Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.2475/08.2014.02 |
STRATH DEVELOPMENT IN SMALL ARID WATERSHEDS: CASE STUDY OF SOUTH MOUNTAIN, SONORAN DESERT, ARIZONA | |
Larson, Phillip H.1; Dorn, Ronald I.2 | |
通讯作者 | Larson, Phillip H. |
来源期刊 | AMERICAN JOURNAL OF SCIENCE
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ISSN | 0002-9599 |
EISSN | 1945-452X |
出版年 | 2014 |
卷号 | 314期号:8页码:1202-1223 |
英文摘要 | Analyses of ephemeral granitic drainages of <5 km(2) at South Mountain metamorphic core complex, central Arizona, reveal a previously undocumented process of bedrock strath formation in this setting. Granitic channel banks experience a higher degree of mineral decay than that of granitic channel floors. Electron microscope observations show that grussification along the granitic channel banks occurs through abiotic processes of biotite oxidation and biotic processes associated with mycorrhizal fungi and roots of plants preferentially growing along channel banks. Digital image processing of backscattered electron microscope (BSE) images measured: (a) an enhancement of porosity along channel banks 2x to 5x greater than mid-channel positions; and (b) the gradual separation of grains over a 13-year period caused by the roots of Paloverde (Parkinsonia microphylla) trees. Ongoing mineral decay along banks facilitates differential erosion similar to Montgomery’s (2004) hypothesis. Ephemeral washes migrate laterally into the decayed granite of their banks and erode the distal end of bounding pediments, expanding beveled bedrock straths. Direct observations of strath widening in six drainages during three distinct flash floods reveal a range from 4 to 23 millimeters of lateral bank erosion and <1 mm of channel bed abrasion. The widening of straths is likely limited by long-term rates of in situ physical separation of granitic minerals. |
英文关键词 | Strath strath terrace pediment ephemeral stream desert geomorphology |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000345105500002 |
WOS关键词 | METAMORPHIC CORE COMPLEXES ; LONGITUDINAL-PROFILE DEVELOPMENT ; TERRACE FORMATION ; RIVER TERRACES ; MOJAVE DESERT ; METROPOLITAN PHOENIX ; CHANNEL MORPHOLOGY ; FLUVIAL INCISION ; STREAM INCISION ; CLIMATE-CHANGE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
来源机构 | Arizona State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/180593 |
作者单位 | 1.Minnesota State Univ, Dept Geog, Mankato, MN 56001 USA; 2.Arizona State Univ, Sch Geog Sci & Urban Planning, Tempe, AZ 85287 USA |
推荐引用方式 GB/T 7714 | Larson, Phillip H.,Dorn, Ronald I.. STRATH DEVELOPMENT IN SMALL ARID WATERSHEDS: CASE STUDY OF SOUTH MOUNTAIN, SONORAN DESERT, ARIZONA[J]. Arizona State University,2014,314(8):1202-1223. |
APA | Larson, Phillip H.,&Dorn, Ronald I..(2014).STRATH DEVELOPMENT IN SMALL ARID WATERSHEDS: CASE STUDY OF SOUTH MOUNTAIN, SONORAN DESERT, ARIZONA.AMERICAN JOURNAL OF SCIENCE,314(8),1202-1223. |
MLA | Larson, Phillip H.,et al."STRATH DEVELOPMENT IN SMALL ARID WATERSHEDS: CASE STUDY OF SOUTH MOUNTAIN, SONORAN DESERT, ARIZONA".AMERICAN JOURNAL OF SCIENCE 314.8(2014):1202-1223. |
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