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.

scholarly journals Coral Luminescence Identifies the Pacific Decadal Oscillation as a Primary Driver of River Runoff Variability Impacting the Southern Great Barrier Reef

PLoS ONE ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. e84305 ◽  
Author(s):  
Alberto Rodriguez-Ramirez ◽  
Craig A. Grove ◽  
Jens Zinke ◽  
John M. Pandolfi ◽  
Jian-xin Zhao
Keyword(s):  
Great Barrier Reef ◽  
Pacific Decadal Oscillation ◽  
River Runoff ◽  
Barrier Reef ◽  
The Pacific ◽  
Primary Driver ◽  
Runoff Variability

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>

COMPARATIVE ASSESSMENT OF THE INTRA-ANNUAL WATER RUNOFF DISTRIBUTION OF THE RIVERS THE ROS AND UBORT

2020 ◽  
pp. 72-80
Author(s):  
O. A. Chunarov
Keyword(s):  
Initial Data ◽  
Water Content ◽  
River Water ◽  
Water Consumption ◽  
River Runoff ◽  
River Basins ◽  
Comparative Assessment ◽  
Water Runoff ◽  
Annual Water ◽  
Annual Distribution

The article examines the intra-annual distribution of water runoff of the Ros and Ubort rivers, as well as its comparative assessment. The rivers Ros and Ubort were chosen for further research, because according to geographical conditions, river basins belong to natural and regulated water bodies. The rivers Ros and Ubort are characterized by summer-autumn and winter lows, which are disturbed by separate rises in water levels during rains or melting snow. The formation of the main part of river runoff is due to spring flooding. The initial data for studying the intra-annual distribution of runoff were the data of average annual water flow in the confluence of the rivers Ros and Ubort, namely: the river Ros – Korsun-Shevchenkivsky and the river Ubort – Perga for the entire period of hydrological observations. The initial data are the average annual water consumption of the closing sections of the Ros and Ubort rivers for the entire observation period. To confirm (or refute) the changes in the water content of the studied rivers, the homogeneity of some of their runoff characteristics was analyzed by different methods. Statistical methods for estimating the homogeneity of hydrological series are used for quantities that are random and internally independent. The homogeneity of the series of average annual water consumption over a multi-year period is estimated according to the current hydrological posts of the basins of the rivers Ros and Ubort. The analysis of previous publications on the intra-annual distribution of river water runoff for the territory of the studied river basins, the influence of climatic factors on the change of river runoff, as well as summarizes the results of these studies. The intra-annual distribution of river water runoff for years of different water content and separate phases for the basins of both studied rivers is calculated by the season composition method. The comparative characteristics of the obtained results are carried out and the common hydrological characteristics and significant differences in the studied river basins are revealed.

scholarly journals Food Security in the United Arab Emirates (UAE): The Great Competition between the Agricultural and Forestry Sector on Irrigation Resources

2015 ◽  
Vol 1 (1) ◽  
pp. 19 ◽  
Author(s):  
Suzan Marwan Shahin ◽  
Mohammed Abdul Muhsen Salem
Keyword(s):  
Food Security ◽  
Water Resources ◽  
United Arab Emirates ◽  
Crop Production ◽  
Saline Water ◽  
Life Time ◽  
Water Withdrawal ◽  
Forestry Sector ◽  
Groundwater Supply ◽  
Annual Water

The United Arab Emirates (UAE) is a country that has scarcity in fresh water resources. Groundwater, which contributes to 70% of the total water resources in the country, is a non-renewable water resource. This resource plays significant role in converting the desert to a green paradise. It covers around 95% and 82% of the watering requirements of the agricultural and forestry sector, respectively. Besides the critical problems that this resource suffers from; including depletion, saline water intrusion and contamination. It has also a limited life time expectancy, estimated to be between 16 to 36 years. The total annual water withdrawal by the green sector in the country is estimated to be above 2198 million m3, from which above 32% is used to cover the irrigation requirements for the forestry sector and landscaping, while the rest amount is used for crop production purposes. The great competition between the two sectors, lead to make the sustainability approach in maintaining both sectors extremely difficult, especially with the absence of groundwater supply and the sharp population growth. Therefore, serious and quick actions have to take place; in order to save the future of food security in the UAE.

scholarly journals Runoff Variability in the Scott River (SW Spitsbergen) in Summer Seasons 2012–2013 in Comparison with the Period 1986–2009

2016 ◽  
Vol 35 (3) ◽  
pp. 39-50 ◽  
Author(s):  
Łukasz Franczak ◽  
Waldemar Kociuba ◽  
Grzegorz Gajek
Keyword(s):  
River Runoff ◽  
Discharge Rate ◽  
High Variability ◽  
Flow Rates ◽  
Ice Melt ◽  
Glacier Ice ◽  
Runoff Variability ◽  
Daily Discharge ◽  
The Mean

Abstract River runoff variability in the Scott River catchment in the summer seasons 2012 and 2013 has been presented in comparison to the multiannual river runoff in 1986–2009. Both in particular seasons and in the analysed multiannual, high variability of discharge rate was recorded. In the research periods 2012–2013, a total of 11 952 water stages and 20 flow rates were measured in the analysed cross-section for the determination of 83 daylong discharges. The mean multiannual discharge of the Scott River amounted to 0.96 m3·s−1. The value corresponds to a specific runoff of 94.6 dm3·s−1·km2, and the runoff layer 937 mm. The maximum values of daily discharge amounted to 5.07 m3·s−1, and the minimum values to 0.002 m3·s−1. The highest runoff occurs in the second and third decade of July, and in the first and second decade of August. The regime of the river is determined by a group of factors, and particularly meteorological conditions affecting the intensity of ablation, and consequently river runoff volume. We found a significant correlation (0.60 in 2012 and 0.67 in 2013) between the air temperature and the Scott River discharge related to the Scott Glacier ice melt.

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 Assessment of water quality in the downstream of the Amu Darya basin

2021 ◽  
Vol 264 ◽  
pp. 03049
Author(s):  
Feruzbek Karimboev ◽  
Daulet Gulomov ◽  
Zarina Tillayeva
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Socioeconomic Development ◽  
Water Shortage ◽  
Anthropogenic Factors ◽  
Amu Darya ◽  
Quality Of Water ◽  
Current Water ◽  
Annual Water ◽  
Projected Changes

Ecosystem vulnerability increases significantly when anthropogenic factors overlap with the effects of adverse climate change, which together negatively affect biodiversity and ecosystem functioning. According to ADB forecasts, the inflow to the lower reaches of the Amu Darya will decrease by 26-35% by 2050. The combined effect of higher water demand and lower inflow will increase the current water shortage - the annual water shortage will increase to 50% of the total demand. In connection with the projected changes, the current state of water resources of the Amu Darya river, as well as the need for the socioeconomic development of the region, the task of assessing the projected impact of climate change on the availability and quality of water resources becomes urgent.

Sign in / Sign up

Export Citation Format

Share Document