scholarly journals SPATIAL-TEMPORAL DYNAMICS OF BOTTOM COMMUNITIES OF THE VOLGUSHA RIVER

2019 ◽  
pp. 31-40
Author(s):  
Alina Igorevna Ivanova ◽  
Natalia Vladimirovna Kuznetsova
Keyword(s):  
Temporal Dynamics ◽  
Open Water ◽  
Temporal Organization ◽  
Water Bodies ◽  
Moscow Region ◽  
Small Rivers ◽  
Quantitative Composition ◽  
Toxic Substances ◽  
Quantitative Development ◽  
Composition Structure

The article highlights the problem of using information on the environmental conditions of water bodies for planning and conducting conservation measures. To understand the processes occurring in aquatic ecosystems, a promising direction appears the study of the composition, structure and spatial-temporal organization of zoobenthos, which is a sensitive indicator of contamination of water bodies with biogenic and toxic substances. There has been carried out the study of the main characteristics of zoobenthic communities of the Volgusha - one of the small rivers of the Moscow region, which flows on the territory of the state natural reserve of regional significance “Volgusha Valley and Paramonovsky Ravine” in the Dmitrov district of the Moscow region. There have been presented the results of a hydrobiological research of the Volgusha River carried out in the open water period in 2017-2018. A physiographic description of the Volgusha basin has been given. The qualitative and quantitative composition of the Volgusha bentofauna has been studied. There were revealed 60 species of zoobenthos belonging to 34 families, 14 orders, 5 classes, 3 types. The most widely there was represented Class Insecta numbering 42 species. There were found nine species of molluscs, four species of leeches, five species of oligochaetas. There have been singled out four groups associated to the substrate in the composition of zoobenthos: featurefile, litereally, pagefile and psammodiini. The spatial heterogeneity of hydrological and hydrochemical conditions throughout the Volgusha River caused by the terrain determines structural differences of zoobenthos, its composition and quantitative development, that is why it can serve as an indicator of water quality in different sectors of the river. There have been revealed evident seasonal changes in the composition of zoobenthos of the Volgusha River during the year and marked out zones of maximal anthropogenic interference.

scholarly journals Spatial and Temporal Dynamics of Urban Wetlands in an Indian Megacity over the Past 50 Years

2020 ◽  
Vol 12 (4) ◽  
pp. 662 ◽  
Author(s):  
Katja Brinkmann ◽  
Ellen Hoffmann ◽  
Andreas Buerkert
Keyword(s):  
Land Cover ◽  
Urban Areas ◽  
Temporal Dynamics ◽  
Open Water ◽  
Water Bodies ◽  
Annual Rainfall ◽  
Urban Wetlands ◽  
Landsat Images ◽  
Urban District ◽  
Wetland Area

Asian megacities have attracted much scientific attention in the context of global urbanization, but few quantitative studies analyze wetland transformation in the rural–urban interface. With its rampant growth and transformation from a tree-lined “Garden City” to a busy megalopolis with often-blocked highways and large built-up areas, Bengaluru (Karnataka, S-India) is a good example for assessing how urbanization has led to the acute degradation of wetlands. We therefore investigated long-term land cover and wetland changes from 1965 to 2018 based on an object-based classification of multi-temporal Corona and Landsat images. To quantify and compare the dynamics of open water surfaces and vegetation, we defined the potential wetland areas (PWA) along the rural–urban gradient and linked our analyses to an index describing the degree of urbanization (survey stratification index (SSI)). During the five decades studied, built-up areas in the Bengaluru Urban district increased ten-fold, with the highest growth rate from 2014 to 2018 (+ 8% annual change). Patches of lake wetlands were highly dynamic in space and time, partly reflecting highly variable annual rainfall patterns ranging from 501 mm in 1965 to 1374 mm in 2005 and monsoon-driven alterations in the hydrologic regime. While water bodies and flooded areas shrunk from 64 km2 in 1965 to 55 km2 in 2018, in 1965, the total rural wetland area with an SSI > 0.5 was twice as high as in 2018. The rural–urban land cover pattern within potential wetland areas changed drastically during this period. This is reflected, for example, by a four-fold increase in the wetland area with an SSI of 0.3, as compared to a decline by 43% in wetland area with an SSI of 0.8. While, in urban areas, wetlands were mostly lost to construction, in areas with a rural character, open water bodies were mainly transformed into green space. The detected changes in urban wetlands were likely accompanied by ecological regime changes, triggering deteriorations in ecosystem services (ESS) which merit further research.

