PECULIARITIES OF MAPPING GULLY EROSION ON THE EXAMPLES OF THE GULLIES OF THE VALLEY OF THE RIVER MUKIR
The article deals with the study of gully erosion and mapping of ravine-beam network using remote sensing data of the Earth and GIS-technology. The use of modern mapping methods in the study of gully erosion provides reliable, operational and scale morphometric characteristics and quantitative information on the rate of development of gullies. For the first time in the foothills of the Zhetysu Alatau mountains methods of terrestrial laser scanning and various space images were used to study the development of gully erosion. The investigations were carried out at the key section of ravines in the valley of the river Mukyr (Koksu District, Almaty Region, Republic of Kazakhstan), in the western part of the Zhetysu Alatau Mountains. In the autumn periods from 2012 to 2017 y. in Zhetysu region, semi-stationary observations and additional study of gully erosion in the valley of the river Mukyr (Koksu district) were carried out. The majority of ravines in this valley are growing, having an increase in the vertex and deep parts, mainly due to fluvial processes. The article contains the results of field and cameral research. For detailed instrumental study of ravines, a 3D laser scanner RIEGL VZ-4000 was used in the key area, which allowed to reveal the exact morphometric characteristics and rates of linear erosion. The factors influencing the development of gully erosion were studied, the number of gullies in the valley of the Mukyr River was obtained, the morphometric characteristics of ravines obtained on the basis of modern instruments and space images are given. The results of the analysis of the received field data, processing of space images and materials of different years are given. A map of the ravine-gullet network of the valley of the river Mukyr, a scheme for the growth of the summit and area development, longitudinal and transverse profiles of ravines, and the clas- sification of the digital elevation model by elevation are compiled.