DSpace

Digital.CSIC > Ciencias Agrarias > Centro de Edafología y Biología Aplicada del Segura (CEBAS) > (CEBAS) Artículos >

Share

EndNote

Impact

Links

Closed Access item Hydrological and erosional response to natural rainfall in a semi-arid area of south-east Spain

Authors:Martínez-Mena García, M. Dolores
Castillo Sánchez, Victor Manuel
Albaladejo Montoro, Juan
Keywords:Soil erosion, Runoff, Sediment, Mediterranean areas
Issue Date:13-Mar-2001
Publisher:John Wiley & Sons
Citation:Hydrological Processes 15(4): 557-571 (2001)
Abstract:A better knowledge of soil erosion by water is essential for planning effective soil and water conservation practices in semi-arid Mediterranean environments. The special climatic and hydrological characteristics of these areas, however, make accurate soil loss predictions difficult, particularly in the absence of minimal data. Two zero-order experimental microcatchments (328-759 m2), representative of an extensive semi-arid watershed with a high potential erosion risk in the south-east of Spain, were selected and monitored for 3 years (1991-93) in order to provide information on the hydrological and erosional response. A pluviogram and hydrograph recorded data at 1-min intervals during each storm, after which the soil loss was collected and the particle size of the sediment was analysed. Runoff coefficients of about 9% and soil losses of between 84·83 and 298·9 g m-2 year-1 were observed in the area. Rapid response times (geometric mean values lower than 2 h) and low runoff thresholds (mean values between 3·5 to 5·9 mm) were the norm in the experimental areas. A rain intensity of over 15 mm h-1 was considered as erosive rainfall in these areas because of the total soil loss and the transport capacity of the overland flow. Differences in pore-size distribution explained the different hydrological responses observed between areas. The erosional response was more complex and basically seemed to be determined by soil aggregate stability and topographical properties. A greater proportion of finer particles in the eroded material than in the soil matrix indicated selective erosion and the transport of finer material.
Publisher version (URL):http://dx.doi.org/10.1002/hyp.146
URI:http://hdl.handle.net/10261/16599
ISSN:1099-1085 (Online)
0885-6087 (Print)
???metadata.dc.identifier.doi???:10.1002/hyp.146
Appears in Collections:(CEBAS) Artículos

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.