The article presents an example of application of the Terrestrial Laser Scanning (TLS) technology in high definition surveys and recording results of geomorphical events, as well as in the assessment of the dynamics of transformations of the small paraglacial Tyvjobekken Stream valley. The field works involved the application of a Leica Scan Station C10 and GPS RTK global positioning system. The Tyvjobekken Stream is a paraglacial tributary catchment typical of the Arctic morphoclimatic zone. It is located in the NW part of the Wedel-Jarlsberg Land (Spitsbergen, Svalbard). A complex survey of the main part of catchment (central and lower part of the valley) was carried out from 24 interrelated measurement sites. 3D scanning at each of the sites resulted in a point cloud of 5 million points [M pt.]. The resulting cloud of 170 M pt. of data was used to create a digital elevation model [DEM] of the river valley with a length of more than 1.2 km and width of up to 0.45 km. The DEM developed based on the TLS survey, featuring high point density, permitted the determination of the basic hypsometric parameters of the analysed part of the catchment and valley floor, and comparison of the parameters of the asymmetric slopes of the valley’s mouth section. The high accuracy of the obtained model permitted precise identification of the geometry of the main slope and valley floor landforms, as well as the identification and inventory of ephemeral rills and braided channels.