DOI: 10.5194/hess-21-235-2017
Scopus记录号: 2-s2.0-85009241584
论文题名: Reconstructing long-term gully dynamics in Mediterranean agricultural areas
作者: Hayas A ; , Vanwalleghem T ; , Laguna A ; , Penã A ; , Giráldez J ; V
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 1 起始页码: 235
结束页码: 249
语种: 英语
Scopus关键词: Dynamics
; Erosion
; Land use
; Rain
; Aerial Photographs
; Agricultural areas
; High temporal resolution
; Long term dynamics
; Main controlling factors
; Mediterranean areas
; Mediterranean basin
; Sediment production
; Landforms
; aerial photography
; drainage network
; gully erosion
; interpolation
; land use planning
; Mediterranean environment
; morphodynamics
; precipitation assessment
; sediment yield
; timescale
; Spain
英文摘要: Gully erosion is an important erosive process in Mediterranean basins. However, the long-term dynamics of gully networks and the variations in sediment production in gullies are not well known. Available studies are often conducted only over a few years, while many gully networks form, grow, and change in response to environmental and land use or management changes over a long period. In order to clarify the effect of these changes, it is important to analyse the evolution of the gully network with a high temporal resolution. This study aims at analysing gully morphodynamics over a long timescale (1956-2013) in a large Mediterranean area in order to quantify gully erosion processes and their contribution to overall sediment dynamics. A gully network of 20km2 located in southwestern Spain has been analysed using a sequence of 10 aerial photographs in the period 1956-2013. The extension of the gully network both increased and decreased in the study period. Gully drainage density varied between 1.93km-2 in 1956, a minimum of 1.37km-2 in 1980, and a maximum of 5.40km-2 in 2013. The main controlling factor of gully activity appeared to be rainfall. Land use changes were found to have only a secondary effect. A new Monte Carlo-based approach was proposed to reconstruct gully erosion rates from orthophotos. Gully erosion rates were found to be relatively stable between 1956 and 2009, with a mean value of 11.2tha-1yr-1. In the period 2009-2011, characterized by severe winter rainfalls, this value increased significantly to 591tha-1yr-1. These results show that gully erosion rates are highly variable and that a simple interpolation between the starting and ending dates greatly underestimates gully contribution during certain years, such as, for example, between 2009 and 2011. This illustrates the importance of the methodology applied using a high temporal resolution of orthophotos. © 2017 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79296
Appears in Collections: 气候变化事实与影响
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作者单位: University of Cordoba, Dept. of Agronomy, Da Vinci Bldg., Cra Madrid kmg 396, Córdoba, Spain; University of Cordoba, Dept. of Applied Physics, Einstein Bldg., Córdoba, Spain; University of Cordoba, Dept. of Rural Engineering, Da Vinci Bldg., Córdoba, Spain; Institute for Sustainable Agriculture, CSIC, Dept. of Agronomy, Alameda del Obispo, Córdoba, Spain
Recommended Citation:
Hayas A,, Vanwalleghem T,, Laguna A,et al. Reconstructing long-term gully dynamics in Mediterranean agricultural areas[J]. Hydrology and Earth System Sciences,2017-01-01,21(1)