Arid
DOI10.1016/j.rse.2016.07.006
Estimating the age of desert alluvial surfaces with spaceborne radar data
Hetz, Guy1,2; Mushkin, Amit1,3; Blumberg, Dan G.2; Baer, Gidon1; Ginat, Hanan4
通讯作者Mushkin, Amit
来源期刊REMOTE SENSING OF ENVIRONMENT
ISSN0034-4257
EISSN1879-0704
出版年2016
卷号184页码:288-301
英文摘要

We present a new dating approach for desert alluvial surfaces that utilizes radar image data to obtain regional scale correlations between dated surfaces and surfaces of unknown ages. The study was carried out along the Arava segment of the Dead Sea Transform north of the Gulf of Elat (Aqaba) using Advanced Land Observation Satellite (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) data with 6-12 m/pixel resolutions. Nineteen independently dated Quaternary morphostratigraphic alluvial units (5 to 1910 ka) from eight different sites with variable lithologies (carbonate/magmatic/chert) were examined in order to develop, test and validate the proposed approach. Expanding on previous studies that established the characteristic smoothing of desert alluvial surface through time and the capability of measuring such roughness variations with radar, we employed a pixel-aggregation approach that yielded a robust (R-2 = 0.95) power-law relation between the average radar bacicscatter value from the surface (’AR’) and the abandonment age (’T’) of the unit as measured with independent methods such as luminescence and/or cosmogenic radionuclide dating. We found that: 1) This AR-T correlation can be inverted to obtain calibrated radar-based T estimates as old as similar to 1.5 Ma with 35% uncertainty; 2) ALOS PALSAR 6 m/pixel images acquired at incidence angles of 34-38 degrees yielded optimal results; 3) a sample of at least 70 contiguous radar pixels was required to capture the natural roughness variability of the surfaces examined, and 4) surface lithology did not exert a primary effect on T inversions. Validation experiments yielded radar-based ages of 3 +/- 1, 91 +/- 32, 484 +/- 169 and 1604 +/- 561 ka that compare to Holocene, 56 +/- 14, 540 60 and 1590 250 ka ages previously determined for the same surfaces, respectively. We propose that with region-specific calibrations, spaceborne radar data can be used to quantitatively estimate the age of abandoned alluvial units across regional scales. (C) 2016 Elsevier Inc. All rights reserved.


类型Article
语种英语
国家Israel ; USA
收录类别SCI-E
WOS记录号WOS:000383827800022
WOS关键词EASTERN MOJAVE DESERT ; DEAD-SEA RIFT ; FAN SURFACES ; PEDOGENIC PROCESSES ; CALIFORNIA ; EVOLUTION ; ROUGHNESS ; PAVEMENTS ; VALLEY ; SOILS
WOS类目Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
来源机构Ben-Gurion University of the Negev
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196007
作者单位1.Geol Survey Israel, Jerusalem, Israel;
2.Ben Gurion Univ Negev, Beer Sheva, Israel;
3.Univ Washington, Seattle, WA 98195 USA;
4.Dead Sea & Arava Sci Ctr, Jerusalem, Israel
推荐引用方式
GB/T 7714
Hetz, Guy,Mushkin, Amit,Blumberg, Dan G.,et al. Estimating the age of desert alluvial surfaces with spaceborne radar data[J]. Ben-Gurion University of the Negev,2016,184:288-301.
APA Hetz, Guy,Mushkin, Amit,Blumberg, Dan G.,Baer, Gidon,&Ginat, Hanan.(2016).Estimating the age of desert alluvial surfaces with spaceborne radar data.REMOTE SENSING OF ENVIRONMENT,184,288-301.
MLA Hetz, Guy,et al."Estimating the age of desert alluvial surfaces with spaceborne radar data".REMOTE SENSING OF ENVIRONMENT 184(2016):288-301.
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