干旱区生态环境知识资源中心(Arid): Impacts of extreme rainfalls in the year 2006 to the vegetation cover on different geomorphological units of the central Kaukausib catchment, southern Namib Desert (Namibia)

Arid

DOI	10.1127/zfg_suppl/2019/0552
	Impacts of extreme rainfalls in the year 2006 to the vegetation cover on different geomorphological units of the central Kaukausib catchment, southern Namib Desert (Namibia)
	Henselowsky, Felix 1; Pflueger, Ole 2; Bubenzer, Olaf 1
通讯作者	Henselowsky, Felix
来源期刊	ZEITSCHRIFT FUR GEOMORPHOLOGIE
ISSN	0372-8854
出版年	2019
卷号	62 页码:161-181
英文摘要	The dynamic and tempo-spatial development of land cover changes focussing on vegetation development as a result of extraordinary rainfalls in the hyper-arid southern Namib Desert in 2006 is analysed through the use of mid-scale remote sensing satellite imagery (Landsat 5) and the derivation of two vegetation indexes (NDVI & MSAVI2). Interpretation is supported by the analysis of morphometric parameters of the landscape derived from a Digital Elevation Model (Aster GDEM v2). Archived climate weather maps provide meteorological information of the synoptic situation of the atmosphere, forcing strong rainfalls in the southern Namib Desert between April 16 to 22, 2006. The results show, that rainfall was triggered by an Cut-off-Low from the temperate climate system of southern Africa reaching unusually far north and a Temperate Tropical Trough reaching unusually far south at the same time. Vegetation density vitality has its maximum three months after the strong rainfall, where in some regions of the study area a rather dense cover of annual and ephemeral grass occurred. In addition to intense changes in vegetation cover, the Anib and Arasab pans as part of the Kaukausib catchment were flooded for several months. The tripartite approach integrating meteorological, morphometric and biological aspects allows us to use this case study as one of the very rare opportunities to study regional scale vegetation changes in a hyper-arid area by the use of remote sensing techniques. Evidences for a recurrence of this phenomenon during the last 30 years in this region based on the study of archived data show that they have an interval between 5-11 years. Although the region gets mean annual average precipitation of less than 50 mm, it shows that these strong rainfalls are a common feature and might have a high significance for the regional and over-regional ecosystems. The understanding of this is very important, as the southwestern part of Namibia marks the critical boundary zone of sub-tropical to temperate frontal zones and is therefore a highly sensitive region with regard to climate changes and past circulation patterns, but also to predict future situations.
英文关键词	southern Namib Desert extreme rainfall NDVI remote sensing geomorphology
类型	Article
语种	英语
国家	Germany
收录类别	SCI-E
WOS记录号	WOS:000476620100008
WOS关键词	DYNAMICS ; PATTERNS ; AFRICA ; FOG
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219353
作者单位	1.Heidelberg Univ, HCE, Inst Geog, Neuenheimer Feld 348, D-69120 Heidelberg, Germany; 2.Univ Cologne, Inst Geog, Albertus Magnus Pl, D-50923 Cologne, Germany
推荐引用方式 GB/T 7714	Henselowsky, Felix,Pflueger, Ole,Bubenzer, Olaf. Impacts of extreme rainfalls in the year 2006 to the vegetation cover on different geomorphological units of the central Kaukausib catchment, southern Namib Desert (Namibia)[J],2019,62:161-181.
APA	Henselowsky, Felix,Pflueger, Ole,&Bubenzer, Olaf.(2019).Impacts of extreme rainfalls in the year 2006 to the vegetation cover on different geomorphological units of the central Kaukausib catchment, southern Namib Desert (Namibia).ZEITSCHRIFT FUR GEOMORPHOLOGIE,62,161-181.
MLA	Henselowsky, Felix,et al."Impacts of extreme rainfalls in the year 2006 to the vegetation cover on different geomorphological units of the central Kaukausib catchment, southern Namib Desert (Namibia)".ZEITSCHRIFT FUR GEOMORPHOLOGIE 62(2019):161-181.