A sheet erodibility parameter for water erosion modeling in regions with low intensity rain
| Autor: | Mohammad H. Hussein |
|---|---|
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Hydrology Research. 44:1013-1021 |
| ISSN: | 2224-7955 0029-1277 |
| DOI: | 10.2166/nh.2013.029 |
| Popis: | Soil erodibility reflects the soil effect on the detachment process by rainfall and runoff; an evaluation of this parameter for single storm events was carried out using natural runoff plot data collected for two rainfall seasons in northern Iraq. The region is characterized by a semiarid Mediterranean-type climate with normal rainfall intensity below 20 mm/h and dominant sheet erosion on agricultural land. The plots were three 30 × 3 m and three 10 × 3 m, in fallow, situated on a 6% uniform slope; the soil at the site has a silty clay loam texture and belongs to the Calciorthid suborder. Sheet erosion rate was assumed linearly proportional to the storm power and the sheet flow power; a steady-state turbulent and kinematic sheet flow was also assumed. The results indicated a dominant detachment by rainfall with a substantial variability in storm by storm calculated sheet erodibility. The two-parameter lognormal probability distribution fitted the obtained sheet erodibility values reasonably well. Using this probability distribution, a representative sheet erodibility value of 0.056 × 10−3kg/J was obtained for use at the experimental site. |
| Databáze: | OpenAIRE |
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