DOI: 10.5194/hess-19-3541-2015
Scopus记录号: 2-s2.0-84939234632
论文题名: Impacts of beaver dams on hydrologic and temperature regimes in a mountain stream
作者: Majerova M ; , Neilson B ; T ; , Schmadel N ; M ; , Wheaton J ; M ; , Snow C ; J
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 8 起始页码: 3541
结束页码: 3556
语种: 英语
Scopus关键词: Ecosystems
; Groundwater
; Groundwater resources
; Rivers
; Surface waters
; Discharge observations
; Ground water-surface water interactions
; Groundwater elevations
; Hydrologic process
; Spatial and temporal scale
; Stream temperatures
; Temperature regimes
; Thermal heterogeneity
; Dams
; colonization
; dam
; discharge
; groundwater-surface water interaction
; hydrological regime
; mountain stream
; residence time
; riparian zone
; temperature gradient
; tracer
; United States
; Utah
英文摘要: Beaver dams affect hydrologic processes, channel complexity, and stream temperature in part by inundating riparian areas, influencing groundwater-surface water interactions, and changing fluvial processes within stream systems. We explored the impacts of beaver dams on hydrologic and temperature regimes at different spatial and temporal scales within a mountain stream in northern Utah over a 3-year period spanning pre- and post-beaver colonization. Using continuous stream discharge, stream temperature, synoptic tracer experiments, and groundwater elevation measurements, we documented pre-beaver conditions in the first year of the study. In the second year, we captured the initial effects of three beaver dams, while the third year included the effects of ten dams. After beaver colonization, reach-scale (∼ 750 m in length) discharge observations showed a shift from slightly losing to gaining. However, at the smaller sub-reach scale (ranging from 56 to 185 m in length), the discharge gains and losses increased in variability due to more complex flow pathways with beaver dams forcing overland flow, increasing surface and subsurface storage, and increasing groundwater elevations. At the reach scale, temperatures were found to increase by 0.38 °C (3.8 %), which in part is explained by a 230 % increase in mean reach residence time. At the smallest, beaver dam scale (including upstream ponded area, beaver dam structure, and immediate downstream section), there were notable increases in the thermal heterogeneity where warmer and cooler niches were created. Through the quantification of hydrologic and thermal changes at different spatial and temporal scales, we document increased variability during post-beaver colonization and highlight the need to understand the impacts of beaver dams on stream ecosystems and their potential role in stream restoration. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78446
Appears in Collections: 气候变化事实与影响
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作者单位: Utah Water Research Laboratory, Department of Civil and Environmental Engineering, Utah State University, 8200 Old Main Hill, Logan, UT, United States; Department of Watershed Sciences, Utah State University, 8200 Old Main Hill, Logan, UT, United States
Recommended Citation:
Majerova M,, Neilson B,T,et al. Impacts of beaver dams on hydrologic and temperature regimes in a mountain stream[J]. Hydrology and Earth System Sciences,2015-01-01,19(8)