Constructing Mediterranean wetland open water dynamics using a new 18-year MODIS-derived surface water fraction dataset

2020 ◽  
Author(s):  
Linlin Li ◽  
Anton Vrieling ◽  
Andrew Skidmore ◽  
Tiejun Wang
Keyword(s):  
Time Series ◽  
Surface Water ◽  
Temporal Dynamics ◽  
Open Water ◽  
Water Area ◽  
Water Bodies ◽  
Water Dynamics ◽  
Water Fraction ◽  
Wide Range

<p>Wetlands are among the most biodiverse ecosystems in the world, due largely to their dynamic hydrology. Frequent observations by satellite sensors such as the Moderate Resolution Imaging Spectrometer (MODIS) allow for monitoring the seasonal, inter-annual and long-term dynamics of surface water extent. However, existing MODIS-based studies have only demonstrated this for large water bodies despite the ecological importance of smaller-sized wetland systems. In this paper, we constructed the temporal dynamics of surface water extent for 340 individual water bodies in the Mediterranean region between 2000 and 2017, using a previously developed 8-day 500 m MODIS surface water fraction (SWF) dataset. These water bodies has a wide range of size, specifically 0.01 km<sup>2</sup> and larger. We then compared the water extent time series derived from MODIS SWF with those derived from a Landsat-based dataset. Results showed that MODIS- and Landsat-derived water extent time series showed a high correlation (r = 0.81) for more dynamic water bodies. Our MODIS SWF dataset can also effectively monitor the variability of very small water bodies (<1 km<sup>2</sup>) when comparing with Landsat data as long as the temporal variability in their surface water area was high. We conclude that MODIS SWF is a useful product to help understand hydrological dynamics for both small and larger-sized water bodies, and to monitor their seasonal, intermittent, inter-annual and long-term changes.</p>

Influence of Open Water Bodies on the Modeling of Summertime Convection over the Canadian Prairies

2017 ◽  
Vol 18 (6) ◽  
pp. 1583-1594
Author(s):  
Deepti Joshi ◽  
Marco Carrera ◽  
Stephane Bélair ◽  
Sylvie Leroyer
Keyword(s):  
Convective Available Potential Energy ◽  
Open Water ◽  
Water Bodies ◽  
Convective Precipitation ◽  
Precipitation Event ◽  
Canadian Prairies ◽  
Water Fraction ◽  
Weather Patterns ◽  
Global Environmental ◽  
Land Water

Abstract There are numerous water features on the Canadian landscapes that are not monitored. Specifically, there are water bodies over the prairies and Canadian shield regions of North America that are ephemeral in nature and could have a significant influence on convective storm generation and local weather patterns through turbulent exchanges of sensible and latent heat between the land and the atmosphere. In this study a series of numerical experiments is performed with Environment and Climate Change Canada’s Global Environmental Multiscale (GEM) model at 2.5-km grid spacing to examine the sensitivity of the atmospheric boundary layer and the resulting precipitation to the presence of open water bodies. Operationally, the land–water fraction in GEM is specified by means of static geophysical databases that do not change with time. Uncertainty is introduced in this study into this land–water fraction and the sensitivity of the resulting precipitation is quantified for a convective precipitation event occurring over the Canadian Prairies in the summer of 2014. The results indicate that with an increase in open water bodies, accumulated precipitation, peak precipitation amounts, and intensities decrease. Moreover, shifts are seen in times of peak for both precipitation amounts and intensities, in the order of increasing wetness. Additionally, with an increase in open water bodies, convective available potential energy decreases and convective inhibition increases, indicating suppression of forcing for convective precipitation.

