Abstract
Abstract. Channel bank erosion was monitored using erosion pin arrays in a small mountain stream located in the Tsanyk River basin near the Caucasian Black sea coast. The study area is characterized by high precipitation, low mountainous topography, and flysch bedrock. Erosion pins arrays were installed at six key sections each with different bank lithology and morphology. Bank lithology (bedrock or alluvial deposits), morphology (vertical or concave) and orientation towards the local flow direction were the dominant factors controlling the rate of bank retreat and/or collapse. In contrast to alluvial banks, bedrock slopes are predominantly affected by chemical weathering processes in a wet subtropical climate. Results on sediment mobilization and volume removed are presented for different bank types. Variability in channel bank recessional dynamics is discussed in the context of hydrometeorological data (2016–2018) and an extreme flood.
Highlights
River channel bank erosion is controlled by a complex combination of factors and processes that play a key role in fluvial dynamics (Hooke, 1979)
The sediment erosion rates were highly variable depending on local morphology, hydro-climatological and weathering conditions within banks of differing lithology
The main drivers of bank erosion are lithology and its microscale variations, weathering, slope morphology, and bank orientation towards the flow direction. The contribution of these factors may vary substantially, and they all may play the main role in channel bank dynamics depending on local conditions
Summary
River channel bank erosion is controlled by a complex combination of factors and processes that play a key role in fluvial dynamics (Hooke, 1979). Channel bank retreat involves a combination of three primary mechanisms, which include subaerial weathering, mass failure and fluvial erosion (Thorne, 1982). Other processes such as creep and seepage erosion can be important under certain situations (Lawler, 1993). The wet subtropical area in Russia consists of low relief topography along a narrow strip of the Caucasian Black Sea coast (Fig. 1). This region is extremely popular among tourists because of its climate, topography and proximity to the sea and the region has experienced considerable growth of infrastructure in recent decades. Up to 85 % of the slopes in the Sochi administrative area are susceptible to landslides (Shoygu, 2010)
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