This project uses an adaptation of an old tool, the Lee-type manual seepage meter (Lee, 1977), with a state-of-the-art electromagnetic flow meter that enables rapid, autonomous, bi-directional measurements of fluid exchange rates across the sediment/water interface (Rosenberry and Morin, 2004). When such measurements are coupled and interpreted with surface and groundwater pressure, salinity and temperature data, as well as other complementary measurements such as excess watercolumn 222Rn activities, then realistic groundwater/surface-water exchange rates can be obtained in dynamic coastal environments (Swarzenski et al., 2004).
Webb, K. L.; Porter, J. W.
The full article is available via journal subscription or single article purchase. The abstract may be viewed on the Science Direct website.
Bokuniewicz, H.; Huettel, M.; Moore, W. S. ; Taniguchi, M.
The full article is available only via journal subscription or single article purchase. The abstract may be viewed on the SpringerLink website.
Nuzzi, R.,; Waters, R.; Wyman, K.; Falkowski, P. G.; Wallace, D. W. R.
The full article is available via journal subscription or single article purchase. The abstract may be viewed on the Wiley Interscience website by selecting the volume and issue number.
Morin, R. H.
Herbold, C,; Charette, M.
Reich, C. D.; Spechler, R. M.; Kindinger, J. L.; Moore, W. S.
The full article is available via journal subscription or single article purchase. The abstract may be viewed on the Science Direct website by selecting the volume and issue number.
Burrnett, B.; Reich, C. D.; Dulaiova, H.; Peterson, R.; Meunier, J.
Costa, J.; foreman, K.; Teal, J. M.; Howes, B. L.; Aubrey, D. G.
Gaines, A. G.
Our two electromagnetic seepmeter prototypes are now complete and have been undergoing bench tests in the St. Petersburg, FL office. One of the hurdles we are currently overcoming is being able to provide enough portable electricity to power the computers and meters at the remote site in ENP. Our Rad-7 Aqua is now operational and will be able to continuously provide very precise 222Rn measurements to supplement our seepmeter data.
We will be in the field with these EM seepmeters starting August 19th with Drs Langevin and Charette and others. WHOI will join us in the fieldwork for intercalibration studies of our seepage meters. One successful field trip has been completed this year to collect interstitial waters for Ra isotopic measurements. A diffusive-advective flux estimate of GW-SW exchange can be derived from these profiles.
Field work is scheduled for the week of Aug 19th. From this field trip we plan to provide a 7-day time series of bi-directional flux across the sediment-water interface. Data from two very different seepage meter prototypes will be assessed along with the longer termed assessment of the bidirectional flux across the sediment-water interface at select TIME sites. Time series metals/nutrient profiles should provide an estimate of the role of GW-SW exchange processes.
Any use of trade, product, or firm names is for descriptive purposes only and does not constitute endorsement by the U.S. Government
To contrast the Bottle Creek site, we also deployed our EM seepage meter at one site in Sarasota Bay, Florida (June, 2004), where groundwater/surface-water exchange rates are expected to be much enhanced by physical and hydrogeologic characteristics unique to these coastal waters. At this site, during the seepage meter deployment, water levels fluctuated by about 80 cm and correlated reasonably well.
U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather
Henkel - Webmaster
Generated by mp version 2.8.18 on Mon Apr 26 12:16:55 2010