Vulnerability of groundwater resources to interaction with river water in a boreal catchment

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http://hdl.handle.net/10138/161975

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Rautio , A , Kivimäki , A-L , Korkka-Niemi , K , Nygård , M , Salonen , V-P , Lahti , K & Vahtera , H 2015 , ' Vulnerability of groundwater resources to interaction with river water in a boreal catchment ' , Hydrology and Earth System Sciences , vol. 19 , no. 7 , pp. 3015-3032 . https://doi.org/10.5194/hess-19-3015-2015

Title: Vulnerability of groundwater resources to interaction with river water in a boreal catchment
Author: Rautio, A.; Kivimäki, A.-L.; Korkka-Niemi, K.; Nygård, M.; Salonen, V.-P.; Lahti, K.; Vahtera, H.
Contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Water Protect Assoc River Vantaa & Helsinki Reg
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
Date: 2015-07
Language: eng
Number of pages: 18
Belongs to series: Hydrology and Earth System Sciences
ISSN: 1027-5606
URI: http://hdl.handle.net/10138/161975
Abstract: A low-altitude aerial infrared (AIR) survey was conducted to identify hydraulic connections between aquifers and rivers and to map spatial surface temperature patterns along boreal rivers. In addition, the stable isotopic compositions (delta O-18, delta D), dissolved silica (DSi) concentrations and electrical conductivity of water in combination with AIR data were used as tracers to verify the observed groundwater discharge into the river system in a boreal catchment. Based on low temperature anomalies in the AIR survey, around 370 groundwater discharge sites were located along the main river channel and its tributaries (203 km altogether). On the basis of the AIR survey, the longitudinal temperature patterns of the studied rivers differed noticeably. The stable isotopes and DSi composition revealed major differences between the studied rivers. The groundwater discharge locations identified in the proximity of 12 municipal water intake plants during the low-flow seasons should be considered as potential risk areas for water intake plants during flood periods (groundwater quality deterioration due to bank infiltration), and should be taken under consideration in river basin management under changing climatic situations.
Subject: THERMAL INFRARED IMAGERY
STREAMBED TEMPERATURES
HEADWATER CATCHMENT
DISSOLVED SILICA
ISOTOPE RATIOS
DISCHARGE
PRECIPITATION
FLOW
LAKE
PERSPECTIVE
1171 Geosciences
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