Patterns in stream longitudinal profiles and implications for hyporheic exchange flow at the H.J. Andrews Experimental Forest, Oregon, USA

• DOI: 10.1002/hyp.5791
• Publication Date: 2005-04-19T11:17:39Z
• Authors: Justin K. Anderson; Steven M. Wondzell; Michael N. Gooseff; Roy Haggerty
• Keywords: Downwelling; Piezometer; Hyporheic Zone

Abstract There is a need to identify measurable characteristics of stream channel morphology that vary predictably throughout networks and influence patterns hyporheic exchange flow in mountain streams. In this paper we characterize longitudinal profiles according unit spacing the concavity water surface profile. We demonstrate that: (1) between zones upwelling downwelling beds streams closely related spacing; (2) magnitude vertical hydraulic gradients (VHGs) driving increase with increasing concavity, measured at specific points along profile; (3) are useful metrics for predicting how amongst headwater mid‐order use regression models describe changes 12 randomly selected reaches spanning 62 km 2 H.J. Andrews Experimental Forest Oregon. Channel increased significantly, whereas average (AWSC) decreased significantly basin area. Piezometer transects installed longitudinally subset were used measure VHG zone, determine location zones. Predictions median pool length distance steps piezometer bracketed separating bed. individual piezometers profile transects. Absolute values VHG, averaged transects, AWSC, indicating potential flow. These findings suggest path lengths increase—and decreases—along continuum from Copyright © 2005 John Wiley & Sons, Ltd.