TRANSFORMATION OF THE HYDROGRAPHIC NETWORK OF ALMATY DUE TO ANTHROPOGENIC INFLUENCE

The article evaluates the transformation of the hydrographic network of urbanized territories using digital maps, on the example of the city of Almaty. Based on the plan-schemes for 1960, 1980, 1917, 1941 and 1981, maps of the city were compiled. To clarify the current state of the modern hydrographic network, the digitized map for 2015 was chosen as the basis. With the help of this, the total length of watercourses and the catchment area, the density of the hydrographic network were calculated, and their dynamics for the specified periods were also estimated. Artificial water bodies that eventually appeared on the territory of the city are described. The inclusion of artificial water bodies in the elements of the hydrographic network and the influence of the anthropogenic factor on natural water bodies are considered. The results of the study can be widely used in organizing measures for the water supply of the territory and minimizing the impact of harmful economic activity on water bodies.