Scholarly record
TERRESTRIAL LASER SCANNING METHOD FOR MONITORING EROSION OF THE SOUTHWESTERN SHORE OF ALAKOL LAKE
Abstract
The purpose of this study is to follow the dynamics of erosion on the Alakol lake coasts using terrestrial laser scanner (TLS), which are leading to major changes of embossed medium, endanger the existing infrastructure and hinder the development of recreational coastal zone. The main steps in applying the ground-based laser scanning method are as follows: pre-paratory work for field-based radar systems; TLS data collection with laser scanner RIEGL VZ-4000; processing the received data in the RiscanPro program; analysis of multi-temporal digital elevation models (DEM). Four monitoring sites were selected on the southwestern coast of the Alakol lake, where abrasion is actively developing. The results of DTM processing made it possible to determine the numerical values of the coastline dynamics for 4 monitoring sites of the Alakol lake for 2018-2019. In sec-tion No. 1, the dynamics of coastal retreat ranged from 5.5 to 6 m, with a height of the coastal ledge of 3.5-4.5 m. With coverage of 200 m along the coastal section, erosion amounted to 3394 m3. In section No. 2, the dynamics of coastal retreat ranged from 1.3 to 2 m, with a height of the coastal ledge of 2.2-3.7 m. With coverage of 150 m along the coastal section, erosion amounted to 2794 m3. In section No. 3, the dynamics of coastal retreat ranged from 7.2 to 7.4 m, with a height of the coastal ledge of 1.2-1.5 m. With coverage of 100 m along the coastal section, erosion volume amounted to 2199 m3. In section No. 4, the dynamics of coastal retreat ranged from 1.3 to 4 m, with a height of the coastal ledge of 7.2-9 m., erosion of the coastal area with a coverage of 200 m amounted to a maximum volume of 5536 m3. The results revealed patterns of changes in the configuration of the coastline depending on the height of the coast and lithological composition. The average retreat rate of the southwestern coast of the lake is 3.92 m / year and the processed average volume of soil masses of the coastal ledge contains 2142m? / 100m. The described shooting method allows to calculate the volumes of the rates of shore erosion and coastline profiling. The systematic and long-term use of the TLS method in studying the relief-forming processes of the coast will contribute to solving problems associated with coastal erosion, in particular, reduce the negative impact of abrasion on natural coastal landscapes and infrastructure.
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