Evaluating bedload transport rate in a river bed taking into account data on the active and passive bed-forms dynamics

Sidorchuk, A.

Авторы: Sidorchuk, A
Журнал: Water Resources
Том: 42
Номер: 1
Год издания: 2015
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 38
Последняя страница: 51
Оригинальные версии: ОЦЕНКА СТОКА ВЛЕКОМЫХ НАНОСОВ В РЕЧНОМ РУСЛЕ С УЧЕТОМ ДАННЫХ ОБ АКТИВНОЙ И ПАССИВНОЙ ДИНАМИКЕ ГРЯД
DOI: 10.1134/S009780781501011X
Аннотация: Bedform motion in river bed can be active or passive. The active motion is governed by wavelike structures of flow velocity field—the flow controls bed transformation. In this case, the bedforms are three dimensional and they move without unidirectional changes in their shape. The passive motion occurs when the flow structure becomes simpler, such that it is controlled only by the presence of a bedform relief. The bedforms become twodimensional and asymmetric, and in their motion, their crests move faster than troughs, thus making the bedform to skew. To assess bedload transport rate in the case of active motion of a hierarchic system of bedforms, it is necessary to sum bedload transported in the form of bedforms of all orders and to take into account the transit of bedload in the bedformfree form. In the case of passive motion, it is enough to evaluate the bedload transported as bedforms of a single order plus transit of bedload in the free form. Theoretical studies based on Exner’s approach show that an estimate of the transit transport of bedload in the free form can be derived from the velocities of passive motion of bedforms.
Добавил в систему: Сидорчук Алексей Юрьевич

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Evaluating bedload transport rate in a river bed taking into account data on the active and passive bed-forms dynamicsстатья

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