University of Khartoum

Assessment and Mapping of Wind Erosion in Northeast Butana Area

Assessment and Mapping of Wind Erosion in Northeast Butana Area

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Title: Assessment and Mapping of Wind Erosion in Northeast Butana Area
Author: Mohamed Salih Haikal, Sami
Abstract: A study was conducted in four sites representing Northeast Butana extending from the northern border of New Hlafa Agricultural Scheme (site 1) to the northern fringes of River Atbara Locality (Site 4). The objectives were to assess and map wind erosion. The four aspects of wind erosion namely status, rate, inherent risk and hazard of desertification caused by wind erosion in the area were studied. Also to test different methods and indicators used in estimation of wind erosion to develop tools and methods that are quantifiable, simple and locally adapted. The main methods used were direct measurement, remote sensing techniques and the parametric model developed by Woodruff and Siddoways (1965) Using percent cover of dunes/hummocks and that of gravels as indicators, sites 1, 2 and 3 were slightly affected by wind erosion. The status of wind erosion was very high at site 4 when percent cover by dunes/hummocks was used as an indicator. However, the indicator of percentage coverage by gravels failed in rating status at the dunes as they were free of gravels. However, using remote sensing technique the status of wind erosion in the four sites was moderate. Statistical analysis on the data collected by vertical and horizontal traps showed progressive northward increase in intensity of wind erosion (IWE). In site 3 and site 4, 78% of the total sand movement took place. The results also revealed existence of inverse relation between IWE and elevation above the ground level. It was found that 79% of the total collected sand was within one 0.3 m above the ground surface. The results, in general, showed increase in IWE from December to June. Although the southerly wind prevailing in summer is of shorter duration, it had a profound effect on wind erosion. Compared to the direct measurement the indicators based on remote sensing technique and that based on the parametric model under-estimated the IWE. However, by using remote sensing technique land units with different IWE could be delineated. The study showed that site 1 had moderate hazard of desertification caused by wind erosion. Sites 2 and 3 had high while site 4 had very high hazard of desertification caused by wind erosion. The main cause of the hazard was overstocking. Animal density in the area was found to be more than twice the carrying capacity.
URI: http://khartoumspace.uofk.edu/handle/123456789/9373
Date: 2015-04-23


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