scholarly journals Nonlinear Model of River Runoff Fluctuations with Chaotic Regimes

2012 ◽  
pp. 4-20
Author(s):  
Keyword(s):  
Water Resources ◽  
Nonlinear Model ◽  
External Force ◽  
River Runoff ◽  
Loss Of Stability ◽  
Limiting Cycle ◽  
Diagnostic Characteristics

It is shown, that a loss of stability and a birth of a limiting cycle come into existence when only two variables (water resources, runoff) and the equations in the simplest form are exploited. Speed of evaporation is chosen as a managing parameter. Upon the influence of external force and the certain interval of values of the evaporation speed in the system chaotic regimes are established. The opportunity of occurrence of chaotic regimes in fluctuations of some concrete rivers is confirmed by values of the chaos diagnostic characteristics designed for them.

scholarly journals Statistical Assessment of the Runoff Variability of Small Rivers in the Middle Zeravshan Basin

2021 ◽  
Vol 36 (2) ◽  
pp. 252-256
Author(s):  
Khikmatov Fazliddin ◽  
Ganiev Shahob ◽  
Ziyaev Rahmat
Keyword(s):  
Water Resources ◽  
River Runoff ◽  
Coefficient Of Variation ◽  
Small Rivers ◽  
Statistical Assessment ◽  
Climatic Period ◽  
Coefficient Of Variability ◽  
Runoff Variability ◽  
Annual Water

The article deals with the issues of statistical assessment of the variability of the runoff of small rivers in the Middle Zeravshan basin. For this purpose, the average monthly and annual water discharges were used, taken into account at 11 hydrological stations located on small rivers and water resources in the Middle Zeravshan basin. Calculations to estimate the coefficient of variability of river runoff were carried out for two periods: the first calculation period includes the base climatic period (1961-1990), and the second calculation period includes 1991-2018. Based on the analysis of the results obtained, an increase in the value of the coefficient of variation (Cv) in the second calculation period relative to the first calculation period was revealed.

The «rainfall-runoff» system and its long-term fluctuations in the Siverskyi Donets River Basin (Ukraine)

2021 ◽  
Author(s):  
Hanna Bolbot ◽  
Vasyl Grebin
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
River Basin ◽  
Air Temperature ◽  
River Runoff ◽  
Annual Runoff ◽  
Annual Precipitation ◽  
Spring Flood ◽  
Current Period

<p>The current patterns estimation of the water regime under climate change is one of the most urgent tasks in Ukraine and the world. Such changes are determined by fluctuations in the main climatic characteristics - precipitation and air temperature, which are defined the value of evaporation. These parameters influence on the annual runoff distribution and long-term runoff fluctuations. In particular, the annual precipitation redistribution is reflected in the corresponding changes in the river runoff.<br>The assessment of the current state and nature of changes in precipitation and river runoff of the Siverskyi Donets River Basin was made by comparing the current period (1991-2018) with the period of the climatological normal (1961-1990).<br>In general, for this area, it was defined the close relationship between the amount of precipitation and the annual runoff. Against the background of insignificant (about 1%) increase of annual precipitation in recent decades, it was revealed their redistribution by seasons and separate months. There is a decrease in precipitation in the cold period (November-February). This causes (along with other factors) a decrease in the amount of snow and, accordingly, the spring flood runoff. There are frequent cases of unexpressed spring floods of the Siverskyi Donets River Basin. The runoff during March-April (the period of spring flood within the Ukrainian part of the basin) decreased by almost a third.<br>The increase of precipitation during May-June causes a corresponding (insignificant) increase in runoff in these months. The shift of the maximum monthly amount of precipitation from May (for the period 1961-1990) to June (in the current period) is observed.<br>There is a certain threat to water supply in the region due to the shift in the minimum monthly amount of precipitation in the warm period from October to August. Compared with October, there is a higher air temperature and, accordingly, higher evaporation in August, which reduces the runoff. Such a situation is solved by rational water resources management of the basin. The possibility of replenishing water resources in the basin through the transfer runoff from the Dnieper (Dnieper-Siverskyi Donets channel) and the annual runoff redistribution in the reservoir system causes some increase in the river runoff of summer months in recent decades. This is also contributed by the activities of the river basin management structures, which control the maintenance water users' of minimum ecological flow downstream the water intakes and hydraulic structures in the rivers of the basin.<br>Therefore, in the period of current climate change, the annual runoff distribution of the Siverskyi Donets River Basin has undergone significant changes, which is related to the annual precipitation redistribution and anthropogenic load on the basin.</p>

scholarly journals Resources of River Runoff of Kazakhstan

2019 ◽  
Vol 8 (6) ◽  
pp. 2242-2250
Keyword(s):  
Water Resources ◽  
River Runoff ◽  
Regional Climate ◽  
Geographical Location ◽  
Hydrological Regime ◽  
Water Shortage ◽  
Point Of View ◽  
Spatiotemporal Variability ◽  
Anthropogenic Factors

