Irrigation Water Withdrawls for the World Water Development II
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资源简介：
Gridded field of irrigation withdrawals for 1995 (in km3 per year) at
30 minute (lattitude by longitude) resolution (Vorosmarty et al.,
2005). Country-level irrigation withdrawals per capita (World
Resources Institute, http://earthtrends.wri.org/) were multiplied by
country-level population to estimate irrigation withdrawals for each
country. Country-level irrigation withdrawals were distributed over
irrigated lands (aggregated from Doll and Siebert, 2000) prorated on
estimated irrigation need. Irrigation need was computed as the
difference between potential evapotranspiration (PET, which represents
the crop water requirements under optimal conditions) and actual
evapotranspiration (AET). PET was estimated using the physically-based
function of Shuttleworth and Wallace (1985), which is a modification
of the standard Penman-Monteith PET equation. AET was estimated by the
Water Balance Model (Vorosmarty et al., 1998).
提供机构：
SCIOPS
