干旱区生态环境知识资源中心(Arid): Quantitative analysis and implications of drainage morphometry of the Agula watershed in the semi-arid northern Ethiopia

Arid

DOI	10.1007/s13201-017-0534-4
	Quantitative analysis and implications of drainage morphometry of the Agula watershed in the semi-arid northern Ethiopia
	Fenta, Ayele Almaw; Yasuda, Hiroshi; Shimizu, Katsuyuki; Haregeweyn, Nigussie; Woldearegay, Kifle
通讯作者	Fenta, AA
来源期刊	APPLIED WATER SCIENCE
ISSN	2190-5487
EISSN	2190-5495
出版年	2017
卷号	7 期号:7 页码:3825-3840
英文摘要	This study aimed at quantitative analysis of morphometric parameters of Agula watershed and its sub-watersheds using remote sensing data, geographic information system, and statistical methods. Morphometric parameters were evaluated from four perspectives: drainage network, watershed geometry, drainage texture, and relief characteristics. A sixth-order river drains Agula watershed and the drainage network is mainly dendritic type. The mean bifurcation ratio (R (b)) was 4.46 and at sub-watershed scale, high R (b) values (R (b) > 5) were observed which might be expected in regions of steeply sloping terrain. The longest flow path of Agula watershed is 48.5 km, with knickpoints along the main river which could be attributed to change of lithology and major faults which are common along the rift escarpments. The watershed has elongated shape suggesting low peak flows for longer duration and hence easier flood management. The drainage texture analysis revealed fine drainage which implies the dominance of impermeable soft rock with low resistance against erosion. High relief and steep slopes dominates, by which rough landforms (hills, breaks, and low mountains) make up 76% of the watershed. The S-shaped hypsometric curve with hypsometric integral of 0.4 suggests that Agula watershed is in equilibrium or mature stage of geomorphic evolution. At sub-watershed scale, the derived morphometric parameters were grouped into three clusters (low, moderate, and high) and considerable spatial variability was observed. The results of this study provide information on drainage morphometry that can help better understand the watershed characteristics and serve as a basis for improved planning, management, and decision making to ensure sustainable use of watershed resources.
英文关键词	Morphometric analysis Watershed characteristics Remote sensing Geographic information system Semi-arid Ethiopia
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000413254300034
WOS关键词	DIGITAL ELEVATION MODELS ; RIVER-BASIN ; EROSION ; STREAMFLOW ; HIGHLANDS ; SYSTEMS ; AREA ; SOIL ; DEM
WOS类目	Water Resources
WOS研究方向	Water Resources
Scopus学科分类	Mekelle Univ, Dept Land Resources Management & Environm Protect, POB 231, Mekelle, Ethiopia.
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/332324
作者单位	[Fenta, Ayele Almaw; Yasuda, Hiroshi] Tottori Univ, Arid Land Res Ctr, 1390 Hamasaka, Tottori 6800001, Japan; [Fenta, Ayele Almaw] Mekelle Univ, Dept Land Resources Management & Environm Protect, POB 231, Mekelle, Ethiopia; [Shimizu, Katsuyuki] Tottori Univ, Fac Agr, 4-101 Koyamacho Minami, Tottori 6808553, Japan; [Haregeweyn, Nigussie] Tottori Univ, Int Platform Dryland Res & Educ, 1390 Hamasaka, Tottori 6800001, Japan; [Woldearegay, Kifle] Mekelle Univ, Dept Earth Sci, POB 231, Mekelle, Ethiopia
推荐引用方式 GB/T 7714	Fenta, Ayele Almaw,Yasuda, Hiroshi,Shimizu, Katsuyuki,et al. Quantitative analysis and implications of drainage morphometry of the Agula watershed in the semi-arid northern Ethiopia[J],2017,7(7):3825-3840.
APA	Fenta, Ayele Almaw,Yasuda, Hiroshi,Shimizu, Katsuyuki,Haregeweyn, Nigussie,&Woldearegay, Kifle.(2017).Quantitative analysis and implications of drainage morphometry of the Agula watershed in the semi-arid northern Ethiopia.APPLIED WATER SCIENCE,7(7),3825-3840.
MLA	Fenta, Ayele Almaw,et al."Quantitative analysis and implications of drainage morphometry of the Agula watershed in the semi-arid northern Ethiopia".APPLIED WATER SCIENCE 7.7(2017):3825-3840.