The role of river runoff resources is very important for Kazakhstan – the country located deep within the continent, with an arid climate, and experiencing water shortage. With such a geographical location, the hydrological regime of rivers is characterized by the considerable spatiotemporal variability, thereby complicating the water resousrces management. The issue of evaluating water resources is particularly relevant not only from a scientific point of view. In recent years, it has gained socio-economic and political nature due to the increasing role of anthropogenic factors (including geopolitical ones), as well as increasingly more noticeable changes in the global and regional climate. Based on hydrometric information using modern methodology, the water resources of eight water-resources basins (WRBs) on the territory of Kazakhstan have been estimated in the context of water-resources regions.

scholarly journals RETROSPECTIVE ANALYSIS OF WATERNESS CHANGE IN THE DON RIVER

2021 ◽  
Vol 1 (6) ◽  
pp. 84-87
Author(s):  
G.Kh. Ismaiylov ◽  
◽  
N.V. Muraschenkova ◽  
I.G. Ismaiylova
Keyword(s):  
Water Resources ◽  
Water Content ◽  
Retrospective Analysis ◽  
River Runoff ◽  
Water Medium ◽  
Spring Flood ◽  
Integral Curves ◽  
Don River ◽  
Seasonal Runoff

Water resources are one of the most important problems of our time. Population growth, industrial and agricultural development all over the world entail an ever-increasing demand for clean fresh water. These circumstances induce hydrologists to actively and thoroughly study the problem of studying water resources, changing their quantitative and qualitative characteristics in time and space, and the peculiarities of changes in the water regime of river runoff under conditions of climatic changes. In this work, we performed a retrospective analysis and assessment of changes in the water content of the Upper Don basin over a long 126-year period of hydrometric observational data (1881/1882–2006/2007). To study the change in the water content of the Upper Don River, we used the difference integral curves of the annual and seasonal (spring flood, summerautumn and winter low-water periods) runoff. Regularities of long-term cyclical fluctuations in the water content of the annual and seasonal runoff of the Upper Don are obtained. A retrospective analysis of long-term data of hydrometric observations made it possible to distinguish long phases of high-water, medium-water-content and low-water years on the differential integral curves of river runoff. Each phase, which is long in terms of water content, contains groups of years of shorter duration, for example, 2–3-year and 4–5-year phases of increased and decreased water content in a river. The analysis of the differential integral curves of the annual and seasonal runoff made it possible to establish that the long-term fluctuations in the annual runoff of the Upper Don are rhythmic, in contrast to the runoff of the spring flood, summer-autumn and winter low-water periods, which are characterized by a monotonic regime.

scholarly journals DETERMINATION OF FACTORS OF FORMATION OF QUALITATIVE COMPOSITION OF SURFACE WATER OBJECTS BY THE METHOD OF MAIN COMPONENTS (ON THE EXAMPLE OF RIVERS OF THE DNIEPER BASIN)

2021 ◽  
pp. 31-35
Author(s):  
Roman Ponomarenko ◽  
Leonid Plyatsuk ◽  
Josef Zat’ko
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Water Resources ◽  
River Runoff ◽  
Water Bodies ◽  
State Agency ◽  
Local Conditions ◽  
Surface Water Bodies ◽  
Main Components

The article analyzes the water quality of surface water bodies (on the example of rivers of the Dnieper basin) by the method of main components, identifies and interprets the main factors that form long-term variability of water quality of surface water bodies and make different contributions to the total variance. The research was carried out according to the samples of control water intake of the Dnieper River within the Basin Water Resources Management at 12 posts, for the period from 2011 to 2020. The leading factors were identified: plant and animal organisms (12…39 %), leaching of Fe- and Cu-containing minerals (10…29 %). The article shows that in the formation of the chemical composition of the water of the rivers of the studied region is determined by the factor of ion from the rocks on which the formation of the catchment. A factor characterizing the local conditions of river runoff formation has been identified - the process of groundwater discharge, which is manifested in changes in the concentrations of silicon and nitrates. In addition, a negative dependence of changes in the content of silicon ions and nitrates on temperature. The originality of the study is based on an integrated approach, which includes research based on available data in the State Agency of Water Resources of Ukraine, which takes into account the principles of biodiversity conservation, sustainable use of water resources, river management and basins, monitoring and evaluation of their status. In the future, the proposed approach may be the subject of research in the direction of establishing factors that characterize the local conditions of formation of river runoff, including taking into account the man-made load on it.

