Contemporary Long-Term Trends in Water Discharge, Suspended Sediment Load, and Erosion Intensity in River Basins of the North Caucasus Region, SW Russia

Gusarov, Artyom V.; Sharifullin, A. G.; Komissarov, Mikhail

doi:10.3390/hydrology8010028

Cited by 13 publications

(19 citation statements)

References 57 publications

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“…To a significant extent, calculated SSL trends correspond to water discharge trends (Rets et al , 2020) and suspended sediment load changes (Gusarov et al , 2021) calculated previously for the Greater Caucasus (Table 6 ). Therefore, we performed a correlation analysis using a nonparametric Spearman correlation coefficient to compare our findings with previous studies.…”

Section: Trendsupporting

confidence: 67%

“…Therefore, we performed a correlation analysis using a nonparametric Spearman correlation coefficient to compare our findings with previous studies. As a result, we observed an insignificant negative correlation between the trendSSL values from our research and a change in suspended sediment load from Gusarov et al (2021) (Spearman r = -0.8, p = 0.1). Also, a significant negative correlation between change in mean July's water discharge and SSL trends was observed (Spearman r = -0.7, p = 0.06).…”

Section: Trendcontrasting

confidence: 55%

“…Even though we used data from 33 catchments (Fig. 1 ), which is significantly more than many other contemporary studies in that region (Gusarov et al , 2021), this number may still be too small to identify the impact of all relevant factors. However, especially considering more high-altitude gauging stations (higher than 1000 m) in the analyses could help since that altitude group is less populated with prolonged timeseries.…”

Section: Uncertaintiesmentioning

confidence: 99%

“…Trend comparison from various studies. Suspended sediment load ], this study), suspended sediment discharge fromGusarov et al (2021) (SSD [kg*s -1 ]), and water discharge characteristics [m 3 *s -1 ] fromRets et al (2020): change in mean monthly discharges in June, July, August (Q june , Q july , Q aug ), and change in annual peak discharge (Q max ).SourceThis study(Gusarov et al, 2021) (Rets et al, 2020) (Rets et al, 2020) (Rets et al, 2020) (Rets…”

mentioning

confidence: 99%

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How does the suspended sediment yield change in the North Caucasus during the Anthropocene?

Tsyplenkov

Golosov

Belyakova

2021

Preprint

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Quantifying and understanding catchment sediment yields is crucial both from a scientific and environmental management perspective. To deepen the understanding of land use impacts and climate change on sediment load, we explore mechanisms of the suspended sediment yield formation in the Northern Caucasus during the Anthropocene. We examine how sediment flux of various river basins with different land-use/landcover and glacier cover changes during the 1925-2018 period. Our analysis is based on observed mean annual suspended sediment discharges (SSD, kg·s−1) and annual fluxes (SSL, t·yr−1) from 33 Roshydromet gauging stations (Russia). SSL series have been analyzed to detect statistically significant changes during the 1925-2018 period. The occurrence of abrupt change points in SSD was investigated using cumulative sum (CUSUM) charts. We found that SSL has decreased by −1.81% per year on average at most gauges. However, the decline was not linear. Several transition years are expected in the region: increasing trends from the 1950s and decreasing trends from 1988-1994. Correlation analyses showed that variation in SSL trend values is mainly explained by gauging station altitude, differences in land use (i.e., the fraction of cropland), and catchment area. Nonetheless, more accurate quantifications of SSL trend values and more refined characterizations of the catchments regarding (historical) land use, soil types/lithology, weather conditions, and topography may reveal other tendencies.

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Section: Trendsupporting

confidence: 67%

Section: Trendcontrasting

confidence: 55%

Section: Uncertaintiesmentioning

confidence: 99%

mentioning

confidence: 99%

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How does the suspended sediment yield change in the North Caucasus during the Anthropocene?

