due to retention of sediment of backwater areas before hydroelectric dams on these rivers and as a consequence, a decrease in the overall sediment discharge. At the same time, the average annual solid runoff modulus for the Ladoga lake catchment area is 1.53 t/(km2·year), which corresponds well to the previous estimate of this value for the territory under consideration. The analysis of the annual module of solid runoff showed a good correspondence between the obtained values of this value and the conditions for the formation of solid runoff in the catchment, the characteristics of its soils.

Diatoms in the Early Valdai (Weichselian) sediments in Lake Ladoga basin

2019 ◽  
pp. 225-228
Author(s):  
Anna V. Ludikova
Keyword(s):  
Species Diversity ◽  
High Energy ◽  
Lake Ladoga ◽  
Diatom Assemblages ◽  
Marine Diatoms ◽  
Selective Preservation

The pioneer diatom study of the Early Weichselian (Valdai) sediments in Lake Ladoga basin was performed. The specifics of the diatom assemblages (co-occurrence of ecologically incompatible taxa, poor species diversity, low diatom concentration and selective preservation) suggest that during the Early Weichselian time intense erosion of previously deposited marine Eemian (Mikulino) sediments prevailed, which resulted in re-deposition of marine diatoms. The sedimentation took place in high-energy environments unfavorable for diatom accumulation and preservation.

Present Condition Analysis and Design of Sewer Collector Recovery

2020 ◽  
Vol 15 (3) ◽  
pp. 184-195
Author(s):  
Réka Csicsaiová ◽  
Ivana Marko ◽  
Jaroslav Hrudka ◽  
Ivona Škultétyová ◽  
Štefan Stanko
Keyword(s):  
Catchment Area ◽  
Present Condition ◽  
Urban Catchment ◽  
Analysis And Design ◽  
Current State ◽  
Sewer Network

The aim of the study is to assess the hydraulic capacity of the sewer network and sewer collector recovery in the urban catchment area of Trnava.The analysis focuses on the evaluation of situations with different precipitation frequencies. Elaboration consists of modeling the current state of the assessed sewer collector B and subsequent loading of this collector by several block rainfalls. Based on the results of the analysis, the recovery of the sewer network proposed.

On Riccia marginata and related species (Ricciaceae, Marchantiophyta)

2012 ◽  
Vol 46 ◽  
pp. 298-305 ◽  
Author(s):  
A. D. Potemkin ◽  
T. Ahti
Keyword(s):  
Related Species ◽  
Lake Ladoga ◽  
Leningrad Region ◽  
Sem Images ◽  
North Shore ◽  
The North ◽  
Molecular Studies ◽  
The Future ◽  
The Town

Riccia marginata Lindb. was described by S. O. Lindberg (1877) from the outskirts of the town of Sortavala near the north shore of Lake Ladoga, Republic of Karelia, Russia. The species has been forgotten in most recent liverwort accounts of Europe, including Russia. Lectotypification of R. marginata is provided. R. marginata shares most characters with R. beyrichiana Hampe ex Lehm. It differs from “typical” plants of R. beyrichiana in having smaller spores, with ± distinctly finely areolate to roughly papillose proximal surfaces and a narrower and shorter thallus, as well as in scarcity or absence of marginal hairs. It may represent continental populations of the suboceanic-submediterranean R. beyrichiana, known in Russia from the Leningrad Region and Karelia only. The variability of spore surfaces in R. beyrichiana is discussed and illustrated by SEM images. A comparison with the spores of R. bifurca Hoffm. is provided. The question how distinct R. marginata is from R. beyrichiana needs to be clarified by molecular studies in the future, when adequate material is available. R. marginata is for the time being, provisionally, included in R. beyrichiana.

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