Abstract
In the valley of the Surkhob River, manifestations of modern geological processes, characterized by various forms of manifestation, are widely developed. Studying these processes is of utmost importance, primarily landslides, which are directly related to the loss of stability of rocks on the slopes. Landslide processes in the Surkhob River valley, regardless of their type, cause significant economic damage to the population and the economy, as well as negatively impacting human living conditions. The primary goal of this project is to map landslide susceptibility using a geographic information system and quantitative and semi-quantitative methods. Landslide susceptibility assessment of this research was conducted using slope (degree), aspect of the slope, curvature, stream power index, topographic wetness index, precipitation and altitude. Except for precipitation, which was collected from the world climate site, most of the causal elements were derived from DEM from the SRTM (Shuttle Radar Topography Mission) database, with cell sizes of 30 m. 416 landslides were discovered from satellite pictures of Google Earth Pro and then validated in the field to analyses the link between causative factors and landslide inventory. To measure the weights of each causal element, the frequency ratio (FR) and the analytical hierarchy process (AHP) were used. The quality of the landslide susceptibility map was determined using the Receiver Operating Characteristics curve (ROC), and the AUC value was determined to be 0.877. It is possible to use the landslide susceptibility map as an engineering and geological basis for establishing a national economic development plan for the territory of the Surkhob River valley.
Highlights
One of the main directions of the economic development of Tajikistan is the development of territories with unfavorable engineering and geological conditions
In the valley of the Surkhob River, manifestations of modern geological processes, characterized by various forms of manifestation, are widely developed. Studying these processes is of utmost importance, primarily landslides, which are directly related to the loss of stability of rocks on the slopes
Except for precipitation, which was collected from the world climate site, most of the causal elements were derived from digital elevation model (DEM) from the shuttle radar topography mission (SRTM) (Shuttle Radar Topography Mission) database, with cell sizes of 30 m. 416 landslides were discovered from satellite pictures of Google Earth Pro and validated in the field to analyses the link between causative factors and landslide inventory
Summary
One of the main directions of the economic development of Tajikistan is the development of territories with unfavorable engineering and geological conditions. Improving environmental protection, strengthening work on the preservation of agricultural land and ensuring the protection of lands from landslides is urgent issue. Such territories include the valley of the Surkhob River, which is subject to the intense impact of the landslide process. The Surkhob River valley is located in a zone of continuous landslide development, the causes of which are geological, tectonic, seismological, hydrogeological, and climatic factors. Vakhsh thrust as a complexly constructed folded-thrust zone, covering the entire southern flank of the river valley. Surkhob to the watershed of the Peter the Great ridge has a distinct geological structure in the valley of the Surkhob River landslides and are common in areas where Cretaceous and Quaternary sediments develop
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