A hydro-environmental watershed model improved in canal-aquifer water exchange process |
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| Authors: | Chie Imagawa Junichiro Takeuchi Toshihiko Kawachi Kei Ishida Shunsuke Chono Natsuki Buma |
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| Institution: | (1) Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan |
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| Abstract: | Long-term simulation using the distributed hydro-environmental watershed model is efficacious for assessing irrigation impacts
on hydrological cycle in detail and for implementing watershed management successfully. In this article, the previously developed
hydro-environmental watershed model (HEWM-1) is improved in the water exchange process caused by surface water-groundwater
interaction via drainage canals and/or underdrains. The time-varying stream flow in canals is described by the complete one-dimensional
shallow water equations in a newly introduced submodel, the open channel flow submodel. This submodel coordinates with the
other submodels: the tank, soil moisture and groundwater flow submodels which are interlinked in a cascade manner. The improved
model (HEWM-2) is applied to an agricultural watershed covering an area from an alluvial fan onto a nearly level alluvial
plain, to be validated. The simulation by HEWM-2 is informative for identifying whether any drainage canal is gaining or losing
water in relation to groundwater level. It could thus provide useful information for conserving a complex network of drainage
canals which also functions as a passage for aquatic animals like fishes. |
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