干旱区生态环境知识资源中心(Arid): The internal structure of spring mounds of Nefzaoua oasis in Tunisia: Formation of an original geomorphic structure

Arid

DOI	10.1002/esp.5734
	The internal structure of spring mounds of Nefzaoua oasis in Tunisia: Formation of an original geomorphic structure
	Raddadi, Afef; Podwojewski, Pascal
通讯作者	Podwojewski, P
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2024
卷号	49 期号:2 页码:901-917
英文摘要	Spring mounds are specific geomorphological landforms in arid or semi-arid environments associated with playas and artesian springs. Spring mounds are found worldwide, especially in the great Artesian Basin of Australia and in North American and Egyptian deserts. They result from an exceptional succession of climatic, geomorphological and hydrogeological conditions, with processes that follow each other in a specific order. In Tunisia, in the arid zone, ca. 126 spring mounds have been identified in Nefzaoua province alone, especially in the oasis east of Chott el Jerid. They have a conical shape that ranges from 200 to more than 2000 m in diameter and 3-30 m tall, and their centre is hollowed out by an artesian spring of fresh water. Palm groves (Phoenix dactylifera) spread out at the foot of each mound. The springs have dried up because of the proliferation of borehole wells. Because of the low electric conductivity (EC) of the sediments (<1 mS cm-1) at their base, spring mounds have been excavated and used as a soil amendment to expand new palm plantations. This excavation allows for analysis of their internal structure, which has never been observed well. In the present study, fine analysis of sediment layers in four sections of two representative mounds showed that vegetation had trapped sediment at their base. Fine strata of variable texture alternating with variable calcium carbonate, gypsum or organic carbon contents suggest a clear limnic origin. Many redoximorphic features, sometimes associated with the presence of old roots, suggest variation in the water level in the centre of the mound. The mounds are capped by a thick layer of indurated gypsum, which helps them resist hydric and aeolian erosion. The origin of the sediment components is discussed.
英文关键词	anthropic degradation geomorphic structure oases spring mound Tunisia
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001098545400001
WOS关键词	GREAT ARTESIAN BASIN ; SOUTHERN TUNISIA ; GYPSUM CRUSTS ; REGION ; VEGETATION ; HISTORY ; AQUIFER ; DESERT ; OASES ; SCALE
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/2XILL650/403316
推荐引用方式 GB/T 7714	Raddadi, Afef,Podwojewski, Pascal. The internal structure of spring mounds of Nefzaoua oasis in Tunisia: Formation of an original geomorphic structure[J],2024,49(2):901-917.
APA	Raddadi, Afef,&Podwojewski, Pascal.(2024).The internal structure of spring mounds of Nefzaoua oasis in Tunisia: Formation of an original geomorphic structure.EARTH SURFACE PROCESSES AND LANDFORMS,49(2),901-917.
MLA	Raddadi, Afef,et al."The internal structure of spring mounds of Nefzaoua oasis in Tunisia: Formation of an original geomorphic structure".EARTH SURFACE PROCESSES AND LANDFORMS 49.2(2024):901-917.