|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Soil Erosion and Small River Aggradation in Russiaстатья
- Автор: Golosov V.
- Сборник: Proceedings of 12th ISCO Conference, May 26-31, 2002
- Год издания: 2002
- Место издания: Tsinghua University Press Beijing
- Первая страница: 154
- Последняя страница: 159
- Аннотация: Intensive soil erosion lead to transformation of sediment redistribution within river basin, because of increase of sediment input from slope to the river channel. Cultivation of interfluve and valley slopes within temperate climatic zone promotes to development sheet, rill and gully erosion. Intensive growth of cultivation area in Russia began from the southern part of forest zone and the northern part of forest-steppe zone in XVII century. Than area of intensive cultivation expanded in south and south-east directions and the rest of forest-steppe zone and steppe zone were ploughed during XVIII—XIX century. As a rule both rill and gully erosion rates increased dramatically immediately after cultivation, because of growth of surface runoff. From the other hand part of underground water decreased, that influenced on the summer water discharges of small rivers. Both these tendencies in connection with possible climatic fluctuations of precipitation across the agricultural part of Russia resulted in small river aggradation. Dynamic of small river aggradation were studied for different parts of agricultural zone of Russia using method of comparison of topographical maps composed for different time intervals. In addition the detail study of soil redistribution within small basins was undertaken for few key sites located in different landscape zone. Different methods and approaches were used for quantitative assessment the erosion and deposition rates and calculation of sediment budgets. The river net length decreases from 20%—30% in the northern part of forest-steppe zone up to 50%—70% in some parts of steppe zone. Moment of the most intensive disappearance of small rivers was observed immediately after quick increase of arable land area within the river basins. Addition increase in river aggradation was observed after cultivation of valley sides. It was established that the intensive river aggradation started when the area of arable lands exceeded 35% from the total area of river basin. However correlation between area of arable lands within basin and intensity of river aggradation do not exist. The key factors are the location of arable lands relatively river channels, intensity of soil erosion and trap effectiveness of dry creek bottoms along the pathways from cultivated field till the river channel.
- Добавил в систему: Голосов Валентин Николаевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | SoilErosionandSmallRiverAggradation.pdf | SoilErosionandSmallRiverAggradation.pdf | 927,5 КБ | 21 сентября 2015 [Golosov] | |
| 2. | SoilErosionandSmallRiverAggradation_1.pdf | SoilErosionandSmallRiverAggradation_1.pdf | 927,5 КБ | 21 сентября 2015 [Golosov] |