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ANALYSIS OF SOIL EROSION IN TATA VALLEY WATERSHED USING ROMSEM MODEL AND GIS
Abstract
In the present work the researches were carried out between 2017-2020, in the Tata Valley watershed, which has an area of 16.15 sq. km and administratively belongs to Dambovita county, Romania and is located between latitudes of 45o9’ N-45o15’ N and longitudes 21o21’ E-25o27’ E. The methodology used for processing the basic data from 2017-2020, was the adaptation of the USLE equation (Universal Soil Loss Equation) to the specific environmental and anthropic conditions in Romania and called ROMSEM - Romanian Soil Erosion Model. The lack of database and field measurements for small watersheds can be a problem when validating the models applied to quantify soil erosion. Working methodology used to estimate the annual rate of surface erosion for Tata Valley watershed was based on the ROMSEM model together with the Digital Elevation Model (DEM), with a 30 m resolution, together with the soil map that was digitized at a scale of 1:10000, together with the land use map based on maps from Dambovita county Real Estate Cadastre and Advertising Office and corrected according to the 2020 ortophotos, together with the rainfall agressivity correction factor map for Romania as well as other information about distribution of soil erosion control works, in Tata Valley watershed. The results obtained indicate a mean annual value of soil loss by surface erosion of 2.59 t ha?1 year?1 ie 66.01 % of the studied area has tolerable values (<3 t ha-1 yr-1), especially on land surfaces covered with vegetation and 1.37 % of the studied watershed has very high erosion rates (>40 t ha-1 yr-1) especially on excessively eroded soils (non-productive fields) with very small cohesivity and no structure. As a general conclusion, although the vegetation in the northern part of the studied area ensures a good protection of the soil, the intensity of erosion increases there where the anthropogenic factor intervenes by the way and techniques of land use intensifies the erosion phenomenon.
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https://esdac.jrc.ec.europa.eu/themes/indicators-soil-erosion
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