干旱区生态环境知识资源中心(Arid): Spring discharge and thermal regime of a groundwater dependent ecosystem in an arid karst environment

Arid

DOI	10.1016/j.jhydrol.2020.124947
	Spring discharge and thermal regime of a groundwater dependent ecosystem in an arid karst environment
	Caldwell, Todd G.; Wolaver, Brad D.; Bongiovanni, Tara; Pierre, Jon P.; Robertson, Sarah; Abolt, Charles; Scanlon, Bridget R.
通讯作者	Caldwell, TG
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	587
英文摘要	In semi-arid regions, groundwater-dependent ecosystems rely on stable hydro-thermal regimes where refugia have supported aquatic biota for millennia. In karst systems, springs provide consistent flows and stenothermal conditions that buffer extremes. Our objective was to assess the impacts of spring discharge on instream temperatures, using the pristine Devils River in Texas as a case study, where climate change and groundwater development threaten to reduce spring flows and aquatic habitats of protected species (Devils River minnow and Texas hornshell mussel). Instream temperatures and discharge were monitored for three years above and below the Finegan Spring complex. These time series were extended back 30 years using temperature data from North American Land Data Assimilation System (NLDAS) land surface models. Monitoring data revealed that springs contributed similar to 40% of total river discharge. Spring temperatures were consistently 22.6 +/- 0.3 degrees C providing thermal refugia to 200 m of river-cooling the streamflow in summer and warming it in winter, with a noted stratification overturning each winter. High correlations between NLDAS air and soil temperatures and instream temperatures allowed the water temperature record to be extended over 30 years. While air and soil temperatures increased 0.35 degrees C and 0.30 degrees C per decade, spring inputs from karst aquifer buffer downstream temperature increases to 0.12 degrees C per decade. Furthermore, spring discharge reduced the duration of extreme thermal habitat thresholds by 50-70%. A similar approach could be applied to other groundwater dependent ecosystems with sparse temperature data. The results underscore the importance of spring discharge in maintaining heterogeneous aquatic habitats in karst terrain.
英文关键词	Groundwater dependent ecosystems Karst hydrology Springs Refugia Climate change Fisheries
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000568819100080
WOS关键词	STREAM TEMPERATURE ; CLIMATE-CHANGE ; ALASMIDONTA-HETERODON ; HABITAT ASSOCIATIONS ; WATER TEMPERATURE ; DEVILS RIVER ; FLOW ; FISH ; HYDROLOGY ; REFUGIA
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326241
作者单位	[Caldwell, Todd G.; Wolaver, Brad D.; Bongiovanni, Tara; Pierre, Jon P.; Abolt, Charles; Scanlon, Bridget R.] Univ Texas Austin, Bur Econ Geol, Jackson Sch Geosci, Austin, TX USA; [Robertson, Sarah] Texas Parks & Wildlife Dept, San Marcos, TX USA; [Caldwell, Todd G.] US Geol Survey, Nevada Water Sci Ctr, Carson City, NV 89701 USA
推荐引用方式 GB/T 7714	Caldwell, Todd G.,Wolaver, Brad D.,Bongiovanni, Tara,et al. Spring discharge and thermal regime of a groundwater dependent ecosystem in an arid karst environment[J]. United States Geological Survey,2020,587.
APA	Caldwell, Todd G..,Wolaver, Brad D..,Bongiovanni, Tara.,Pierre, Jon P..,Robertson, Sarah.,...&Scanlon, Bridget R..(2020).Spring discharge and thermal regime of a groundwater dependent ecosystem in an arid karst environment.JOURNAL OF HYDROLOGY,587.
MLA	Caldwell, Todd G.,et al."Spring discharge and thermal regime of a groundwater dependent ecosystem in an arid karst environment".JOURNAL OF HYDROLOGY 587(2020).