干旱区生态环境知识资源中心(Arid): Unpaved rural roads as source areas of sediment in a watershed of the Brazilian semi-arid region

Arid

DOI	10.1016/j.ijsrc.2019.03.002
	Unpaved rural roads as source areas of sediment in a watershed of the Brazilian semi-arid region
	Lima Farias, Teresa Raquel 1; Augusto Medeiros, Pedro Henrique 1; Navarro-Hevia, Joaquin 2; de Araujo, Jose Carlos 3
通讯作者	de Araujo, Jose Carlos
来源期刊	INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
ISSN	1001-6279
出版年	2019
卷号	34 期号:5 页码:475-485
英文摘要	Approximately 80% of the road network in Brazil is unpaved and shows evidences of a high erosion potential. In the semi-arid Caatinga Biome in the northeast of the country, a monitoring programme has been done for two years in order to analyze runoff and sediment production from unpaved rural roadways and from embankments. Sediment production ranged from 0.30 to 0.92 Mg/ha yr, higher than in undisturbed areas, but generally lower than that reported for unpaved roads in other regions. However, this is a semi-arid area with low rainfall and runoff and, hence, with a limited hydrological connectivity and sediment production. Sediment production on an embankment with no vegetation was around ten times higher than on an embankment with vegetation. On the road surface, annual sediment production (normalized for gradient) in a section with traffic was three times higher than for a road surface without traffic. In addition, events that occurred after roadway maintenance activities generated peaks of sediment concentration of over 5000 mg/L. These results suggest that sediment production from roads and embankments with bare surfaces is at least one order of magnitude higher than in undisturbed catchment areas. Maintenance activity and vehicle traffic contribute to an increase in sediment availability and impact on the sediment concentration, but less intensely on sediment loads, which depend on the runoff magnitude of the events occurring after roadway maintenance. It was also found that the natural vegetation of the semi-arid region potentially captures sediment on roadway embankments; thereby playing an important role in breaking connectivity between the sediment flow from unpaved roads and the natural drainage system of the catchment. (C) 2019 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research. Published by Elsevier B.V. All rights reserved.
英文关键词	Sediment production Caatinga vegetation Road maintenance Embankment
类型	Article
语种	英语
国家	Brazil ; Spain
收录类别	SCI-E
WOS记录号	WOS:000474626000008
WOS关键词	FOREST ROADS ; ST-JOHN ; RUNOFF GENERATION ; SOIL-EROSION ; CATCHMENT ; YIELD ; CONNECTIVITY ; PREDICTION ; TRANSPORT ; IDAHO
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216521
作者单位	1.Fed Inst Educ Sci & Technol Ceara, Fortaleza, Ceara, Brazil; 2.Univ Valladolid, Campus Yutera, Palencia, Spain; 3.Univ Fed Ceara, Dept Agr Engn, Campus Pici,Bloco 804, BR-60450760 Fortaleza, Ceara, Brazil
推荐引用方式 GB/T 7714	Lima Farias, Teresa Raquel,Augusto Medeiros, Pedro Henrique,Navarro-Hevia, Joaquin,et al. Unpaved rural roads as source areas of sediment in a watershed of the Brazilian semi-arid region[J],2019,34(5):475-485.
APA	Lima Farias, Teresa Raquel,Augusto Medeiros, Pedro Henrique,Navarro-Hevia, Joaquin,&de Araujo, Jose Carlos.(2019).Unpaved rural roads as source areas of sediment in a watershed of the Brazilian semi-arid region.INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,34(5),475-485.
MLA	Lima Farias, Teresa Raquel,et al."Unpaved rural roads as source areas of sediment in a watershed of the Brazilian semi-arid region".INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH 34.5(2019):475-485.