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DOI	10.1016/j.jhydrol.2021.127029
	The impact of geomorphology on groundwater recharge in a semi-arid mountainous area
	Letz, Or; Siebner, Hagar; Avrahamov, Naama; Egozi, Roey; Eshel, Gil; Dahan, Ofer
通讯作者	Letz, O (corresponding author), Ben Gurion Univ Negev, Zuckerberg Inst Water Res, IL-84990 Sede Boqer, Israel.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	603
英文摘要	The impact of geomorphological structures on rainwater infiltration and groundwater recharge in the mountainous terrain of a semi-arid region was studied in the southern part of the Judean Western Mountain Aquifer (WMA) in Israel and the Palestinian Authority. The study was conducted in two main typical geomorphological landscape units which include exposed rock outcrops on the hillslope, and human-made agricultural soil terraces in a first-order stream channel. We measured rainwater infiltration through the unsaturated zone in the two geomorphological setups using vadose zone monitoring systems (VMS), that enabled continuous tracking of rainwater percolation and tracer transport through the unsaturated zone with respect to the rain patterns. The results from three years of continuous monitoring of water percolation through the unsaturated zone indicated a quick and intense percolation pattern in the rocky terrain compared to that measured in the deep soil of the terrace. The precipitation patterns, as reflected from the rain distribution and intensities, appeared to have a significant impact on deep water percolation and ultimately on groundwater recharge. In the rocky terrain, rain events of high intensity, even during drought years of low cumulative precipitation, resulted in deep water infiltration, which ultimately turned into groundwater recharge. On the other hand, infiltration through deep soils, as prevailed in terraces, valleys, and high plains, was found to be very limited, subjected to intense evaporation and ultimately result by reduced groundwater recharge. It appears that the value of annual cumulative precipitation is of a lower importance to groundwater recharge while high rain intensity is the most dominant factor responsible for deep water infiltration. Tracer migration patterns in the unsaturated zone revealed that precipitation on the rock outcrops promotes the generation of local runoff that rapidly drains into the subsurface through infiltration hot spots. It has been observed that these hot spots are often marked by prickly burnet shrubs (Sarcopoterium spinosum), which thrive year-round on the water abundancy in the soil pockets beneath the impervious rock on land surface. An important outcome of this study is the suggested strong coupling between geomorphological features and groundwater recharge. Application of variable infiltration functions to the different geomorphological characteristics of each terrain may improve groundwater recharge models. Climate changes in recent years, expected to lead to decreased annual precipitations and increased evaporation in parallel with an increase in rainfall intensities in the semi-arid mountainous areas of the eastern Mediterranean. Yet according to our results, the expected increase in rain intensity may actually result in an increase in groundwater recharge.
英文关键词	Infiltration Groundwater recharge Unsaturated zone Geomorphology Semi-arid zone hydrology Terraces migration
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000711024300010
WOS关键词	DEEP VADOSE ZONE ; WATER PERCOLATION ; ROCK AQUIFER ; FLOW ; INFILTRATION ; DYNAMICS ; TRANSPORT ; RAINFALL ; SYSTEM ; FIELD
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374040
作者单位	[Letz, Or; Siebner, Hagar; Dahan, Ofer] Ben Gurion Univ Negev, Zuckerberg Inst Water Res, IL-84990 Sede Boqer, Israel; [Avrahamov, Naama] Eastern R&D Ctr, Sci Pk, IL-40700 Ariel, Israel; [Egozi, Roey; Eshel, Gil] Minist Agr & Rural Dev, Soil Eros Res Stn, IL-50250 Bet Dagan, Israel
推荐引用方式 GB/T 7714	Letz, Or,Siebner, Hagar,Avrahamov, Naama,et al. The impact of geomorphology on groundwater recharge in a semi-arid mountainous area[J],2021,603.
APA	Letz, Or,Siebner, Hagar,Avrahamov, Naama,Egozi, Roey,Eshel, Gil,&Dahan, Ofer.(2021).The impact of geomorphology on groundwater recharge in a semi-arid mountainous area.JOURNAL OF HYDROLOGY,603.
MLA	Letz, Or,et al."The impact of geomorphology on groundwater recharge in a semi-arid mountainous area".JOURNAL OF HYDROLOGY 603(2021).