ACKNOWLEDGMENTS:
This research was supported by the U.S. Department of Energy, Office of
Science, Office of Biological and Environmental Research, Environmental
System Science (ESS) Program. This contribution originates from the
River Corridor Scientific Focus Area (SFA) project at Pacific Northwest
National Laboratory (PNNL). Pacific Northwest National Laboratory is
operated by Battelle Memorial Institute for the U. S. Department of
Energy under Contract DE-AC05-76RL01830.