气候变化领域集成服务门户(CCPortal): Small dams alter thermal regimes of downstream water

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DOI	10.5194/hess-23-4509-2019
	Small dams alter thermal regimes of downstream water
	Chandesris A.; Van Looy K.; Diamond J.S.; Souchon Y.
发表日期	2019
ISSN	1027-5606
起始页码	4509
结束页码	4525
卷号	23 期号:11
英文摘要	The purpose of this study was to quantify the downstream impacts of different types of small dams on summer water temperature in lowland streams.We examined (1) temperature regimes upstream and downstream of dams with different structural characteristics, (2) relationships between stream temperature anomalies and climatic variables, watershed area, dam height, impoundment length and surface area, and residence time, (3) the most significant variables explaining the different thermal behaviors, and (4) the dam thermal effect considering a biological threshold of 22 °C, with a calculation of both the number of days with a temperature above this threshold and the average hourly duration above this threshold. Water temperature loggers were installed upstream and downstream of 11 dams in the Bresse region (France) and monitored at 30 min intervals during summer (June to September) over the 2009 2016 period, resulting in 13 paired water temperature time series (two sites were monitored for two summers, allowing the opportunity to compare cold and hot summers). At 23% of the dams, we observed increased downstream maximum daily temperatures of more than 1 °C; at the remaining dams we observed changes in the maximum daily temperature of -1 to 1 °C. Across sites, the mean downstream increase of the minimum daily temperature was 1 °C, and for 85% of the sites this increase was higher than 0.5 °C. We hierarchically clustered the sites based on three temperature anomaly variables: upstream downstream differences in (1) maximum daily temperature (δTmax), (2) minimum daily temperature (δTmin), and (3) daily temperature amplitude (δTamp). The cluster analysis identified two main types of dam effects on thermal regime: (1) a downstream increase in Tmin associated with Tmax either unchanged or slightly reduced for impoundments of low volume (i.e., a residence time shorter than 0.7 d and a surface area less than 35 000m2), and (2) a downstream increase of both Tmin and Tmax of the same order of magnitude for impoundments of larger volume (i.e., a residence time longer than 0.7 d and a surface area greater than 35 000m2). These downstream temperature increases reached 2.4 °C at certain structures with the potential to impair the structure of aquatic communities and the functioning of the aquatic ecosystem. Overall, we show that small dams can meaningfully alter the thermal regimes of flowing waters, and that these that these effects can be explained with sufficient accuracy (R2 = 0.7) using two simple measurements of small dam physical attributes. This finding may have importance for modelers and managers who desire to understand and restore the fragmented thermalscapes of river networks. © 2019 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	Aquatic ecosystems; Aquatic organisms; Cluster analysis; Dams; Open hearth furnaces; Temperature; Aquatic communities; Biological thresholds; Climatic variables; Significant variables; Stream temperatures; Structural characteristics; Temperature increase; Temperature regimes; Rivers; climate change; cluster analysis; dam; residence time; river system; temperature anomaly; temperature effect; France
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159573
作者单位	Chandesris, A., River Hydro-Ecology Lab, National Research Institute of Science and Technology for Environment and Agriculture, UR Riverly, Lyon, France; Van Looy, K., OVAM, Stationsstraat 110, Mechelen, 2800, Belgium; Diamond, J.S., River Hydro-Ecology Lab, National Research Institute of Science and Technology for Environment and Agriculture, UR Riverly, Lyon, France, Université de Tours, E.A 6293 GéoHydrosytèmes COntinentaux, Parc de Grandmont, Tours, 37200, France; Souchon, Y., River Hydro-Ecology Lab, National Research Institute of Science and Technology for Environment and Agriculture, UR Riverly, Lyon, France
推荐引用方式 GB/T 7714	Chandesris A.,Van Looy K.,Diamond J.S.,et al. Small dams alter thermal regimes of downstream water[J],2019,23(11).
APA	Chandesris A.,Van Looy K.,Diamond J.S.,&Souchon Y..(2019).Small dams alter thermal regimes of downstream water.Hydrology and Earth System Sciences,23(11).
MLA	Chandesris A.,et al."Small dams alter thermal regimes of downstream water".Hydrology and Earth System Sciences 23.11(2019).