干旱区生态环境知识资源中心(Arid): Linking frequency of rainstorms, runoff generation and sediment transport across hyperarid talus-pediment slopes

Arid

DOI	10.1002/esp.4836
	Linking frequency of rainstorms, runoff generation and sediment transport across hyperarid talus-pediment slopes
	Shmilovitz, Yuval 1; Morin, Efrat 1; Rinat, Yair 1; Haviv, Itai 2; Carmi, Genadi 3; Mushkin, Amit 4; Enzel, Yehouda1
通讯作者	Shmilovitz, Yuval
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2020
卷号	45 期号:7 页码:1644-1659
英文摘要	Documenting hillslope response to hydroclimatic forcing is crucial to our understanding of landscape evolution. The evolution of talus-pediment sequences (talus flatirons) in arid areas was often linked to climatic cycles, although the physical processes that may account for such a link remain obscure. Our approach is to integrate field measurements, remote sensing of rainfall and modeling to link between storm frequency, runoff, erosion and sediment transport. We present a quantitative hydrometeorological analysis of rainstorms, their geomorphic impact and their potential role in the evolution of hyperarid talus-pediment slopes in the Negev desert, Israel. Rainstorm properties were defined based on intensity-duration-frequency curves and using a rainfall simulator, artificial rainstorms were executed in the field. Then, the obtained measured experimental results were up-scaled to the entire slope length using a fully distributed hydrological model. In addition, natural storms and their hydro-geomorphic impacts were monitored using X-band radar and time-lapse cameras. These integrated analyses constrain the rainfall threshold for local runoff generation at rain intensity of 14 to 22 mm h(-1) for a duration of five minutes and provide a high-resolution characterization of small-scale runoff-generating rain cells. The current frequency of such runoff-producing rainstorms is similar to 1-3 per year. However, extending this local value into the full extent of hillslope runoff indicates that it occurs only under rainstorms with >= 100-years return interval, or 1% annual exceedance probability. Sheetwash efficiency rises with downslope distance; beyond a threshold distance of similar to 100 m, runoff during rainstorms with such annual exceedance probability are capable of transporting surface clasts. The erosion efficiency of these discrete rare events highlights their potential importance in shaping the landscape of arid regions. Our results support the hypothesis that a shift in the properties and frequency of extreme events can trigger significant geomorphic transitions in areas that remained hyperarid during the entire Quaternary. (c) 2020 John Wiley & Sons, Ltd.
英文关键词	talus-pediment slopes hydrometeorology of arid areas sheetwash convective rain cells hillslope runoff
类型	Article
语种	英语
国家	Israel
收录类别	SCI-E
WOS记录号	WOS:000514745600001
WOS关键词	SOIL-EROSION PROCESSES ; SCARP RETREAT RATES ; RAINFALL SIMULATION ; CONVECTIVE RAINFALL ; PEAK DISCHARGE ; RADAR ; FLATIRONS ; DESERT ; MODEL ; BASIN
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	Ben-Gurion University of the Negev ; Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314320
作者单位	1.Hebrew Univ Jerusalem, Fredy & Nadine Herrmann Inst Earth Sci, Edmond J Safra Campus, IL-9190401 Jerusalem, Israel; 2.Ben Gurion Univ Negev, Dept Geol & Environm Sci, Beer Sheva, Israel; 3.Ben Gurion Univ Negev, Wyler Dept Dryland Agr, Sede Boger CampusIsrael, Beer Sheva, Israel; 4.Geol Survey Israel, Jerusalem, Israel
推荐引用方式 GB/T 7714	Shmilovitz, Yuval,Morin, Efrat,Rinat, Yair,et al. Linking frequency of rainstorms, runoff generation and sediment transport across hyperarid talus-pediment slopes[J]. Ben-Gurion University of the Negev, Hebrew University of Jerusalem,2020,45(7):1644-1659.
APA	Shmilovitz, Yuval.,Morin, Efrat.,Rinat, Yair.,Haviv, Itai.,Carmi, Genadi.,...&Enzel, Yehouda.(2020).Linking frequency of rainstorms, runoff generation and sediment transport across hyperarid talus-pediment slopes.EARTH SURFACE PROCESSES AND LANDFORMS,45(7),1644-1659.
MLA	Shmilovitz, Yuval,et al."Linking frequency of rainstorms, runoff generation and sediment transport across hyperarid talus-pediment slopes".EARTH SURFACE PROCESSES AND LANDFORMS 45.7(2020):1644-1659.