INCORPORATING AQUEDUCTS TRANSFER THROUGH INDUS BASIN IRRIGATION SYSTEM TO GLOBAL HYDROLOGICAL MODEL

Abstract

 Global hydrological models used in higher resolution require representation of water transfer through aqueducts. In this study, we tried to evaluate water demand and supply more accurately by incorporating aqueducts in Indus Basin which are formed by many canals and links uniting rivers. To represent these aqueducts, we used aqueducts transfer scheme of H08, one of global hydrological models. In order to use this scheme, we collected information from literatures and maps and created the data showing water sources for each water-demanding area. Besides, we considered the effects of links by assuming barrages which are located upstream from the water-demanding area and indirectly supplying water there are also treated as water sources. Because of this, the evaluation of demand and supply became more realistic. The difference between the observed and simulated amount of water withdrawal considering aqueducts became one third of that without aqueducts expression. Also, irrigated areas where water supply hadn’t been represented realistically decreased.