tangqh@iis.u-tokyo.ac.jp [cor1]Corresponding author. Tel.: +81-3-5452-6381; Fax: +81-3-5452-6383.

Abstract:

Recent advances in hydrological processes research make it widely accepted that runoff absorbing processes can considerably affect hydrological response. The redistribution of surface runoff by natural force or human activity becomes the dominating processes in arid area. In this paper, we concentrate our attention on runoff-evaporation processes and try to systematically represent water dispersion and consumption at the river basin scale. The runoff-evaporation processes are grouped into lateral and vertical processes. Lateral fluxes are related to water dispersive processes roughly parallel to the terrain surface. Vertical fluxes occur by redistribution processes of surface water such as evapotranspiration, infiltration and percolation during all the dispersive processes. A runoff-evaporation (RE) hydrological model representing both lateral and vertical fluxes is introduced and employed in an endoreic river basin of central Asia. The hydrological system is thought to consist of river way, irrigation channel, irrigation area and non-irrigation area. The model is based on water balance of each component of the hydrological system and driven by monitored water withdraws and meteorological data. The main runoff-evaporation processes in the endoreic river basin is reproduced and validated by the hydrograph at downstream gauge and the groundwater depth in irrigation area.

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