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GSA Field Trip and Session
From: Katharine Cashman cashman@xxxxxxxxxxx
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NTERDISCIPLINARY FIELD TRIP, PARDEE SYMPOSIUM AND TOPICAL SESSION AT GSA:
VOLCANOES, RIVERS, AND GROUNDWATER
This year’s national meeting of the Geological Society of
America will be held in Portland Oregon on October 18-21, 2009. In keeping with the meeting’s theme of
“From Volcanoes to Vineyards”, we are organizing a number of special sessions
and field trips that are at the cusp between geomorphology, volcanology, and
hydrology. The abstract deadline
is August 11 and can be accessed at:
http://www.geosociety.org/meetings/2009/
. Events include:
1) Pre-meeting field trip (Oct 15-17): Fire and Water: Volcanology,
geomorphology, and hydrogeology of the Cascade Range, central Oregon. Trip organizers: Gordon Grant (US Forest Service/Oregon
State University), Kathy Cashman and Natalia Deligne (University of Oregon),
Marshall Gannett (USGS), and Anne Jefferson (UNC-Charlotte).
Description:
This trip will explore the interactions among the
geology, volcanic history, hydrology, and fluvial geomorphology of the central
Cascade Range in Oregon. This region offers an unparalleled opportunity to
examine over 30 million years of landscape evolution in a young volcanic arc
amidst spectacular natural scenery. Key topics to be examined include geologic
control of hydrologic regimes on both the wet and dry side of the Cascade
crest, groundwater dynamics and interaction between surface and groundwater in
volcanic arcs, changing evolution of volcanic styles and products from the
Miocene to the Holocene, and interactions between rivers and lava flows. We
will also consider the history of and controls on channel incision. Along the
way we will trace the Willamette River back to its source high in the Cascades
and then follow the Deschutes River from its source downstream.
2) Pardee
Keynote Symposim (P8). The Evolution of Basaltic Landscapes: Time and the River
and Lava Flowing: Convenors:
Gordon E. Grant, USDA Forest Service, Corvallis, Ore.; Katharine Cashman,
University of Oregon, Eugene, Ore.; Oliver A. Chadwick, University of
California, Santa Barbara, Calif.
Sun., 18 Oct., 8 a.m.–noon
This session will focus on the life and death of basaltic
landscapes around the world, from lava-flow emplacement and dynamics to soil
and hydrologic development, biological colonization, and channel incision and
landscape evolution. Although all
talks are invited only, we are have arranged for poster submissions around this
topic to be included in the poster session for Topical Session T-27 (described
below).
3) Special
Topical Session (T-27):
"Hydrologic Characterization and Simulation of Neogene Volcanic
Terranes". Co-convenors: Marshall Gannett (USGS) and Gordon
Grant (US Forest Service). Sponsor:
GSA Hydrogeology Division. Sunday, Oct. 18 (afternoon):
Description: Young volcanic terranes are commonly areas of
high relief that intercept moisture from moving air masses. The resulting
combination of permeable deposits and high precipitation makes these areas
important sources of streamflow and ground-water recharge. But such terranes
commonly have a high degree of heterogeneity, poorly characterized subsurface
flow and soil properties, extreme hydrologic gradients, and uncertain
hydrologic budgets, providing a particular challenge to researchers working to
understand and model these systems. Hydrologic systems in young volcanic
terranes are critical to many communities and regional economies, and
understanding how such systems are likely to respond to development and changes
in land-use and climate requires development of robust models that couple
climatic, ground- and surface-water, and biologic processes. This session is
intended to bring together researchers from the full range of disciplines
important to understanding, quantifying, and modeling the hydrology of young
volcanic terranes. In particular, researchers working on the atmospheric and
biologic components of the hydrologic cycle are encouraged to submit talks.
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