Fluid flow processes at Subduction zones
My research combines field work, laboratory work, and numerical modeling to investigate the interrelationship of fluid flow and deformation in subduction zones. Much of the work has been with the Ocean Drilling Program (ODP) and the Integrated Ocean Drilling Program (IODP), including drilling legs to investigate the Oregon, Barbados, Nankai, and Costa Rica subduction zones.
I am involved in work as part of NanTroSEIZE, which is investigating the formation of earthquakes in the Nankai subduction zone off of Japan. In 2007-2008, I was co-chief on IODP Expedition 316, part of the initial stage of NanTroSEIZE drilling. Shallow sediments tell an important story about the history of faulting, including formation of a "megasplay fault". During 2010-2011, I was onboard IODP Expedition 333, investigating the sediments entering the subduction zone.
During Fall 2012, I will be on IODP Expedition 344 offshore of Costa Rica.
Conduit-Matrix Interactions in the unconfined portion of the upper Floridan Aquifer
We have been working at understanding the interaction between sinking streams, springs, and the upper Floridan aquifer.
At O’leno State Park, the Santa Fe River enters a sinkhole, and re-emerges at the River Rise, ~ 5 km away. Our research has used temperature to trace the underground path of the water and water budgets to estimate the amount of dissolution. More recent work has examined the variations of diffuse recharge and its role in dissolution. Sampling of wells and chemical analyses have helped to distinguish water sources, including finding contributions from deeper within the aquifer system.
We are currently studying how flooding along the Suwannee River affects springs. As water levels in the Suwannee River rise faster than the surrounding water table, river water flows backwards into the springs, affecting water quality and perhaps helping to dissolve the cave systems.
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