Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025014 |
Impacts of Expanding Impervious Surface on Specific Conductance in Urbanizing Streams | |
Baker, M. E.1; Schley, M. L.1; Sexton, J. O.2 | |
2019-08-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:8页码:6482-6498 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Long-term analysis indicates that progressive salinization of freshwaters is widespread. Although increases are often associated with urbanization, knowledge of chemical dynamics during urbanization is limited and typically drawn from space-for-time studies. Thus, the potential role of stream chemistry in sharp biodiversity losses observed at low levels of urbanization is difficult to distinguish from other concurrent factors such as temperature, flow, or sediment. We used a 25-year annual time series of impervious cover for the Baltimore-Washington, DC, metropolitan area to interpret long-term records from 12 watershed-monitoring stations in the Mid-Atlantic Piedmont USA from 1986 to 2010 and explore stream conductivity under progressive urbanization. All 12 watersheds experienced variable but monotonic increases in impervious cover, which ranged from <1% to nearly 25% of contributing area. All monitoring stations exhibited elevated specific conductance relative to background concentrations. Proliferation of impervious cover led to seasonal shifts in monthly conductivity maxima, with progressive dominance of winter pulses and diminishing signal from evapotranspirative concentration in late summer. We found consistently steep increases in stream conductivity across years and seasons associated with incremental increases in low (0-4.5%) levels of watershed impervious cover; moderate to low rates of increase, but distinct seasonal concentrations from 4.5 to 13.8% impervious cover; and increasing predominance of pulses at high levels of impervious cover (>13.8%), particularly when conditioned on winter storm events. Observed patterns may suggest distinct sources and different degrees of hydrologic connection. Despite ubiquitous increases, variability in conductivity trends across space and time underscores the need for more intensive monitoring as urbanization progresses. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490973700008 |
WOS关键词 | LAND-COVER DATABASE ; FRESH-WATER ; ROAD SALT ; MAJOR IONS ; DRAINAGE INFRASTRUCTURE ; COMMUNITY THRESHOLDS ; WAVELET ANALYSIS ; RIVER-BASIN ; URBANIZATION ; CHLORIDE |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/185848 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Maryland Baltimore Cty, Dept Geog & Environm Syst, Baltimore, MD 21228 USA; 2.TerraPulse Inc, Gaithersburg, MD USA |
推荐引用方式 GB/T 7714 | Baker, M. E.,Schley, M. L.,Sexton, J. O.. Impacts of Expanding Impervious Surface on Specific Conductance in Urbanizing Streams[J]. WATER RESOURCES RESEARCH,2019,55(8):6482-6498. |
APA | Baker, M. E.,Schley, M. L.,&Sexton, J. O..(2019).Impacts of Expanding Impervious Surface on Specific Conductance in Urbanizing Streams.WATER RESOURCES RESEARCH,55(8),6482-6498. |
MLA | Baker, M. E.,et al."Impacts of Expanding Impervious Surface on Specific Conductance in Urbanizing Streams".WATER RESOURCES RESEARCH 55.8(2019):6482-6498. |
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