Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 3, Pages 1158-1165Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL067082
Keywords
interbasin groundwater flow; watershed hydrology; environmental tracers; geochemistry; residence time; springs
Categories
Funding
- New Mexico EPSCoR (NSF) [EAR-0814449]
- NSF [EAR-1015100, CNH-1010516]
- Purdue University
- Directorate For Geosciences
- Division Of Earth Sciences [1560658] Funding Source: National Science Foundation
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [1010516] Funding Source: National Science Foundation
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Interbasin groundwater flow (IGF) can play a significant role in the generation and geochemical evolution of streamflow. However, it is exceedingly difficult to identify IGF and to determine the location and quantity of water that is exchanged between watersheds. How does IGF affect landscape/watershed geomorphic evolution? Can geomorphic metrics be used to identify the presence of IGF? We examine these questions in two adjacent sedimentary watersheds in northern New Mexico using a combination of geomorphic/landscape metrics, springflow residence times, and spatial geochemical patterns. IGF is expressed geomorphically in the landscape placement of springs and flow direction and shape of stream channels. Springs emerge preferentially on one side of stream valleys where landscape incision has intercepted IGF flow paths. Stream channels grow toward the IGF source and show little bifurcation. In addition, radiocarbon residence times of springs decrease and the geochemical composition of springs changes as the connection to IGF is lost.
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