CONDITIONS OF FORMATION AND MORPHOLOGY OF ISLANDS IN THE ACTIVE AND PERIPHERAL ZONES OF THE CHANNELS OF LARGE PLAIN RIVERS

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

Islands, as the main elements of branched river channels, are well studied in terms of their formation and further development. For channels with wide floodplain, the main schemes of their formation and subsequent reshaping (transgressive, regressive) are proposed under conditions of multidirectional vertical and free development of horizontal channel deformations. However, the variety of branching types, their complex configuration and, often significant width of large lowland rivers causes uneven distribution of flow velocities and the occurrence of active and peripheral channel zones. The article provides an analysis of the conditions of formation, morphology and dynamics of islands depending on the intensity and direction of channel processes in different zones (parts) of the channel, and also shows the dependence of the island shape (length and width ratio) on their location in the channel, and, conversely, the impact of islands of different shapes on the flow structure. The location of the active and peripheral zones of the channel depending on the degree of its stability and morphodynamic type are illustrated on the examples of specific large and largest rivers. It is established that the localized zones of channel erosion or its shallowing develops in channels of any morphodynamic type, with various Wтр − WR+G ratios, and with positive or negative balance of sediments. Therefore, transgressive or regressive displacement of islands is considered to be a sign of the direction of vertical channel deformations (incision or directional accumulation) exclusively for the active part of the channel. In the peripheral zones of river channels, where local accumulation of sediments prevails, these patterns are not observed.

Авторлар туралы

R. Chalov

Lomonosov Moscow State University, Faculty of Geography

Хат алмасуға жауапты Автор.
Email: rschalov@mail.ru
Moscow, Russia

G. Golubtsov

Lomonosov Moscow State University, Faculty of Geography

Email: georgy1995golubcov@yandex.ru
Moscow, Russia

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