scholarly journals PATH MODELLING ANALYSIS OF POLLUTION SOURCES AND ENVIRONMENTAL CONSEQUENCES IN RIVER BASINS

2018 ◽  
Author(s):  
ANTÓNIO FERNANDES ◽  
ANA FERREIRA ◽  
LUÍS SANCHES FERNANDES ◽  
RUI CORTES ◽  
FERNANDO PACHECO
Keyword(s):  
River Basins ◽  
Pollution Sources ◽  
Environmental Consequences ◽  
Modelling Analysis ◽  
Path Modelling

Experienced international business traveller’s behaviour in Iran: A partial least squares path modelling analysis

2016 ◽  
Vol 18 (2) ◽  
pp. 163-190 ◽  
Author(s):  
Sajad Rezaei ◽  
Milad Kalantari Shahijan ◽  
Naser Valaei ◽  
Roya Rahimi ◽  
Wan Khairuzzaman Wan Ismail
Keyword(s):  
Risk Perception ◽  
Least Squares ◽  
Partial Least Squares ◽  
International Business ◽  
Risk Perceptions ◽  
Information Sources ◽  
Destination Image ◽  
Travel Experience ◽  
Modelling Analysis ◽  
Path Modelling

Few researchers have examined travellers’ experience with destinations despite the importance of their attitudes, behaviour and perception in selecting destinations. Current study aims to examine the relationship between risk perceptions, motivation, information source, travel experience and destination image among experienced international business travellers in Iran. The total number of 234 valid questionnaires was collected from international business travellers and structural equation modelling was employed using partial least squares path-modelling analysis to assess measurement and structural model for reflective constructs. Our empirical results support the negative relationship between destination image and risk perception, travel experience and risk perception while information sources were found to be unrelated to travellers risk perceptions. The results further shown that information sources and destination image, information sources and motivation, motivation and travel experience and destination image are related. However, the partial least squares-multigroup analysis results reveal that the significance of path coefficients differs across various demographic subgroups. Moreover, our results support experience and risk perception as a second-order reflective construct. Practical and theoretical implications are discussed along with a discussion on research limitations.

scholarly journals PATH MODELLING ANALYSIS OF NATURAL RADIOACTIVITY IN DRINKING WATER AND PUBLIC HEALTH IMPACTS

2019 ◽  
Author(s):  
LISA MARTINS ◽  
ALCIDES PEREIRA ◽  
ALCINO OLIVEIRA ◽  
LUÍS SANCHES FERNANDES ◽  
FERNANDO PACHECO
Keyword(s):  
Public Health ◽  
Drinking Water ◽  
Natural Radioactivity ◽  
Health Impacts ◽  
Modelling Analysis ◽  
Path Modelling

scholarly journals The Impact of Upstream Sub-basins’ Water Use on Middle Stream and Downstream Sub-basins’ Water Security at Country-Basin Unit Spatial Scale and Monthly Temporal Resolution

2019 ◽  
Vol 16 (3) ◽  
pp. 450 ◽  
Author(s):  
Dagmawi Mulugeta Degefu ◽  
Zaiyi Liao ◽  
Weijun He ◽  
Liang Yuan ◽  
Min An ◽  
...  
Keyword(s):  
Water Stress ◽  
Water Security ◽  
River Basins ◽  
Water Withdrawal ◽  
Transboundary River ◽  
Environmental Consequences ◽  
Transboundary River Basins ◽  
Inflection Points ◽  
Middle Stream ◽  
The Impact

Water, in most of the transboundary river basins, is a bone of contention among their riparian states. Taking this into account, this article assessed the monthly impact of upstream water withdrawal on the water security of middle stream and downstream sub-basins at a country-basin mesh spatial resolution. Roughly 2.18 billion people in 442 sub-basin areas experience water stress intensification by less than 1% throughout the year. In addition, 2.12 billion people in 336 sub-basin areas experience water stress level change, from no water stress to one of the water stress categories, for at least one month as the result of upstream withdrawal. Even though there is a clear upstream impact in many of the basins, water disputes with severe social, economic, political, and environmental consequences are nonexistent. This might be an indication that grave water disputes are the result of complex socio-economic and political interactions, not merely because of water deficits due to upstream water withdrawal. Therefore, understanding this relationship is crucial in identifying inflection points for water conflicts within transboundary river basins.

