ASSESSMENT OF WATER DEMAND AND SUPPLY BALANCE IN TOKYO BY MODELLING ITS WATER DISTRIBUTION SYSTEM: STUDY ON WATER SUPPLY OF GLOBAL HYDROLOGICAL MODELS

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  • 全球水資源モデルの水供給表現の改良 —配水系統を考慮した東京都の水需給評価—

Abstract

<p> Increasing the spatial resolution of global hydrological models is very challenging. Recent studies have shown the effectiveness of adapting a high-resolution model in a local scale, but without addressing an important issue of global hydrological models, that is water is supplied from the same grid as the water demand over the entire grids. This study addresses the issue by comparing the result of two models: one with explicitly incorporating water distribution system, the other with implicitly expressing water canals, and with and without the assumption of water supply of global hydrological models. The result shows that most of the water could be supplied from different water sources with the assumption of global hydrological models that could consequently mislead the assessment of water risks. The result emphasizes the importance of developing high-resolution models to better understand the water balance, but it needs a tremendous effort mainly for collecting data of water infrastructure.</p>

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