An Approximate Formula for the Vapor Pressure Deficit Calculation to Estimate the Evaporation in Runoff Formation Models of Russian Rivers

Statistical analysis of daily observation series at 1719 weather stations in Russia in the period from 1966 to 2014 was used to derive an approximate formula for calculating mean daily vapor pressure deficit by the mean daily air temperature and daily precipitation totals. The formula was proposed t...

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Bibliographic Details
Published in:Water resources 2022-12, Vol.49 (6), p.1070-1081
Main Authors: Motovilov, Yu. G., Moreido, V. M., Millionshchikova, T. D.
Format: Article
Language:English
Subjects:
Air temperature
Aquatic Pollution
Atmospheric models
Daily
Daily precipitation
Daily temperatures
Earth and Environmental Science
Earth Sciences
Empirical analysis
Evaporation
Hydrogeology
Hydrologic models
Hydrology
Hydrology/Water Resources
Interaction between Continental Waters and the Environment
Mathematical models
Modelling
Pressure
Regional development
River basins
Rivers
Runoff
Statistical analysis
Statistical methods
Vapor pressure
Vapors
Vapour pressure
Waste Water Technology
Water Management
Water Pollution Control
Watersheds
Weather stations
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Summary:Statistical analysis of daily observation series at 1719 weather stations in Russia in the period from 1966 to 2014 was used to derive an approximate formula for calculating mean daily vapor pressure deficit by the mean daily air temperature and daily precipitation totals. The formula was proposed to reduce the number of meteorological characteristics, required for regional runoff formation models in the estimation of total evaporation, by excluding data on measured vapor pressure deficit, which are more difficult to determine. Testing the proposed formula for problems of hydrological calculations was illustrated by comparing runoff hydrographs over long periods, calculated using two versions of the hydrological model, one with the actual deficit and the other with those calculated by the proposed empirical formula, for a series of regional runoff formation models developed for largest river basins in Russia based on ECOMAG model system. Statistical criteria were used to show that the calculations made with the use of the approximate formula for the majority of compared watersheds yield about the same simulation accuracy as calculations made with the use of actual vapor pressure deficit.
ISSN:0097-8078
1608-344X
DOI:10.1134/S0097807822060094