scholarly journals Analysis on the influence of runoff trend in the Liusha River Basin of Xishuangbanna

2021 ◽  
Vol 228 ◽  
pp. 02010
Author(s):  
Zhen Ling ◽  
Shan Xu ◽  
Minghua Dong ◽  
Guojian Feng ◽  
Hong Huo ◽  
...  
Keyword(s):  
Water Resources ◽  
River Basin ◽  
River Runoff ◽  
Large Scale ◽  
Water Security ◽  
Comparison Method ◽  
Ecological Environment ◽  
Rubber Plantation ◽  
Natural Forests ◽  
Runoff Change

In recent decades, there are lots of the changes of land use in the Liusha River basin in Xishuangbanna, Yunnan Province. The large-scale replacement of natural forests by rubber plantation have had a certain impact on the ecological environment and water resources in the Liusha River basin. Based on the data of runoff, rainfall and evaporation from 1963 to 2015 measured by Menghai Hydrological Station of Liusha River, the effects of climate change and human activities on the ecological environment of Liusha River runoff and the degree of change were analyzed by using the comparison method of slope change rate of runoff accumulation. The research results show that the cumulative amount of runoff flow after mutation presents significant decrease trend from 1963 to 2015. Because of the Liusha river runoff change decision which residents downstream watershed water security, the runoff of the ecological environment situation and analysis, the protection of natural resources such as forests and the effective protection of regional water resources sustainable development has important guiding significance.

scholarly journals GIS-based Assessment of the Assimilative Capacity of Rivers in Dnipropetrovsk Region

2018 ◽  
Vol 27 (2) ◽  
pp. 274-285
Author(s):  
D. Kulikova ◽  
O. Kovrov ◽  
Yu. Buchavy ◽  
V. Fedotov
Keyword(s):  
Water Resources ◽  
River Runoff ◽  
Aquatic Ecosystems ◽  
Ecological Status ◽  
Capacity Utilization ◽  
Water Bodies ◽  
State Agency ◽  
Anthropogenic Factors ◽  
Assimilative Capacity ◽  
The Impact

The objective of this paper is to identify the level of changes in the ecological status of surface reservoirs of Dnipropetrovsk region under the impact of anthropogenic factors and to find a rationale for the limit loads on aquatic ecosystems, based on a quantitative assessment of their assimilative capacity values using GIS-technologies.To characterize and evaluate economic activity in the river basins of Dnipropetrovsk re- gion, the data of state statistical reporting by the form of 2-TP "Water resources management" of the State Agency for Water Re- sources of Ukraine were used. Parameters characterizing the assimilative capacity of water bodies were determined by taking into consideration the perennial average values of river runoff resources of the priority watercourses of Dnipropetrovsk region in the years with varying degrees of supply: with an average (50%), a low (75%) and a very low (95%) river water content. The main indicators characterizing the assimilative capacity of the water bodies of Dnipropetrovsk region are actual and necessary multiplicity of waste- water dilution, the limit to assimilative capacity of surface reservoirs, index of assimilative capacity utilization of river runoff re- sources of varying degrees of supply. A classification that characterizes the level of assimilative capacity utilization for water bodies is proposed. The level of assimilative capacity utilization of the Dnipro River in the reservoir areas, regardless of the degree of river runoff supply, is estimated as “allowable” . At 95% degree of river runoff supply, the level of assimilative capacity utilization of the Oril and Vovcha Rivers is characterized as “moderate”, the Samara River (after the confluence with the Vovcha River) as “high” and the Ingulets River with tributary the Saksagan River, and the Samara River (before confluence with the Vovcha River) as “veryhigh”. It should be noted that irrespective of the level of river runoff supply, the index of assimilative capacity utilization of the Samara River (before its confluence with the Vovcha River) exceeds the limit value by 19-115 times. For the spatial analysis of hydrological parameters and visualizion of the data in the form of thematic maps, the geoinformation system “Rivers of Dnipropetrovsk region” was developed on the basis of the ESRI ArcGIS Desktop10 software package. Using the geoprocessing tools, on the basis of hydrological indices of 7 priority watercourses for each of the 22 administrative-territorial districts of Dnipropetrovsk region, the main indicators characterizing the assimilative capacity of water resources were calculated and ranked. The use of indicatorscharacterizing the assimilative capacity of river runoff resources allows us to identify the threshold levels of anthropogenic transfor- mation of aquatic ecosystems, develop and implement environmental measures to improve the ecological status and ensure environ- mental safety of surface reservoirs.

