TY - JOUR
T1 - Hydrological Spaces of Long-Term Catchment Water Balance
AU - Daly, Edoardo
AU - Calabrese, Salvatore
AU - Yin, Jun
AU - Porporato, Amilcare
N1 - Funding Information:
E. D. thankfully acknowledges the support of the Australian Research Council and the Victoria Department of Economic Development, Jobs, Transport and Resources through the Project LP140100871. J. Y. acknowledges support from the National Natural Science Foundation of China (Grant 51739009). A. P. acknowledges support from the U.S. National Science Foundation (NSF) Grants EAR‐1331846 and EAR‐1338694 and BP through the Carbon Mitigation Initiative (CMI) at Princeton University. The Authors thank H. Gao for providing the data of average slopes of the catchments within MOPEX and three anonymous reviewers for helpful suggestions. The data used in the figures are available in the supporting information and were calculated from the original data ( ftp://hydrology.nws.noaa.gov/pub/gcip/mopex/US_Data/ ).
Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Land and water management often relies upon relationships describing the catchment-scale water balance using only a few parameters. The classic Budyko and Turc frameworks are examples of these relationships applicable to large catchments, where the effect of climatic variables on the water balance overshadows that of catchment characteristics, including the catchment ability to store water to supply evapotranspiration. To account for the latter in the list of variables driving evapotranspiration, here we introduce a new framework that includes Budyko and Turc as particular cases. The four variables in this framework are combined to form dimensionless groups, the choice of which leads to the definition of hydrological spaces highlighting different features of the long-term hydrological partitioning. In addition to the Budyko and Turc spaces, suitable for water- and energy-limited catchments, respectively, a new space ensues; this is especially apt to describe catchments where evapotranspiration is mainly controlled by catchment characteristics. An existing stochastic model for the soil water balance is used to specify the relationship between the variables in these different hydrological spaces. This framework, successfully tested here against about 400 catchments in the continental United States, provides a concise yet realistic description of long-term catchment-scale water balance and overcomes some limitations of current models for the estimation of long-term evapotranspiration and runoff in ungauged catchments.
AB - Land and water management often relies upon relationships describing the catchment-scale water balance using only a few parameters. The classic Budyko and Turc frameworks are examples of these relationships applicable to large catchments, where the effect of climatic variables on the water balance overshadows that of catchment characteristics, including the catchment ability to store water to supply evapotranspiration. To account for the latter in the list of variables driving evapotranspiration, here we introduce a new framework that includes Budyko and Turc as particular cases. The four variables in this framework are combined to form dimensionless groups, the choice of which leads to the definition of hydrological spaces highlighting different features of the long-term hydrological partitioning. In addition to the Budyko and Turc spaces, suitable for water- and energy-limited catchments, respectively, a new space ensues; this is especially apt to describe catchments where evapotranspiration is mainly controlled by catchment characteristics. An existing stochastic model for the soil water balance is used to specify the relationship between the variables in these different hydrological spaces. This framework, successfully tested here against about 400 catchments in the continental United States, provides a concise yet realistic description of long-term catchment-scale water balance and overcomes some limitations of current models for the estimation of long-term evapotranspiration and runoff in ungauged catchments.
KW - Budyko framework
KW - Turc framework
KW - catchment water balance
KW - evapotranspiration
KW - land use
KW - precipitation
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U2 - 10.1029/2019WR025952
DO - 10.1029/2019WR025952
M3 - Article
AN - SCOPUS:85076347411
SN - 0043-1397
VL - 55
SP - 10747
EP - 10764
JO - Water Resources Research
JF - Water Resources Research
IS - 12
ER -