Autore:
Azaiez, Naima Titolo:
Soil erosion measurement using fallout Cesium 137 technique in Sidi Salah Basin (Eastern Central Tunisia)Periodico:
Geoprogress journalAnno:
2020 - Volume:
7 - Fascicolo:
1 - Pagina iniziale:
11 - Pagina finale:
35According to FAO, Tunisia is classified among the countries worst hit by different
processes of soil degradation, particularly the semi-arid domain, making the example
of an ecosystem with increased steppization. Climatic deterioration and inadequate
reckless human intervention have led to a deterioration of edaphic factors accompanied
by a progressive invasion by steppe facies at the expense of a previously dense and
stable forest. This change in landscape has exposed the domain to a severe erosive
manifestation and has attracted the attention of many researchers on the problem of
water erosion which has been weighing heavily on rural communities for decades.
Efforts aimed at estimating soil losses have been made worldwide to choose adequate
ways of intervention and deal with this significant degradation. Different empirical
models have been established, tested and compared to have a quantitative estimation
of this degradation (Tamura, 1964; Rogowski and Tamura, 1970 a and b; Kachanoski
et al., 1984, 1987 and 1993; Mabit et al., 1999, 2002, 2008 and 2013; Moukhchane,
2008; Felah 2010; Azaiez, 2016 and 2020 and Akwasi et al., 2020). In this context, it
was proposed to quantify soil losses in a test watershed through the Cesium 137
method known for its preferential absorption by the soil’s fine particles and its high
sensitivity to mechanical erosion. To do this, a representative transect has been
selected in a small basin of 2.3 km2
in area, that of wadi Sidi Salah located on the semiarid margins of the Eastern tell. Seven samples have been taken along the transect
oriented by the soil loss map issued from the application of the USLE equation,
allowing to integrate as many compartments subject to various erosive factors and
processes as possible. The results of the modeling of soil loss through the Cesium 137
technique have shown a significant specific loss of 32.5 t / ha / year but one which is
variable between the different compartments of the basin.
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SICI: 2384-9398(2020)7:1<11:SEMUFC>2.0.ZU;2-X
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