Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31759.1 |
Contemporary fluvial geomorphology and suspended sediment budget of the partly confined, mixed bedrock-alluvial South River, Virginia, USA | |
Pizzuto, James1; 39;Neal, Michael A.2 | |
2018-11-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130页码:1859-1874 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Trinid & Tobago |
英文摘要 | We developed a conceptual model and suspended sediment budget for a 38 km reach of the fifth-order South River, Virginia, for the past 75 yr. Bedrock, terraces, and alluvial fans confine 64% of the channel's lateral boundaries, while bedrock exposures impose vertical confinement along 37% of the channel. Bedrock exposures in the bed separate pools and riffles developed in gravelly bed material, create unusual kilometer-long pools, and divide the study area into a gently sloping upstream reach and a steeply sloping downstream reach. Bedrock exposures upstream and downstream of an alluvial monitoring site limit changes in bed elevation (documented by scour chains and repeat surveys) by flows with up to 10 yr return periods. Fifty-seven islands (features rarely mentioned in previous studies), mostly created by avulsive floodplain incision, occur in the study reach. Rates of bank retreat, likely moderated by bedrock exposures, have modal values of only a few centimeters per year, while floodplain growth by lateral accretion is negligible. Overbank deposition dominates the sediment budget, but the areal of the extent of the floodplain is currently being reduced by bank erosion and channel widening. The South River stores 2.5% of its annual suspended sediment load per kilometer of downstream transport, demonstrating that suspended sediment storage along partly confined, mixed bedrock-alluvial rivers can be equivalent to storage along fully alluvial rivers. The future evolution of the South River will likely be controlled by bank stabilization designed to control mercury loading into the channel from erosion of contaminated floodplain sediments. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000449028300007 |
WOS关键词 | MID-ATLANTIC REGION ; MEANDERING RIVERS ; FLOODPLAIN DEVELOPMENT ; CENTRAL APPALACHIANS ; CHANNEL MORPHOLOGY ; PIEDMONT STREAMS ; CLIMATE-CHANGE ; DUCK RIVER ; EVOLUTION ; STRATIGRAPHY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25259 |
专题 | 地球科学 |
作者单位 | 1.Univ Delaware, Dept Geol Sci, Newark, DE 19716 USA; 2.18 Farrell Flats,Gordon St, St Augustine, Trinid & Tobago; 3.US Geol Survey, Natl Ctr 430, Reston, VA 20192 USA; 4.2859 Furnace Pl, Doylestown, PA 18902 USA; 5.CH2M Hill Engineers, 1717 Arch St,Suite 4400, Philadelphia, PA 19103 USA; 6.George H Moody Middle Sch, 7800 Woodman Rd, Henrico, VA 23228 USA |
推荐引用方式 GB/T 7714 | Pizzuto, James,39;Neal, Michael A.. Contemporary fluvial geomorphology and suspended sediment budget of the partly confined, mixed bedrock-alluvial South River, Virginia, USA[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:1859-1874. |
APA | Pizzuto, James,&39;Neal, Michael A..(2018).Contemporary fluvial geomorphology and suspended sediment budget of the partly confined, mixed bedrock-alluvial South River, Virginia, USA.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,1859-1874. |
MLA | Pizzuto, James,et al."Contemporary fluvial geomorphology and suspended sediment budget of the partly confined, mixed bedrock-alluvial South River, Virginia, USA".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):1859-1874. |
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