Tsyplenkov

Golosov

Belyakova

2021

Preprint

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“…This decrease was most significant in the forest-steppe zone of the East European Plain [21], especially in the Middle Volga region [14] located south of the Vyatka River basin. However, in contrast to the Vyatka River basin, the decrease in erosion intensity and river SSL in the river basins of the more southern regions of European Russia occurred with considerable or predominant participation of climate [21,60].…”

Section: Comparison With Neighboring Regionsmentioning

confidence: 86%

Contemporary Trends in River Flow, Suspended Sediment Load, and Soil/Gully Erosion in the South of the Boreal Forest Zone of European Russia: The Vyatka River Basin

Gusarov

Sharifullin

Beylich³

2021

Water

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Recent decades in the north of the East European Plain have been characterized by significant changes in climate and land use/cover, especially after the collapse of the USSR in 1991. At the same time, the hydrological consequences of these changes, especially changes in erosion processes and river sediment load, have been studied insufficiently. This paper partially covers this existing knowledge gap using the example of the Vyatka River basin. Draining an area of 129,000 km2, the Vyatka River is among the largest rivers in the boreal forest zone of European Russia. Cultivated land occupies about one-fifth of the river basin area; about three-fourths is covered by taiga forest vegetation. The results of state long-term hydrometeorological monitoring and information on land use/cover made it possible to reveal contemporary (since the 1960s) hydrological and erosion-intensity trends and their drivers within the greater (96%) part of the river basin. There has been a statistically insignificant increase in water discharge in the Vyatka River basin during recent decades. This is due to a statistically insignificant increase (for the entire basin studied) in the spring snowmelt-induced floodwater flow and a statistically significant rise in the discharge in the year’s warm and cold seasons. The main reason for the detected trends is increased precipitation, including heavy rainfall during the warm season. In contrast to this, the total annual suspended sediment load of the river (especially that which was snowmelt-induced) and, consequently, soil/gully erosion intensity have experienced a significant decrease in recent decades (up to 58% between 1960–1980 and 2010–2018). Land-use/-cover changes (a reduction of cultivated land area and agricultural machinery, a decline of livestock in pastures) following the collapse of the Soviet Union are considered the main reasons for this decrease. The most noticeable changes in water discharge, suspended sediment load, and erosion intensity were observed in the most agriculturally developed southwest and south parts of the Vyatka River basin. All the above trends may be considered with a high probability to be representative for the south sector of the taiga zone of the East European Plain.

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How did the suspended sediment load change in the North Caucasus during the Anthropocene?

Tsyplenkov

Golosov

Belyakova

2021

Hydrological Processes

View full text Add to dashboard Cite

Quantifying and understanding catchment sediment fluxes is crucial both from a scientific and environmental management perspective. To deepen the understanding of landuse impacts and climate change on sediment load, we explore factors controlling the suspended sediment load formation in the Northern Caucasus during the Anthropocene. We examine how sediment flux of various river basins with different land-use/landcover and glacier cover changes during the 1925-2018 period. Our analysis is based on observed mean annual suspended sediment discharges (SSD, kg s À1 ) and annual fluxes (SSL, t year À1 ) from 33 gauging stations of The Federal Service for Hydrometeorology and Environmental Monitoring (Russia). SSL series have been analysed to detect statistically significant changes during the 1925-2018 period. The occurrence of abrupt change points in SSD was investigated using cumulative sum (CUSUM) charts. We found that SSL has decreased by À1.17% per year on average at most gauges. However, the decline was not linear. Several transition years are expected in the region increasing trends from the 1950s and decreasing trends from 1988 to 1994. Correlation analyses showed that variation in SSL trend values is mainly explained by gauging station altitude, differences in landuse (i.e. the fraction of cropland), and catchment area. Nonetheless, more accurate quantifications of SSL trend values and more refined characterizations of the catchments regarding (historical) landuse, soil types/lithology, weather conditions, and topography may reveal other tendencies.

show abstract

Contemporary Long-Term Trends in Water Discharge, Suspended Sediment Load, and Erosion Intensity in River Basins of the North Caucasus Region, SW Russia

Cited by 13 publications

References 57 publications

How does the suspended sediment yield change in the North Caucasus during the Anthropocene?

How does the suspended sediment yield change in the North Caucasus during the Anthropocene?

Contemporary Trends in River Flow, Suspended Sediment Load, and Soil/Gully Erosion in the South of the Boreal Forest Zone of European Russia: The Vyatka River Basin

How did the suspended sediment load change in the North Caucasus during the Anthropocene?

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