The species diversity of geomorphological processes involved in reshaping the topography of mouth areas of tidal rivers is identified. The geodynamic situation in the lower reaches of almost two hundred rivers that flow into seas and have tidal heights of 2 meters or more at their mouths is analyzed. It is shown that the greatest diversity in the alternation of river segments with different morphodynamic channel types is characteristic of river mouth areas of an estuarine–delta type. The study is conducted at various levels, focusing both on identifying general patterns of channel formation in delta and estuarine areas and on determining the leading processes that model river bank geosystems with direct participation of marine processes. At the macrolevel, the main types of morphodynamic processes involved in the morpho-lithogenesis of river mouth areas at all stages of their formation are identified; at the mesolevel, the varieties of morphodynamic channel types identified within the overall areas are determined. It is shown that the leading processes that influence the development of valley geosystems of tidal rivers are waterlogging, slope slumping, suffosion, and sheet erosion on bank ledges and sides of erosional forms. A special group of processes not encountered outside mouth areas of tidal rivers consists of wave erosion from the developed tidal bore and sediment accumulation at the upper boundary of the spread of tidal processes. In terms of the nature of manifestations and geomorphological processes that determine the modeling of the banks of tidal rivers, their reshaping is largely similar to the development of banks in lower reaches of reservoirs and, to a much lesser extent, to the formation of lowland river channels.
N. N. Nazarov (Mon,) studied this question.