Abstract
A global integrated water resources model was developed. The model consists of four sub models, a bucket type land surface model, a global river routing model, a process based agricultural model and a reservoir operation model. The model was designed to work with near surface meteorological data and currently available global grid-based digital GIS data. It enable us to conduct 1) monthly or daily assessments of global water supply and demand, 2) numerical experiments concerning the interaction of human activity and land hydrology, 3) analyses on global water balance components in which energy and water balances are perfectly closed. In the former part of this report, the structure of model and the simulation setting are described. In the latter part, the performance and limitation of the model are discussed using the results of a preliminary global simulation.
