Suspended sediment balance in Selenga delta at the late XX–early XXI century: Simulation by LANDSAT satellite images

Chalov, Sergey; Bazilova, V. O.; Tarasov, M. K.

doi:10.1134/s0097807817030071

Cited by 10 publications

(10 citation statements)

References 11 publications

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“…for period 1993–2013) around the time of sediment sampling in 2014 (16th of August 2014; Hydroweb, ). In addition, the sampled sediment locations at the delta front can be subject to wind waves, as observed by Chalov, Bazilova, and Tarasov ().…”

Section: Methodsmentioning

confidence: 86%

“…Relative change in water turbidity, Δ S (%) along the main channels of the Selenga River delta in western (blue point), central (green diamonds), and eastern (red triangles) parts (see Figure b)—data according to Chalov, Bazilova, et al (), ordered by months; bottom inset figures show the same data for specific months ordered by discharge magnitudes at Mostovoy station (Figure a). Grey curve indicate monthly average discharges at Mostovoy stations for period 1989–2014…”

Section: Discussionmentioning

confidence: 99%

“…Recent satellite image analysis on the Selenga River delta channels implies that at Q = 1,000–1,500 m 3 s −1 (which overlap with the herein considered moderate discharges), water turbidity decreases along the main channels of the delta. Moreover, for Q > 1,500 m 3 s −1 , turbidity is decreased (Chalov, Bazilova, et al, ). The same image analysis shows that during May and June (beginning of the vegetation growing season in the delta; Lane et al, ), turbidity increases, which implies net erosion along the channels.…”

Section: Discussionmentioning

confidence: 99%

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Sedimentation patterns in the Selenga River delta under changing hydroclimatic conditions

Pietroń

Nittrouer

Chalov

et al. 2018

Hydrological Processes

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The Selenga River delta (Russia) is a large (>600 km 2 ) fluvially dominated fresh water system that transfers water and sediment from an undammed drainage basin into Lake Baikal, a United Nations Educational, Scientific, and Cultural Organization World Heritage Site. Through sedimentation processes, the delta and its wetlands provide important environmental services, such as storage of sediment-bound pollutants (e.g., metals), thereby reducing their input to Lake Baikal. However, in the Selenga River delta and many other deltas of the world, there is a lack of knowledge regarding impacts of potential shifts in the flow regime (e.g., due to climate change and other anthropogenic impacts) on sedimentation processes, including sediment exchanges between deltaic channels and adjacent wetlands. This study uses field measurements of water velocities and sediment characteristics in the Selenga River delta, investigating conditions of moderate discharge, which have become more frequent over the past decades (at the expense of peak flows, Q > 1,350 m 3 s −1 ). The aims are to determine if the river system under moderate flow conditions is capable of supporting sediment export from the main distributary channels of the delta to the adjacent wetlands. The results show that most of the deposited sediment outside of the deltaic channels is characterized by a large proportion of silt and clay material (i.e., <63 μm). For example, floodplain lakes function as sinks of very fine sediment (e.g., 97% of sediment by weight < 63 μm).Additionally, bed material sediment is found to be transported outside of the channel margins during conditions of moderate and high water discharge conditions (Q ≥ 1,000 m 3 s −1 ). Submerged banks and marshlands located in the backwater zone of the delta accumulate sediment during such discharges, supporting wetland development. Thus, these regions likely sequester various metals bound to Selenga River sediment.

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Section: Methodsmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Sedimentation patterns in the Selenga River delta under changing hydroclimatic conditions

Pietroń

Nittrouer

Chalov

et al. 2018

Hydrological Processes

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“…Both deltas experience significant changes in water regime-decline in the case of Selenga river [28] and increase in the case of Upper Angara River [29]. Selenga 680 [30] 447,000 [30] 865 (1934-2015) [22] 6420 (1993) [22] 7 Mostovoy (150 km) Upper Angara 400 [31] 21,400 [31] 269 [31] 2 Verkhnyaya Zaimka (10 km) Kolyma 350 [32] 526,000 [32] 3210 [32] 42,900 (1999) [32] 2 Kolymskoe (150 km) Lena 32,000 [33] 2,430,000 [33] 16,800 (1935-2005) [32] 220,000 (1989) [32] 4 Kyusyur (380 km) The Lena River delta is the largest Arctic delta with an area of about 32 000 km 2 [32]. It consists of more than 800 branches with a total length of 6500 km.…”

Section: The Study Areamentioning

confidence: 99%

“…[6]. Applications of remote sensing data are the only plausible and efficient tool for identifying long-term sediment concentration patterns over extended river reaches [18,22]. Few studies [23,24] successfully demonstrated the capability of various satellite images to capture the spatial and temporal variability of suspended sediments over large rivers as well as smaller streams and plumes over riverocean interface [25,26].…”

Section: Introductionmentioning

confidence: 99%

North to South Variations in the Suspended Sediment Transport Budget within Large Siberian River Deltas Revealed by Remote Sensing Data

2021

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This study presents detailed suspended sediment budget for the four Siberian river deltas, representing contrasting conditions between Northern and Southern environments. Two of the studied rivers empty their water and sediments into the marine located in the permafrost zone in the Arctic region (Lena and Kolyma), and the other two (Selenga and Upper Angara) flow into Lake Baikal located in the steppe and forest-steppe zone of Southern Siberia. For the first time, these poorly monitored areas are analyzed in terms of the long-term and seasonal changes of spatial patterns of suspended sediment concentrations (SSC) over distributaries systems. Remote sensing reflectance is derived from continuous time series of Landsat images and calibrated with the onsite field measurements of SSC. Seasonal variability of suspended sediment changes over deltas was captured for the period from 1989 to 2020. We identify significant variability in the sedimentation processes between different deltas, which is explained by particularities of deltas networks and geomorphology and the existence of specific drivers—continuous permafrost impact in the North and abundant aquatic vegetation and wetland-dominated areas in the South. The study emphasizes that differences exist between Northern and Southern deltas regarding suspended sediments transport conditions. Mostly retention of suspended sediment is observed for Southern deltas due to sediment storage at submerged banks and marshlands located in the backwater zone of the delta during high discharges. In the Northern (arctic) deltas due to permafrost impacts (melting of the permafrost), the absence of sub-aquatic banks and river to ocean interactions of suspended sediment transport is mostly increased downwards, predominantly under higher discharges and along main distributary channels. These results shine light on the geochemical functions of the deltas and patterns of sequestering various metals bound to river sediments.

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Drivers and extent of surface water occurrence in the Selenga River Delta, Russia

Aminjafari

Brown

Chalov

et al. 2021

Journal of Hydrology: Regional Studies

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Suspended sediment balance in Selenga delta at the late XX–early XXI century: Simulation by LANDSAT satellite images

Cited by 10 publications

References 11 publications

Sedimentation patterns in the Selenga River delta under changing hydroclimatic conditions

Sedimentation patterns in the Selenga River delta under changing hydroclimatic conditions

North to South Variations in the Suspended Sediment Transport Budget within Large Siberian River Deltas Revealed by Remote Sensing Data

Drivers and extent of surface water occurrence in the Selenga River Delta, Russia

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