Arid
DOI10.1016/j.catena.2015.11.006
An approach to assess the impact of landscape connectivity and effective catchment area upon bedload sediment flux in Saco Creek Watershed, Semiarid Brazil
Souza, Jonas O. P.; Correa, Antonio C. B.; Brierley, Gary J.
通讯作者Souza, Jonas O. P.
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2016
卷号138页码:13-29
英文摘要

Sediment flux in semi-arid drainage networks is influenced by landscape connectivity, wherein natural land forms and hydro infrastructure networks such as low order dams impede the downstream transfer of sediment. This study analyzes how drainage impediments affect bedload transport within Saco Creek watershed, in semiarid northeast Brazil. Geomorphology and land use maps are constructed to assess changes to short term landscape connectivity. Bedload conveyance is appraised for precipitation/runoff events of variable magnitude frequency relationships. From this, ’effective’ rainfall events are determined. Analysis of the type and location/pattern of drainage impediments is used to assess effective catchment area under three distinct runoff scenarios. In the low magnitude event scenario, only 33.8% of the watershed area contributed effectively to sediment flux. In moderate and high magnitude events this value increased to 61.6% and 70.8% respectively. The relatively small variation from moderate to high magnitude events reflects the operation of dams which store bedload sediments. Findings from this study can be used to show how landscape connectivity analysis can support dam management in semiarid agrarian landscapes. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Landscape connectivity Semiarid environment Fluvial geomorphology Effective catchment area
类型Article
语种英语
国家Brazil
收录类别SCI-E
WOS记录号WOS:000368962100002
WOS关键词NEW-SOUTH-WALES ; CHANNEL ADJUSTMENTS ; WOLUMLA CATCHMENT ; LAND-USE ; RIVER ; SENSITIVITY ; VEGETATION ; STORAGE ; TIME ; (DIS)CONNECTIVITY
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/191981
作者单位Univ Fed Paraiba, Cidade Univ, BR-58059900 Joao Pessoa, Paraiba, Brazil
推荐引用方式
GB/T 7714
Souza, Jonas O. P.,Correa, Antonio C. B.,Brierley, Gary J.. An approach to assess the impact of landscape connectivity and effective catchment area upon bedload sediment flux in Saco Creek Watershed, Semiarid Brazil[J],2016,138:13-29.
APA Souza, Jonas O. P.,Correa, Antonio C. B.,&Brierley, Gary J..(2016).An approach to assess the impact of landscape connectivity and effective catchment area upon bedload sediment flux in Saco Creek Watershed, Semiarid Brazil.CATENA,138,13-29.
MLA Souza, Jonas O. P.,et al."An approach to assess the impact of landscape connectivity and effective catchment area upon bedload sediment flux in Saco Creek Watershed, Semiarid Brazil".CATENA 138(2016):13-29.
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