National Research Program

Regional Hydrologic Processes

The regional nature of hydrologic processes is generally defined in terms of shared meteorological and basin characteristics. Inferences have been attempted by regressing the parameters of hydrologic interest against these characteristics. Such analyses have not been able to fully explain the variations, extremes or persistence of discharge patterns observed within a geographic area. An accounting of anthropogenic effects on basin characteristics needs to be made. Longer term influences such as decadal to centennial, and millennial climatic fluctuations need to be considered, and the stochastic structure of the hydrologic process itself needs to be studied. The objectives of this project are (1.) to develop secular regional statistics for observed and proxy hydrologic variables, (2.) to use statistical methods to study the influence of climate forcing in such statistics, and identify the effect of long term climatic fluctuations on the nature of hydrologic persistence, and (3) to develop an improved understanding of regional hydrological processes as part of the global hydrologic cycle and its interaction with global climate.

For additional information about the project's collaborative paleoclimatic work see "A Devils Hole Primer".

For information about the HCDN (Hydro-Climatic Data Network), see USGS OFR 92-129.


Landwehr, J.M. and Winograd, I.J., 2012, Devils Hole, Nevada—A Primer: U.S. Geological Survey Fact Sheet 2012–3021, 6 p. (on-line abstract or on-line fact sheet in pdf format, 1.88 MB)

Landwehr, J.M., Meier-Augenstein, W., and Kemp, H.F., 2011, A counter-intuitive approach to calculating non-exchangeable 2H isotopic composition of hair: treating the molar exchange fraction fE as a process-related rather than compound-specific variable: Rapid Communications in Mass Spectrometry, v. 25, no. 2, p. 301–306, DOI: 10.1002/rcm.4854. (on-line abstract of journal article)

Landwehr, J.M., Sharp, W.D., Coplen, T.B., Ludwig, K.R., and Winograd, I.J., 2011, The chronology for the δ18O record from Devils Hole, Nevada, extended into the Mid-Holocene: U.S. Geological Survey Open-File Report 2011-1082, 5 p. (on-line abstract or on line-report in pdf format, 180 KB; see abstract to download data in excel format)

Gellis, A.C., Hupp, C.R., Pavich, M.J., Landwehr, J.M., Banks, W.S.L., Hubbard, B.E., Langland, M.J., Ritchie, J.C., and Reuter, J.M., 2009, Sources, Transport, and Storage of Sediment at Selected Sites in the Chesapeake Bay Watershed, U. S. Geological Survey Scientific Invetigations Report 2008-5186, 110 p. (on-line abstract or on-line report in pdf format, 19.1 MB)

Winograd, I.J., 2009, Political Pressure’s Effect on Repository Sites: Science, v. 326, p. 1480.

Carter, V., Landwehr, J.M., Rybicki, N.B., Reel, J.T., and Ruhl, H.A., 2008, Linkages among submersed aquatic vegetation, nutrients, river discharge and weather in the tidal Potomac River and Estuary, in Buchanan, C., ed., Tidal Potomac River Integrated Analysis: Interstate Commission on the Potomac River Basin. (on-line chapter in pdf format, 1.6 MB)

Coplen, T. B., Neiman, P.J., White, A.B., Landwehr, J.M., Ralph, F.M., and Dettinger, M.D., 2008, Extreme changes in stable hydrogen isotopes and precipitation characteristics in a landfalling Pacific storm: Geophysical Research Letters, v. 35, L21808, doi:10.1029/2008GL035481. (on-line abstract or on-line paper in pdf format, 636 KB, published by American Geophysical Union, not subject to U.S. copyright)

Landwehr, J.M., Reel, J.T., Rybicki, N.R., Ruhl, H.A. and Carter V., 2008, Chesapeake Bay Habitat Criteria Scores and the Distribution of Submersed Aquatic Vegetation in the Tidal Potomac River and Potomac Estuary, 1983-1997 Appendix E, in C. Buchanan, ed., Tidal Potomac River Integrated Analysis (1999), Interstate Commission on the Potomac River Basin, Rockville, Maryland, Electronic Report. (link to report)

Winograd, I.J. and Roseboom Jr., E.H., 2008, Yucca Mountain revisited: Science Magazine, v. 320, p. 1426-1427.

