Studying the development of fluvial landforms in the Berettyó-Körös Region using geoinformatic methods
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Kiadó
University of Debrecen, Institute of Earth Sciences
Absztrakt
Leírás
Development of fluvial landforms from 1980 till nowadays was studied based on digital elevation maps(DEM) composed from contour lines of topographic maps, field data obtained by RTK GPS and aerialphotos taken by a drone. Greatest denudation of 6-9 metres was measured in the eastern side of theerosional valley at Pocsaj caused by piping and mass movements. As a result, the valley widened andslightly deepened. Since 1980 around 1-2 metres of accumulation and erosion of similar rate have beenmeasured in the secured floodplain environment dissected by abandoned beds, point-bars and swalesat Kismarja. These values, however, rather reflect the geometric uncertainties and deficiencies of thecontours of topographic maps than real land changes. Therefore topographic maps can give reliable basisfor studying the development of lowland landforms only if they depict adequately large sized (minimum100 x 100 m) positive or negative forms with great height difference as well (minimum 8-10 m). Accuracyof DEMs composed from aerial photos using photogrammetric methods – taking off height faults causedby vegetation – is around the same as that of the models created on the basis of RTK GPS measurements.
Kulcsszavak
floodplain accumulation, erosion, land-change study, DEM, photogrammetry, Berettyó