scholarly journals Water Bodies Restoration: Examples of the Western Caucasus Basin District Small Rivers

2010 ◽  
Author(s):  
Keyword(s):  
Water Bodies ◽  
Monitoring Data ◽  
Small Rivers ◽  
Western Caucasus ◽  
Protective Measures ◽  
The Western Caucasus ◽  
The Republic

The paper has been prepared on the basis of the review of water bodies management and restoration methods used in Western Caucasus Basin District. According to the monitoring data, status of many water bodies is unsatisfactory due to their pollution and clogging. Clearing of small rivers in terms of silting and overgrowing in combination with other water/protective measures is the main kind of restoration activities. Restoration works at the Nazranka River in the Republic of Ingushetia and the Elistinka River in the Republic of Kalmikia are given as the relevant examples.

scholarly journals The landscaping of urban agglomeration park systems

Vestnik MGSU ◽  
2020 ◽  
pp. 294-306
Author(s):  
Aleksandra V. Ostyakova ◽  
Ekaterina V Pluisnina
Keyword(s):  
Water Body ◽  
Practical Importance ◽  
Pond Water ◽  
Water Bodies ◽  
Small Rivers ◽  
Urban Water ◽  
Normative Documents ◽  
Sources Of Pollution ◽  
City Water ◽  
Surrounding Areas

Introduction. Studying water body ecological problems and ensuring the necessary level of sanitary maintenance and landscaping of the reservoirs with the surrounding areas are relevant due to the inadequate environmental condition of a large number of urban water bodies and small rivers within settlements. Materials and methods. The review of the available normative documents and the carried-out actions on the improvement of city water objects is given. Based on the visual study of the state of the pond banks at the Karbyshev Park at the settlement of Nakhabino, Moscow region, water quality indicators, sources of pollution of the pond, the article concluded on the unsatisfactory ecological and aesthetic condition of this urban pond. The objective of this paper is to analyze the existing negative environmental factors affectig the water body and to propose an option of the site landscaping and further safe usage. Results. A description of the Karbyshev Park territory is given. Also, negative factors influencing the pollution of the pond banks, and the quality of pond water are specified. A proposal contains a list of necessary types of activities on cleaning and improving the pond bowl and surrounding territory under the condition of preservation of its ecosystem. As a result of the integrated assessment of the pond ecological state, a model of the urban water body was created, and a variant of its ecological reconstruction was proposed. Conclusions. The study is of practical importance for accounting and elimination of environmental problems of urban water bodies of the Central European Russia and proposals of measures for their improvement and reclamation.

scholarly journals Ist Wasserbau auch eine Frage der Ästhetik? | Is hydraulic engineering a question of aesthetics?

2008 ◽  
Vol 159 (7) ◽  
pp. 205-208
Author(s):  
Gianni Paravicini
Keyword(s):  
Open Water ◽  
Hydraulic Engineering ◽  
Water Bodies ◽  
Ecological Value ◽  
The Aesthetic ◽  
Bodies Of Water

There is much extended literature about classic technical hydraulic engineering and about the revitalization of bodies of water. This article deals with a third component, which has received little attention by the engineers. The author pleads for more aesthetic in hydraulic engineering, in particular in populated areas where many people use the open water bodies for recreation. It is shown that more aesthetic in hydrologic engineering often also leads to an increased ecological value. With hydraulic constructions in the canton of Lueerne, possible creative elements for the aesthetic and ecological revaluation of the course of creeks are discussed.

scholarly journals Discrete simulations of spatio-temporal dynamics of small water bodies under varied stream flow discharges

