Abstract
Soil erosion is a major environmental problem that threatens world food production; it can be described as the removal of organic as well as inorganic soil surface materials by wind and water. This (e present) study aims to identify the most erosion vulnerable sub-watersheds for planning appropriate conservation intervention and restoration measures in Jedeb watershed. Revised Universal Soil Loss Equation (RUSLE) integrated with satellite remote sensing (RS) and geographical information system (GIS) has been applied to calculate potential soil loss at sub-watershed level. The parameters of RUSLE model were estimated using remote sensing data and ArcGIS software. The rainfall erosivity R-factor was found from 3209.6 to 3896.69 MJ.mm/ (ha.h), soil erodibility K-factor varies from 0.1 to 0.25 t ha h/ (ha MJ mm), Topographic (LS factor) ranging from 0.19 to 6.7, C-factor varies 0.01 to 0.25 and support practice P-factors from 0.1 to 1. The total annual soil loss potential of the study area was found 1,383,158 t/ yr from the total watershed area of 29,633 ha. Average annual soil loss at sub-watersheds level was estimated from 29.275 to72.529 t/ha/year and mean annual soil loss of the entire watershed was 46t/ha/year. The study results indicated that potential soil erosion rate in the watershed was ranged into four priority categories from high to extremely severe. Three sub-watersheds covering 22.975% of the watershed shows very severe mean soil loss rate, two sub-watersheds was found severe mean soil rate which covered 19.014%, eight sub-watershed were existed under very high mean soil loss rate covers 47.59% and Three sub-watersheds were found in the high soil loss rate and covers 10.42%. Sever and extremely severe micro watersheds demand immediate attention in terms of management and planning perspective. Soil and water conservation structure was recommended and designed based on peak runoff rate, soil type, slope of the land, land use type and soil erosion hazard . Keywords : Soil Erosion; RUSLE; GIS; Soil Conservation; Jedeb watershed; Ethiopia DOI: 10.7176/JNSR/10-9-02 Publication date: May 31 st 2020
Highlights
Land degradation is one of the most serious ecological problems in the world (Ayad, 2009)
The smaller R-factor was found in the downstream part of the study area indicating that this part of the study area was less vulnerable to erosion where as the upstream part of the study area was more vulnerable to erosion (Figure 2)
Revised Universal Soil Loss Equation (RUSLE) model integrated with satellite remote sensing and geographical information systems had provided useful information for the assessment and decision-making about the vulnerability of sub-watersheds for undertaking required conservation measures
Summary
Land degradation is one of the most serious ecological problems in the world (Ayad, 2009). Soil erosion is a major environmental problem that threatens world food production (Dudal, 1981). Soil erosion has negative effects on the standard of living of the inhabitants, especially in developing countries like Ethiopia, where agriculture is considered as the main source of peoples’ income and food (Hurni, 1993). It is the most serious form of land degradation, in which its on-site and off-site effects threaten the food security and the national economy of the country (Hurni, 1993; Sutcliff, 1993; Lulseged and Vlek, 2005)
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