Assessment of magnetite as a sediment tracer in the study of ephemeral gully erosion: Application and distribution in the soil

2021 ◽  
Author(s):  
Elena Zubieta ◽  
Juan C. Larrasoaña ◽  
Alaitz Aldaz ◽  
Javier Casalí ◽  
Rafael Giménez
Keyword(s):  
Gully Erosion ◽  
Ephemeral Gully ◽  
Sediment Tracer

Assessment of magnetite as a magnetic tracer for sediments in the study of ephemeral gully erosion: conditioning factors of magnetic susceptibility

2021 ◽  
Author(s):  
Elena Zubieta ◽  
Juan C. Larrasoaña ◽  
Alaitz Aldaz ◽  
Javier Casalí ◽  
Rafael Giménez
Keyword(s):  
Magnetic Susceptibility ◽  
Gully Erosion ◽  
Conditioning Factors ◽  
Ephemeral Gully ◽  
Magnetic Tracer

Impacts of tillage practices on ephemeral gully erosion in a dry-hot valley region in southwestern China

2019 ◽  
Vol 187 ◽  
pp. 72-84 ◽  
Author(s):  
Li Rong ◽  
Xingwu Duan ◽  
Guangli Zhang ◽  
Zhijia Gu ◽  
Detai Feng
Keyword(s):  
Gully Erosion ◽  
Southwestern China ◽  
Tillage Practices ◽  
Ephemeral Gully

A field investigation on ephemeral gully erosion processes under different upslope inflow and sediment conditions

2019 ◽  
Vol 572 ◽  
pp. 517-527 ◽  
Author(s):  
Tongjia Wu ◽  
Chengzhong Pan ◽  
Changjia Li ◽  
Mingjie Luo ◽  
Xiaoyu Wang
Keyword(s):  
Field Investigation ◽  
Gully Erosion ◽  
Erosion Processes ◽  
Ephemeral Gully

An experimental study on dynamic processes of ephemeral gully erosion in loess landscapes

Geomorphology ◽  
2011 ◽  
Vol 125 (1) ◽  
pp. 203-213 ◽  
Author(s):  
J.G. Gong ◽  
Y.W. Jia ◽  
Z.H. Zhou ◽  
Y. Wang ◽  
W.L. Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gully Erosion ◽  
Dynamic Processes ◽  
Ephemeral Gully

Analysis and assessment of ephemeral gully erosion in wide areas of Navarre (Spain) from routinely obtained ortophotographs

2020 ◽  
Author(s):  
Youssef Chahor ◽  
Javier Casalí ◽  
Rafae Giménez
Keyword(s):  
Management Practices ◽  
Sudden Change ◽  
Low Frequency ◽  
Direct Methods ◽  
Gully Erosion ◽  
Aerial Photographs ◽  
Large Area ◽  
Small Watersheds ◽  
Ephemeral Gully ◽  
Ephemeral Gullies

<p>Ephemeral gullies (EG) are linear erosion features located in swales where runoff concentrates during or immediately after rainfall events. EG are temporary because they are easily filled by conventional machinery and cause important soil losses in cultivated areas. Casalí et al. (1999) distinguished three types of EG: “classical”, formed by concentrated runoff flows within the same field where runoff started; “drainage”, created by concentrated flows draining areas upstream from the field; “discontinuity”, found in places where management practices create a sudden change in slope. There is still a great lack of knowledge about the true extent and importance of this EG. In this sense, the information obtained from aerial photographs can be of great value. The main objective of this work is to evaluate the possibility of making an exhaustive characterization of the space-time evolution of ephemeral gullies in a relatively large area from color aerial photographs. The effect of precipitation on the EG will be also analyzed.</p><p>The 570 ha study area is almost completely cultivated with winter cereals and located in the Pitillas district (Navarre). Climate is Continental Mediterranean (on average 550  mm yr<sup>-1</sup>). Soil (upper horizons) are loam–silty loam in texture.</p><p>EG within cultivated fields were located, classified and digitized using GIS interfaces over seven colour orthophotos (1:5000 with 0.5mx0.5m resolution) taken between 2003 and 2014. Gully length was determined after locating EG down and upstream ends. EG drainage areas and slopes were determined using a 2 m resolution DEM.</p><p>To determine EG volumes, an empirical power model for the study area defining the relationship between EG lengths and volumes was first obtained from previous field measurement, and then used for the EG lengths from this study. The corresponding erosion rates were also calculated.</p><p>57 small watersheds affected by EGs were identified, being 39 of them classified as drainage EGs, and the remaining 18 EGs as classic. 70% of the small watersheds were affected by EG only once. In remaining watersheds EG reappeared from twice to seven times. Therefore, it seems that the repeatability is not as high as thought.</p><p>The average erosion rate in classical EG is about 1.1 Kg m<sup>-2</sup> year<sup>-1</sup>. Previous assessments using accurate direct methods reported an average value of 0.8 Kg m<sup>-2</sup> year<sup>-1</sup> for very similar watersheds in the same area. Although it is not a conclusive proof, this findings indicate that both methods provide similar results.</p><p>A very high correlation (r<sup>2</sup>= 0.84) has been found between the length of the gullies formed in the study area and the total annual precipitation. It would follow that EG erosion would also be controlled by the overall amount of rainfall also in Mediterranean climates, and not only by high intensity-low frequency events.</p><p><strong>References</strong></p><ol><li>Casalí, J. J. López, J. V. Giráldez, 1999. Ephemeral gully erosion in Southern Navarra (Spain). CATENA 36: 65-84.</li> </ol>

Upslope inflow, hillslope gradient and rainfall intensity impacts on ephemeral gully erosion

2017 ◽  
Vol 28 (8) ◽  
pp. 2623-2635 ◽  
Author(s):  
Ximeng Xu ◽  
Fenli Zheng ◽  
Glenn V. Wilson ◽  
Min Wu
Keyword(s):  
Rainfall Intensity ◽  
Gully Erosion ◽  
Ephemeral Gully

Quantifying interrill and ephemeral gully erosion in a small Sicilian basin interrill and ephemeral gully erosion in a small Sicilian basin

2012 ◽  
Vol 56 (1) ◽  
pp. 9-25 ◽  
Author(s):  
A. Capra ◽  
V. Ferro ◽  
P. Porto ◽  
B. Scicolone
Keyword(s):  
Gully Erosion ◽  
Ephemeral Gully

Ephemeral gully erosion in northwestern Spain

CATENA ◽  
2003 ◽  
Vol 50 (2-4) ◽  
pp. 199-216 ◽  
Author(s):  
M Valcárcel ◽  
Ma̱.T Taboada ◽  
A Paz ◽  
J Dafonte
Keyword(s):  
Gully Erosion ◽  
Ephemeral Gully ◽  
Northwestern Spain
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