Dynamic Model of Gully Erosion

Sidorchuk, A.

Автор: Sidorchuk A.
Сборник: Modelling soil erosion by water
Год издания: 1998
Место издания: Springer
Первая страница: 451
Последняя страница: 460
Аннотация: The main causes of gullies formation are anthropogenic factors: the clearing of native forests, tilling of fallow lands and associated change of the hydrological conditions in the rainfall-runoff system. Gully channels formation is very intensive during the period of gully initiation, when gully morphological characteristics (length, depth, width, area, volume) are far from stable .About 80 per cent of gully length, 60 per cent of its area and 35 per cent of volume are formed only at 5 per cent of gully lifetime. This stage of gully development can be described with use of the dynamic model to predict rapid changes of gully morphology. The dynamic gully model is based on the solution of the equations of mass conservation and gully bed and walls deformations. The analysis of experimental results shows, that the rate of soil particles detachment is linearly correlated with the product of bed shear stress and mean flow velocity : In this case basic equations were written in the form of transport equation and solved with the use of explicit predictor- corrector scheme of Lax-Wendroff type. The side walls of the gully became practically straight after rapid sliding, following the incision. A straight stable slope model was used for prediction of gully side walls inclination. This dynamic gully erosion model was verified on the data on gullies morphology and dynamics from Yamal peninsula (Russia) and New South Wales (Australia).
Добавил в систему: Сидорчук Алексей Юрьевич

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