Cogeneration and District Energy Systems: Modelling, Analysis and Optimization

2016 ◽  
Author(s):  
Marc A. Rosen Rosen ◽  
Seama Koohi-Fayegh Koohi-Fayegh
Keyword(s):  
Energy Systems ◽  
District Energy ◽  
Modelling Analysis ◽  
Systems Modelling

MODERN HYDROGRAPHIC AND WATER MANAGEMENT ZONING OF UKRAINE’S TERRITORY – IMPLEMENTATION OF THE WFD-2000/60/EC

2020 ◽  
Author(s):  
V.K. Khilchevskyi ◽  
Keyword(s):  
Water Management ◽  
Water Resources ◽  
River Basins ◽  
River Basin Management ◽  
The Black Sea ◽  
Main Function ◽  
River Basin Management Plans ◽  
Management Plans ◽  
The Crimea ◽  
Sea Coast

In contrast to the hydrological and hydrochemical zoning, hydrographic and water management zoning of Ukraine (2016) was created on a basin basis, taking into account the boundaries of river basins, and not physiographic zoning. The main function of hydrographic and water management zoning is water management. Primary is hydrographic zoning, and water management - based on it. The description of modern hydrographic zoning of the territory of Ukraine, approved in 2016 by the Verkhovna Rada of Ukraine and included in the Water Code of Ukraine is given. Hydrographic zoning is carried out for the development and implementation of river basin management plans. On the territory of Ukraine nine areas of river basins are allocated: Dnipro; Dnister; Danube; Southern Bug; Don; Vistula; rivers of the Crimea; rivers of the Black Sea coast; rivers of the Azov Sea coast 13 sub-basins are allocated in four river basins district. The water management zoning is described - the division of hydrographic units into water management areas, which is carried out for the development of water management balances. In the regions of the river basins in the territory of Ukraine allocated 132 water management areas, 59 of which are located in the Dnipro basin. About 9,000 bodies of surface water allocated for monitoring in Ukraine. Approved zoning is the implementation of the provisions of the EU Water Framework Directive 2000/60 / EC in the management of water resources in Ukraine. Modern hydrographic and water management zoning of the territory of Ukraine approximates the management of water resources of the state to European requirements.

The concept of local explosion in freshwater ecosystems

2013 ◽  
Vol 25 (1-2) ◽  
pp. 136-148
Author(s):  
I. V. Gryb
Keyword(s):  
Species Composition ◽  
Aquatic Environment ◽  
Arid Zone ◽  
Fish Fauna ◽  
River Basins ◽  
Freshwater Ecosystems ◽  
Human Society ◽  
Living Matter ◽  
Ecosystem Recovery ◽  
Average Temperature

