استفاده از سزیوم-۱۳۷ برای بررسی میزان فرسایش و رسوب درحوضه آبخیز گرگک استان چهار محال و بختیاری

In view of the many limitations associated with traditional approaches to documenting soil erosion and sedimentation rates, the potential for using fallout radionuclides as tracers in soil erosion investigations has been increasingly exploited. Most attention has been focused on caesium-۱۳۷, and the successful use of this bomb-derived radionuclide in soil erosion studies has now been reported for many areas in the world. The main goal of this research was to study the ۱۳۷Cs ۳-D distribution pattern within the key sites and to apply the obtained information for the assessment of soil redistribution. Hence, one transect on a hill slope in Gorgak basin of Chahar Mahal-e- Bakhtiary province  was selected and studied. Soils were sampled along the transect and analyzed for cesium-۱۳۷. The estimated erosion rates was about ۲۰۰ t/ha/yr  for the top of the slope soil profile (the shoulder landform), and about ۲۴.۸ t/ha/yr for the middle of the slope soil profile (backslope landform). In the footslope landform no erosion has been observed.

Keywords:

فرسایش خاک , رسوب , سزیوم-۱۳۷ , عنصر نشاندار , عارضه های سطحی , چهارمحال و بختیاری , بارش رادیونوکلئیدها