Southward subsurface flow below the Somali Current

Flow stabilization by subsurface phonons.

The interaction between a fluid and a solid surface in relative motion represents a dynamical process that is central to the problem of laminar-to-turbulent transition (and consequent drag increase) for air, sea and land vehicles, as well as long-range pipelines. This problem may in principle be alleviated via a control stimulus designed to impede the generation and growth of instabilities inhe...

A Southward Invasion.

South America and tropical Asia have the most diverse plant life on earth, so it seems intuitive that these regions would supply much of the world’s invasive species. But that’s not the case, according to a new analysis of global plant databases led by Mark van Kleunen of the University of Konstanz in Germany. The data show more nonnative plants originating from temperate Asia and Europe than a...

Anomalous Southward Advection During 2002 in the Northern California Current: Evidence from Lagrangian Surface Drifters

[1] Equatorward velocities in the upwelling jet of the northern California Current were 0.05–0.06 m s 1 faster in spring and summer 2002 than on average over 1998–2002. This result is based on a five-year data set of surface drifters released across the continental margin off central Oregon (44.65 N) during April and July of each year. At this speed, anomalous water displacements of over a degr...

Model-based Control of Subsurface Flow

An emerging method to increase the recovery from oil reservoirs is the application of measurement and control techniques to better control subsurface flow over the life of the reservoir. In particular the use of sensors and remotely controllable valves in wells and at surface, in combination with large-scale subsurface flow models is promising. Various elements from process control may play a r...

Subsurface Flow Constructed Wetlands for Wastewater Treatment