The concept of an explosion in freshwater ecosystems as a result of the release of accumulated energy, accompanied by the destruction of the steady climax successions of hydrocenoses is presented. The typification of local explosions as well as methods for assessing their risk during the development of river basins are shown. The change in atmospheric circulation, impaired phases of the hydrological regime of rivers, increasing the average temperature of the planet, including in Polesie to 0,6 ºC, deforestation leads to concentration and release of huge amounts of unmanaged terrestrial energy, which manifests itself in the form of disasters and emergencies. Hydroecological explosion is formed as a result of multifactorial external influence (natural and anthropogenic) on the water body in a certain period of time. Moreover, its level at wastewater discharge depends on the mass of recycled impurities and behaved processing capacity of the reservoir, and the mass of dumped on biocides and the possibility of the water flow to their dilution and to the utilization of non-toxic concentrations. In all these cases the preservation of "centers of life" in the tributaries of the first order – local fish reproduction areas contributed to ecosystem recovery, and the entire ecosystem has evolved from equilibrium to non-equilibrium with further restructuring after the explosion and environmental transition to a new trophic level. It means that hydroecological explosion can be researched as the logical course of development of living matter in abiotic environmental conditions, ending abruptly with the formation of new species composition cenoses and new bio-productivity. The buffer capacity of the water environment is reduced due to re-development and anthropic transformation of geobiocenoses of river basins, which leads to a weakening of life resistance. This applies particularly to the southern industrial regions of Ukraine, located in the arid zone that is even more relevant in the context of increased average temperature due to the greenhouse effect, as well as to Polesie (Western, Central and Chernihiv), had been exposed to large-scale drainage of 60-80th years, which contributed to the degradation of peatlands and fitostroma. Imposing the western trace of emissions from the Chernobyl accident to these areas had created the conditions of prolonged hydroecological explosion in an intense process of aging water bodies, especially lakes, change in species composition of fish fauna and the occurrence of neoplasms at the organismal level. Under these conditions, for the existence of man and the environment the vitaukta should be strengthened, i.e. buffer resistance and capacitance the aquatic environment, bioefficiency on the one hand and balanced using the energy deposited - on the other. This will restore the functioning of ecosystems "channel-floodplain", "riverbed-lake", reducing the energy load on the aquatic environment. Hydroecological explosions of natural origin can not be considered a pathology – it is a jump process of natural selection of species of biota. Another thing, if they are of anthropogenic origin and if the magnitude of such an impact is on the power of geological factors. Hydroecological explosions can be regarded as a manifestation of environmental wars that consciously or unconsciously, human society is waging against themselves and their kind in the river basins, so prevention of entropy increase in the aquatic environment and the prevention of hydroecological explosions is a matter of human survival. While the man - is not the final link in the development of living matter, it can develop without him, as matter is eternal, and the forms of its existence are different.

Identification of sibling species in the genus Eucyclops from water-bodies of Ukraine and Russia using crossbreeding studies

2014 ◽  
Vol 25 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
V. I. Monchenko ◽  
L. P. Gaponova ◽  
V. R. Alekseev
Keyword(s):  
Cryptic Species ◽  
River Basin ◽  
Black Sea ◽  
Species Complex ◽  
River Basins ◽  
Water Bodies ◽  
Similar Species ◽  
Basin Water ◽  
Different Populations ◽  
Baltic Sea Basin

Crossbreeding experiments were used to estimate cryptic species in water bodies of Ukraine and Russia because the most useful criterion in species independence is reproductive isolation. The problem of cryptic species in the genus Eucyclops was examined using interpopulation crosses of populations collected from Baltic Sea basin (pond of Strelka river basin) and Black Sea basin (water-reservoires of Dnieper, Dniester and Danube rivers basins). The results of reciprocal crosses in Eucyclops serrulatus-group are shown that E. serrulatus from different populations but from water bodies belonging to the same river basin crossed each others successfully. The interpopulation crosses of E. serrulatus populations collected from different river basins (Dnipro, Danube and Dniester river basins) were sterile. In this group of experiments we assigned evidence of sterility to four categories: 1) incomplete copulation or absence of copulation; 2) nonviable eggs; 3) absence of egg membranes or egg sacs 4) empty egg membranes. These crossbreeding studies suggest the presence of cryptic species in the E. serrulatus inhabiting ecologically different populations in many parts of its range. The same crossbreeding experiments were carries out between Eucyclops serrulatus and morphological similar species – Eucyclops macruroides from Baltic and Black Sea basins. The reciprocal crossings between these two species were sterile. Thus taxonomic heterogeneity among species of genus Eucyclops lower in E. macruroides than in E. serrulatus. The interpopulation crosses of E. macruroides populations collected from distant part of range were fertile. These crossbreeding studies suggest that E. macruroides species complex was evaluated as more stable than E. serrulatus species complex.

Evaluation of pacific salmon Oncorhynchus spawning escapement landmarks for the river basins of West Kamchatka

2019 ◽  
pp. 50-78
Author(s):  
Mark G. Feldman ◽  
◽  
Evgeny A. Shevlyakov ◽  
Nina B. Artukhina ◽  
◽  
...  
Keyword(s):  
Pacific Salmon ◽  
River Basins
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