HISTORICAL TERRAIN CHANGES MAPPING DUE TO THE WIND EROSIONDEGRADATION PROCESSES

摘要

In this paper we compare the Digital terrain model (DTM) created from contours extracted from the Base Map of Slovakia with the scale of 1 :10000 from year 1970 and DTM derived from the points measured with the Trimble~R R8 GPS receiver with TSC2 dataloggers from 2013.The purpose of the provision of these DMTs is to create baseline information that we used in quantifying physical changes due to wind erosion processes in the terrain of selected field in 43 years, since 1970 to present 2013. The comparison of the DTMs was validated by the volumetric method during wind erosion event. The results achieved from the volumetric method show that in one erosion event, about 480 m~3 of soil has been eroded and transported to another location. In DTM comparison (43 years) volume amount which was calculated by "3D analyst tool - terrain and TIN surface - Surface difference", 31,228 m~3 of eroded soil was accumulated in the area and 16,236 m~3 was lost from the area. Totally 14,922 m~3 (5.5 cm height across the whole field) was transported from outlying eroded fields.