干旱区生态环境知识资源中心(Arid): Dynamics of ephemeral streams at the foot of degraded catchments in northern Ethiopia

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DOI	10.1002/ldr.3474
	Dynamics of ephemeral streams at the foot of degraded catchments in northern Ethiopia
	Demissie, Biadgilgn 1,2,3; Van Eetvelde, Veerle 3; Frankl, Amaury 3; Billi, Paolo 4; Asfaha, Tesfaalem G.1; Haile, Mitiku 5; Nyssen, Jan 3
通讯作者	Demissie, Biadgilgn
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2020
卷号	31 期号:5 页码:591-606
英文摘要	The magnitudes of flash floods and their effect on channel width changes were investigated for Hara River in the Raya graben (northern Ethiopia). Precipitation was measured using rain gauges evenly distributed over the study catchment. Event peak discharges were measured with crest-stage gauges at a reference cross-section. Changes in channel width were measured at six monitoring sites along a 1.5 km long reach. Decadal channel width change was analyzed over the period 1965-2014. The average rainfall depth of the rainy days was 14.2 +/- 9.4 mm whereas the highest was 41.9 mm and the lowest, capable to generate some flow in the river, was only 1.8 mm. The maximum calculated discharge peaked at 408 m(3)/s whereas the lowest flow was 19.5 m(3)/s. An average widening of 0.11 +/- 0.19 m per flood (for a total of 3.74 m) was measured. The cumulative precipitation and cumulative channel widening suggest that larger and longer lasting rains have substantial influence on channel width change. A marked increase in channel width commonly accompanies 2-3 days of flood duration; it is less marked where there is riparian vegetation on the banks. The long-term (1965, 1986, 2005, and 2010) measurements indicate that channel width increased rapidly over the last 50 years; nearly 25 m of widening. Generally, channel changes are mainly induced by the duration of floods rather than by their intensity and the data clearly show that ephemeral streams channel dynamics can be triggered also by floods much smaller than bankfull.
英文关键词	bank protection bankfull discharge channel dynamics dryland ephemeral streams
类型	Article
语种	英语
国家	Ethiopia ; Belgium ; Japan
收录类别	SCI-E
WOS记录号	WOS:000502130600001
WOS关键词	RIFT-VALLEY ESCARPMENT ; RIPARIAN VEGETATION ; SEDIMENT TRANSPORT ; CHANNEL MORPHOLOGY ; MOUNTAIN STREAMS ; ARID-REGION ; CHECK DAMS ; KOBO BASIN ; LAND-USE ; RIVER
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
EI主题词	2019-12-09
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311648
作者单位	1.Mekelle Univ, Dept Geog & Environm Studies, Mekelle, Ethiopia; 2.Mekelle Univ, Inst Geoinformat & Earth Observat Sci, Mekelle, Ethiopia; 3.Univ Ghent, Dept Geog, Ghent, Belgium; 4.Tottori Univ, Int Platform Dryland Res & Educ, Tottori, Japan; 5.Mekelle Univ, Dept Land Resource Management & Environm Protect, Mekelle, Ethiopia
推荐引用方式 GB/T 7714	Demissie, Biadgilgn,Van Eetvelde, Veerle,Frankl, Amaury,et al. Dynamics of ephemeral streams at the foot of degraded catchments in northern Ethiopia[J],2020,31(5):591-606.
APA	Demissie, Biadgilgn.,Van Eetvelde, Veerle.,Frankl, Amaury.,Billi, Paolo.,Asfaha, Tesfaalem G..,...&Nyssen, Jan.(2020).Dynamics of ephemeral streams at the foot of degraded catchments in northern Ethiopia.LAND DEGRADATION & DEVELOPMENT,31(5),591-606.
MLA	Demissie, Biadgilgn,et al."Dynamics of ephemeral streams at the foot of degraded catchments in northern Ethiopia".LAND DEGRADATION & DEVELOPMENT 31.5(2020):591-606.