Explaining spatial variability in mean annual runoff in the conterminous United States

The hydrologic concepts needed in a water-balance model to estimate the spatial varia- tion in mean annual runoff for the 344 climate divisions in the conterminous United States (U.S.) were determined. The concepts that were evaluated were the climatic supply of water (precipitation), cli- matic demand for water (potential evapotranspiration), seasonality in supply and demand, and soil- moisture-storage capacity. Most (91%) of the spatial variability in mean annual runoff for the climate divisions in the conterminous U.S. was explained by the spatial variability of mean annual precipitation minus mean annual potential evapotranspiration. When soil-moisture-storage capacity and seasonality in supply and demand were added to the water balance, the explained variance in mean annual runoff increased slightly, and the error in estimated mean annual runoff decreased significantly. Adding soil- moisture-storage capacity and seasonality in supply and demand provided the most improvement in areas where seasonal supply and demand are out of phase.

[1]  W. Krug,et al.  Average Annual Runoff in the United States, 1951-80 , 1985 .

[2]  Claude N. Williams,et al.  A Model to Estimate the Time of Observation Bias Associated with Monthly Mean Maximum, Minimum and Mean Temperatures for the United States , 1986 .

[3]  Z. Osmolski.  Estimating Potential Evapotranspiration in Arid Environments , 1981 .

[4]  Walter J. Rawls,et al.  Predicting runoff from Rangeland Catchments: A comparison of two models , 1990 .

[5]  Thomas R. Karl,et al.  The Identification of 10- to 20-Year Temperature and Precipitation Fluctuations in the Contiguous United States , 1984 .

[6]  M. Wigmosta,et al.  An adaptive modeling and monitoring approach to describe the hydrologic behavior of small catchments , 1997 .

[7]  P. Burrough.  Principles of Geographical Information Systems for Land Resources Assessment , 1986 .

[8]  David Yates,et al.  CLIMATE CHANGE IMPACTS ON THE HYDROLOGIC RESOURCES OF EUROPE: A SIMPLIFIED CONTINENTAL SCALE ANALYSIS , 1997 .

[9]  W. Langbein,et al.  Annual runoff in the United States , 1949 .

[10]  Peter S. Eagleson,et al.  Effects of spatial variability on annual average water balance , 1987 .

[11]  P. Milly.  Climate, soil water storage, and the average annual water balance , 1994 .

[12]  Jun Xia,et al.  A non-linear perturbation model considering catchment wetness and its application in river flow forecasting , 1997 .

[13]  J. Nash,et al.  River flow forecasting through conceptual models part I — A discussion of principles☆ , 1970 .

[14]  C. W. Thornthwaite.  An approach toward a rational classification of climate. , 1948 .

[15]  Cort J. Willmott,et al.  On the Evaluation of Model Performance in Physical Geography , 1984 .

[16]  Bart Nijssen,et al.  Eegional scale hydrology: I. Formulation of the VIC-2L model coupled to a routing model , 1998 .

[17]  J. R. Wallis,et al.  Hydro-Climatological Trends in the Continental United States, 1948-88 , 1994 .

[18]  G. Russell,et al.  Global river runoff calculated from a global atmospheric general circulation model. , 1990 .

[19]  M. Budyko,et al.  Climate and life , 1975 .