Gellis, A.C., Hupp, C.R., Landwehr, J.M. and Pavich, M.J., 2007, Sources and Transport of Sediment in the Watershed , in Phillips, S.W., ed., Synthesis of U.S. Geological Survey Science for the Chesapeake Bay Ecosystem and Implications for Environmental Management: U. S. Geological Survey Circular 1316, Chapter 6, p. 28-31. (on-line chapter in pdf fomat)

Rybicki, N. B., and Landwehr, J.M., 2007, Long-term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary With exotic macrophytes and improving water quality: Limnology and Oceanography, v. 52, no. 3, p. 1195-1207. (on-line abstract and on-line article in pdf format, 1200 KB - published by the American Society of Limnology and Oceanography with open access)

Rybicki, N.B. and Landwehr, J.M., 2007, Submerged Aquatic Vegetation and Water Clarity, in Phillips, S.W., ed., Synthesis of U.S. Geological Survey Science for the Chesapeake Bay Ecosystem and Implications for Environmental Management: U. S. Geological Survey Circular 1316, Chapter 11, p. 46-49. (on-line chapter in pdf fomat)

Terrestrial Observation Panel for Climate, 2007, Summary Report of  the GCOS/GTOS Terrestrial Observation Panel for Climate, Ninth Session,  28-29 March 2006, Ispara, Italy: GCOS-11 and  GTOS-43 and  WMO/TD No.1371, 26 p. (on-line report in pdf format, 542 KB)

Gellis, A.C. and Landwehr, J.M., 2006, Identifying sources of fine-grained suspended-sediment in the Pocomoke River, an Eastern Shore tributary to the Chesapeake Bay: Proceedings of the Joint Federal Interagency Conference 2006, 8th Federal Interagency Sedimentation Conference, April 2-6, 2006, Reno, NV, Paper 5C-1 in CD_ROM file ISBN 0-9779007-1-1.

Landwehr, J.M. and Coplen, T.B., 2006, Line-conditioned excess: a new method for characterizing stable hydrogen and oxygen isotope ratios in hydrologic systems: Isotopes in Environmental Studies, Aquatic Forum 2004, International Atomic Energy Agency, IAEA-CSP-26, p. 132-135. (on-line paper in pdf format)

Langland, M.J., Raffensperger, J.P., Moyer, D.L., Landwehr, J.M., and Schwarz, G.E., 2006, Changes in Streamflow and Water Quality in Selected Nontidal Basins in the Chesapeake Bay Watershed, 1985-2004: U.S. Geological Survey Scientific Investigations Report 2006-5178, 75 p.and appendices. (on-line report)

Winograd, I. J., Landwehr, J. M., Coplen, T.B., Sharp, W.D., Riggs, A.C., Ludwig, K.R., and Kolesar, P.T., 2006, Devils Hole, Nevada, δ18O Record Extended to the Mid-Holocene: Quaternary Research, v. 66, no. 2, p. 202-212. (on-line abstract of journal article)

Landwehr, J.M., and Coplen, T.B., 2004, The oxygen and hydrogen ratios in waters from the largest river systems of the United States: Isotope Hydrology and Integrated Water Resources Management, IAEA-CSP-23, International Atomic Energy Agency, Vienna, p.402-403.

Revesz, K., and Landwehr, J.M., 2004, Measurement of δ13C and δ18O isotopic ratios of CACO3 by Thermoquest-Finnigan GasBench II and Delta Plus XL continuous flow isotope ratio mass spectrometer with application to Devils Hole Core DH-11 calcite: Isotope Hydrology and Integrated Water Resources Management, IAEA-CSP-23, International Atomic Energy Agency, Vienna, p.485.

Kemp, W.M., Batiuk, R., Bartleson, R., Bergstrom, P., Carter, V., Gallegos, C.L., Hunley, W., Karrh, L., Koch, E., Landwehr, J.M., Moore, K.A., Murray, L., Naylor, M., Rybicki, N.B., Stevenson, J.C., and Wilcox, D., 2004, Habitat requirements for submerged aquatic vegetation in Chesapeake Bay: Water quality, light regime, and physical-chemical factors: Estuaries, v. 27, no. 3, p. 363-377.

Lawford, R.G., Landwehr, J.M., Sorooshian, S., and Whitaker, M.P.L., 2003, International Hydrologic Science Programs and Global Water Issues, in Lawford, R.G., Fort, D., Hartmann, H., and Eden, S., eds., Water: Science, Policy and Management: Water Resources Monograph 16, American Geophysical Union, Washington, D.C., p.223-246.

For additional bibliographic citations by Ike Winograd, also see Interface of Paleoclimatology and Aquifer Geochemistry

Jurate M. Landwehr (professional profile)
U.S. Geological Survey, MS 431 National Center, 12201 Sunrise Valley Drive, Reston, VA 20192
Telephone: 703-648-5893

For information on additional projects in the National Research Program, see Indexes to NRP projects and bibliographies.

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