Modeling of the Suspended Matter Balance in the Selenga River Delta Using Remote Sensing Dataстатья
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Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
Аннотация:This paper describes a methodology developed for assessing the distribution of suspended sediment and metal fluxes along the Selenga delta channels and their accumulation by aquatic vegetation, based on the interpretation of Landsat-5, -7 and -8 and Sentinel-2/MSI satellite images, with clarification according to field data collected in 2011–2016. The methodology has great potential for application, because itallows to obtain quantitative characteristics of suspended sediment and metals balances based only on satellite images and data on discharges of suspended matter and metals at a delta apex. Calculation of the sediment budget allowed us to obtain the first quantitative data on the relationship of erosion-accumulation processes with water discharges in the Selenga River delta: for water discharges larger than 1500 m3/s, a steady predominance of sediment accumulation in the delta was observed. For smaller discharges there are cases of a longitudinal increase in the suspended sediment flux related with the backwater from Lake Baikal and channel erosion in the delta. On average, approximately 30% of the suspended sediment flux accumulates in the delta. Using the example of July 24, 2014, it was shown that 43% of the investigated metals flux (Mg, Al, Ti, Tl) accumulated in the delta. In the accumulation of metals, the channel and floodplain components account for 73 and 23%, respectively; and 3% is due to aquatic vegetation.DOI: 10.1134/S1875372821030124