scholarly journals Assessment of Renewable Water Resources of the European Part of Russia and Spatial/temporal Analysis of their Distribution

2016 ◽  
pp. 18
Author(s):  
Keyword(s):  
Water Resources ◽  
Ground Water ◽  
River Runoff ◽  
Temporal Dynamics ◽  
Atmospheric Precipitation ◽  
Temporal Analysis ◽  
European Part ◽  
Geological Processes ◽  
European Part Of Russia ◽  
Resources Distribution

Assessment and analysis of the annual, low-water and minimal monthly runoff of the European part of Russia over the past 35 years (till 2011) in comparison with the earlier periods of observation (1945–1977) have been performed. The runoff genesis for different river basins has been studied and the main causes of the current changes of the runoff characteristics have been found. Regional regularities of hydrological/hydro/geological processes have been stated zoning of the territories with emphasis on the river runoff formation features has been carried out. Re-estimation of the renewable (natural) surface and ground water resources over 1970–2010 has been done. Regional estimation and analysis of water resources distribution in the European part of Russia enable to make conclusions on the surface and ground water components of river runoff spatial/temporal dynamics taking into consideration contemporary features of their formation under the non-stationary climate influence. Positive changes of the annual average and especially winter air temperatures in combination with atmospheric precipitation greatly affected the rivers water content and their runoff regime. Climate changes have already caused considerable alterations of the water regime and the water resources formation conditions in a number of major regions.

scholarly journals GLOBAL WATER RESOURCES: CHALLENGES OF THE 21st CENTURY

2020 ◽  
pp. 6-16
Author(s):  
V. Khilchevskyi
Keyword(s):  
Water Resources ◽  
Fresh Water ◽  
River Runoff ◽  
Water Scarcity ◽  
River Flow ◽  
Water Footprint ◽  
Virtual Water ◽  
Human Society ◽  
The World ◽  
Global Water

The article provides an analytical overview of the state of global water resources and their use in the world. The focus is on the most important component of water resources – freshwater, which on the planet is only 2.5 % of the total. The most accessible renewable water resources are river runoff, which is distributed unevenly on the surface of the planet: Asia (32 %), South America (28 %), North America (18 %), Africa (9 %), Europe (7%), Australia and Oceania (6 %). Along with the characteristics of the known components of freshwater resources (river runoff, groundwater, glaciers), attention is also focused on trends in attracting unconventional sources (recovered wastewater or gray water, desalinated, specially collected rainwater). The total use of fresh water in the world is only 9 % of the total river flow of the planet. At the same time, the problem of water scarcity was included in the list of the World Economic Forum 2015, as one of the global risks in terms of the potential impact on human society in the next decade. Among the causes of global water, scarcity are geographical and socio-economic. Geographical reasons are the spatial and temporal (seasonal) mismatch of the demand for fresh water and its availability. Socio-economic reasons are the growth of the world’s population, urbanization, improving living standards, changes in consumption patterns, and an increase in irrigated land. The latter has become key to the growth of global water demand. Experts forecast that the limited access to fresh water in 2050 can be felt by 3.3 billion more people than in 2000. The article gives examples of a methodology for the hydrological assessment of water scarcity (calculation of the ratio of the volume of annual renewable water resources to the population) and the methodology of economic and geographical assessment. Other approaches to assessing water resources by creating new paradigms (water – blue, green, virtual, water footprint) have been characterized. Throughout the history of mankind, there have been many conflicts related to water. Active water cooperation between countries today reduces the risk of military conflicts. This conclusion was made after studying transboundary water relations in more than 200joint river basins, covering 148 countries. The right to safe water and sanitation is a fundamental right of everyone (UN, 2010). Therefore, among the 17 sustainable development goals adopted by the UN for implementation for the period 2015-2030, Global Goal 6 “Clean Water and Good Sanitary Conditions” is aimed at ensuring sustainable management of water resources and sanitation for all. This will save people from diseases, and society will be given the opportunity to be more productive in economic terms.

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