Paper No. 59-1
Presentation Time: 1:35 PM
HOW DO HYDROLOGIC FORCING AND GEOLOGIC SETTING CONTROL RIVER CORRIDOR EXCHANGE IN A 5TH ORDER MOUNTAIN STREAM NETWORK?
WARD, Adam S.1, HERZOG, Skuyler1, WONDZELL, Steven M.2, SCHMADEL, Noah3, BLAEN, Phillip4, DRUMMOND, J.5, HANNAH, David M.6, HARMAN, Ciaran J.7, KNAPP, Julia8, KRAUSE, Stefan6, KURZ, Marie J.9, LI, Angang10, MARTI, Eugenia11, MILLER, Melinda1, MILNER, Alexander6, NEIL, Kerry1, PLONT, Stephen12, ROCHE, Kevin13, PACKMAN, A.I.5, WISNOSKI, Nathan14 and ZARNETSKE, Jay15, (1)School of Public and Environmental Affairs, Indiana University, Bloomington, IN 47405, (2)Pacific Northwest Research Station, U.S. Forest Service, 3625 93rd SW, Olympia, WA 98512, (3)U.S. Geological Survey, National Center, Reston, VA 20192, (4)University of Birmingham, Birmingham, United Kingdom, (5)Northwestern University, Evanston, IL 60208, (6)Geography, Earth and Environmental Science Department, University of Birmingham, Birmingham, B15 2TT, United Kingdom, (7)Department of Environmental Health and Engineering, Johns Hopkins University, 3400 N Charles Street, Baltimore, MD 21218, (8)University of Tuebingen, Center for Applied Geoscience, Tuebingen, D-72074, Germany, (9)Academy of Natural Sciences of Drexel University, Patrick Center for Environmental Research, 1900 Benjamin Franklin Parkway, Philadelphia, PA 19103, (10)Northwestern University, 2145 Sheridan Road, Tech A314, Evanston, IL 60208-3109, (11)CEAB-CSIC, Girona, Spain, (12)Department of Biological Sciences, Virginia Tech, Blacksburg, VA 24061, (13)Notre Dame University, South Bend, IN, (14)Biology, Indiana University, Bloomington, IN 47405, (15)Deptartment of Earth and Environmental Sciences, Michigan State University, East Lansing, MI 48824
It is recognized that exchange of water, energy, and solutes between streams and their valley bottoms are controlled by hydrologic forcing interacting with the local geomorphic setting. Despite a host of field studies conducted at the reach scale, we have little predictive power at the scale of river networks. For example, discharge has been reported to increase, decrease, and have no impact on river corridor exchange based on stream solute tracer studies. It is logical to represent hydrologic forcing based on discharge, which reflects storm and seasonal responses. Similarly, remotely sensed characteristics of geologic setting (e.g., river corridor slope, sinuosity) are a promising basis for explaining river corridor exchange along networks. However, the spatiotemporal relationships linking discharge to geologic setting remain unknown. In this study, we endeavor to predict river corridor exchange as a function of (1) discharge variation at a fixed location; (2) discharge variation as a function of drainage area during a fixed baseflow condition; and (3) local geomorphic setting. To achieve these predictions, we present more than 60 solute tracer studies conducted in the 5th order basin of the H.J. Andrews Experimental Forest (Oregon, USA).
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