Previously graduate research assistant at Colorado State University.
Stream nitrate uptake and transient storage over a gradient of geomorphic complexity, north-central Colorado, USA
Article first published online: 18 JAN 2012
Copyright © 2011 John Wiley & Sons, Ltd.
Volume 26, Issue 21, pages 3241–3252, 15 October 2012
How to Cite
Baker, D. W., Bledsoe, B. P. and Price, J. M. (2012), Stream nitrate uptake and transient storage over a gradient of geomorphic complexity, north-central Colorado, USA. Hydrol. Process., 26: 3241–3252. doi: 10.1002/hyp.8385
- Issue published online: 17 SEP 2012
- Article first published online: 18 JAN 2012
- Accepted manuscript online: 2 NOV 2011 10:27PM EST
- Manuscript Accepted: 25 OCT 2011
- Manuscript Received: 11 MAY 2011
- National Science Foundation CAREER Award. Grant Number: (grant no. EAR-0548258)
- transient storage;
- nitrogen spiralling;
- fluvial geomorphology;
- solute transport modelling;
- land use
The understanding of nutrient uptake in streams is impeded by a limited understanding of how geomorphic setting and flow regime interact with biogeochemical processing. This study investigated these interactions as they relate to transient storage and nitrate uptake in small agricultural and urban streams. Sites were selected across a gradient of channel conditions and management modifications and included three 180-m long geomorphically distinct reaches on each of two streams in north-central Colorado. The agricultural stream has been subject to historically variable cattle-grazing practices, and the urban stream exhibits various levels of stabilisation and planform alteration. Reach-scale geomorphic complexity was characterised using highly detailed surveys of channel morphology, substrate, hydraulics and habitat units. Breakthrough-curve modelling of conservative bromide (Br−) and nonconservative nitrate (NO3−) tracer injections characterised transient storage and nitrate uptake along each reach. Longitudinal roughness and flow depth were positively associated with transient storage, which was related to nitrate uptake, thus underscoring the importance of geomorphic influences on stream biogeochemical processes. In addition, changes in geomorphic characteristics due to temporal discharge variation led to complex responses in nitrate uptake. Copyright © 2011 John Wiley & Sons, Ltd.