Exceptional rainfall characteristics related to erosion risk in semiarid Tunisia
Författare
Summary, in English
The Tunisian Dorsal area is representative of the semiarid Mediterranean region in terms of water resources availability as well as exceptional rainfall characteristics, runoff generation, and soil loss risk. In this context, soil properties, surface management practices together with highly intensive rainfall make the soils vulnerable to erosion. If the exceptional rainfall characteristics are linked to different erosion types, the erosion risk could be evaluated in a simple and straightforward way. In this regard, a short time-scale rainfall data base from the Dorsal area was analysed in the paper. The procedure used involves finding a representative duration between 1-60 min for the exceptional rainfall characteristics.
Rainfall intensities of different return periods are then related to the different erosion types. The identified exceptional rainfall durations between 1-60 min were analyzed in terms of number of events, depth, average intensity and maximum intensity. Results show that the 15-min duration maximum intensity can be used to evaluate erosion risk based on soil erosion type. The developed methodology can be used to evaluate erosion risk in semiarid regions based on exceptional rainfall characteristics. In practical terms the results can be used to better manage catchments that are vulnerable to soil erosion.
Rainfall intensities of different return periods are then related to the different erosion types. The identified exceptional rainfall durations between 1-60 min were analyzed in terms of number of events, depth, average intensity and maximum intensity. Results show that the 15-min duration maximum intensity can be used to evaluate erosion risk based on soil erosion type. The developed methodology can be used to evaluate erosion risk in semiarid regions based on exceptional rainfall characteristics. In practical terms the results can be used to better manage catchments that are vulnerable to soil erosion.
Avdelning/ar
Publiceringsår
2008
Språk
Engelska
Sidor
25-33
Publikation/Tidskrift/Serie
Open Hydrology Journal
Volym
1
Dokumenttyp
Artikel i tidskrift
Förlag
Bentham Open, Bentham Science Publishers
Ämne
- Other Social Sciences
Nyckelord
- erosion processes
- return period
- rainfall characteristics
- exceptional event
- semiarid area
- Tunisia
- precipitation (meteorology)
Status
Published
Projekt
- The Middle East in the Contemporary World (MECW)
ISBN/ISSN/Övrigt
- ISSN: 1874-3781