Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Pope, K. O. Articles by Paris, J. F. Search for Related Content GeoRef GeoRef Citation

Spaceborne imaging radar-C (SIR-C) observations of groundwater discharge and wetlands associated with the Chicxulub impact crater, northwestern Yucatan Peninsula, Mexico

¹ Geo Eco Arc Research, 3220 N Street, N.W., Suite 132, Washington, DC 20007, USA
² Division of Environmental Studies, University of California, Davis, California 95616, USA
³ Spatial Information, Visualization, and Analysis Resource Center, California State University at Monterey Bay, Seaside, California 93955, USA

Analyses of spaceborne imaging radar-C (SIR-C) data and field data from the northwestern Yucatan Peninsula, Mexico, demonstrate that spaceborne multifrequency polarimetric radars are excellent tools for characterizing patterns of wetland flooding. Seasonal flooding can be detected in most types of forest and marsh in the radar backscatter magnitude and phase data of both L and C band. Field observations made in the wet and dry seasons concurrent with the space missions and chemical analyses of floodwaters confirm that flooding is the product of discharge from the Yucatan aquifer, which consists of a fresh-water lens floating on seawater. This discharge controls the distribution of wetlands. Therefore, vegetation and flooding patterns, mapped with SIR-C imagery, provide valuable information on the hydrogeology of the region.

Radar-image maps of wetlands and flooding indicate that there are three major zones of groundwater discharge that correlate with structures of the buried Chicxulub crater—zone 1 with the peak ring, zone 2 with the crater rim, and zone 3 with the exterior ring. Zone 1 has sulfate-poor discharge, unlike the sulfate-rich discharge in zones 2 and 3. The highest discharge is in zone 3, where the buried crater is closest to the surface. This groundwater-discharge pattern can be explained by tidal pumping of fresh water to the surface through high permeability zones developed in the Tertiary carbonates overlying crater faults and escarpments.

Key Words: Chicxulub crater • coastal environment • groundwater • radar • remote sensing • wetlands

This article has been cited by other articles:

				R. V. Sweetwood, R. E. Terry, T. Beach, B. H. Dahlin, and D. Hixson The Maya Footprint: Soil Resources of Chunchucmil, Yucatan, Mexico Soil Sci. Soc. Am. J., May 13, 2009; 73(4): 1209 - 1220. [Abstract] [Full Text] [PDF]