2005 ◽  
Vol 12 (1) ◽  
pp. 31-40 ◽  
Author(s):  
B. S. Daya Sagar
Keyword(s):  
Water Body ◽  
Stream Flow ◽  
Fractal Dimensions ◽  
Temporal Patterns ◽  
Temporal Organization ◽  
Water Bodies ◽  
Flow Discharge ◽  
Small Water ◽  
Spatio Temporal ◽  
Small Water Bodies

Abstract. Spatio-temporal patterns of small water bodies (SWBs) under the influence of temporally varied stream flow discharge are simulated in discrete space by employing geomorphologically realistic expansion and contraction transformations. Cascades of expansion-contraction are systematically performed by synchronizing them with stream flow discharge simulated via the logistic map. Templates with definite characteristic information are defined from stream flow discharge pattern as the basis to model the spatio-temporal organization of randomly situated surface water bodies of various sizes and shapes. These spatio-temporal patterns under varied parameters (λs) controlling stream flow discharge patterns are characterized by estimating their fractal dimensions. At various λs, nonlinear control parameters, we show the union of boundaries of water bodies that traverse the water body and non-water body spaces as geomorphic attractors. The computed fractal dimensions of these attractors are 1.58, 1.53, 1.78, 1.76, 1.84, and 1.90, respectively, at λs of 1, 2, 3, 3.46, 3.57, and 3.99. These values are in line with general visual observations.

A multi-temporal remote sensing approach for monitoring changes in spatial extent of freshwater lake of Deepor Beel Ramsar Site, a major wetland of Assam

2011 ◽  
Vol 5 ◽  
pp. 40-47 ◽  
Author(s):  
Jyotishman Deka ◽  
Om Prakash Tripathi ◽  
Mohammad Latif Khan
Keyword(s):  
Open Water ◽  
Management Plan ◽  
Rate Of Change ◽  
Freshwater Lake ◽  
Landsat Tm ◽  
Water Bodies ◽  
Food Storage ◽  
Data Mapping ◽  
Wetland Ecosystem ◽  
Rapid Urbanization

Sustainability of wetland ecosystem is necessary for various important functions such as food storage, water quality continuation and providing habitat for different species of flora and fauna. Hence, an inventory of wetlands of any region is a pre-requisite for their conservation and management. This study has been carried out to delineate the change in freshwater lake of ‘Deepor Beel’ wetland of Assam, India, using LANDSAT TM data. Field observation shows that the ecosystem is facing both natural as well as anthropogenic threats. Rapid urbanization, Illegal settlements, industries, invasive species (Eichhornia crassipes) are the major cause of this wetland decline. It has been found that massive decline occurred between the period 1991 to 2001 i.e., 1.891 sq.km which was at the rate of -0.171 per year where as the decline between the period 2001 to 2010 was found to be 1.013 sq. km which was at a rate of -0.101. The total area of open water bodies has decreased by 2.904 sq. km from 1991 to 2010 i.e. 59.19%. Thus the overall rate of change in the water bodies from 1991 to 2010 to other land use categories was found to be -0.145. Hence the study reveals the potentiality of Landsat TM data mapping the change in the wetland ecosystem. It is further hoped that the study will have high utility in preparing management plan for conservation of this ecosystem. Keywords: Wetland; Landsat TM; Thresholding; density sliceDOI: http://dx.doi.org/10.3126/jowe.v5i0.4696 J Wet Eco 2011 (5): 40-47

Assessing the Impacts of Temperature, Precipitation and Land Use Change on Open Water Bodies of Middle Ghaghara River Basin

2019 ◽  
pp. 185-202
Author(s):  
Rajesh Kumar ◽  
Prem Chandra Pandey ◽  
Pyarimohan Maharana ◽  
Hemant Gautam ◽  
Vijendra Kumar Pandey
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
River Basin ◽  
Open Water ◽  
Water Bodies
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