国立研究開発法人 国際農林水産業研究センター | JIRCAS

Simulation of Soil Water and Heat Transfer under Subsurface Irrigation Considering Spatial Differences in Soil Hydraulic Properties

JARQ : Japan Agricultural Research Quarterly
本文フルテキスト

Enhanced irrigation efficiency is necessary to address water shortages, and precise estimation of soil water movement by simulation models is essential. Previous studies have suggested that soil hydraulic properties, which are important factors of soil water movement, differ spatially in the horizontal and vertical directions. However, those studies have estimated soil water movement by considering soil hydraulic properties only along the soil profile. In the present study, we defined soil hydraulic conductivity and soil water retention as soil hydraulic properties, and conducted soil water movement simulations considering the spatial (horizontal and vertical) differences in soil hydraulic properties. The simulation model also estimated soil temperature to include water vapor transfer in the estimation of soil water movement. We validated the model by comparing simulated and observed results from a pot experiment, and comparing the soil water movement and soil temperature in two cases of applying the soil hydraulic properties: spatial application and vertical application. The results showed that the simulated soil temperature differed from the observed values due to the uniform application of soil thermal conductivity. Our findings indicated that the differences in soil water movement between both cases increased with the number of irrigations.

刊行年月2020-04-01
作成者Kosuke HAMADAYoshiyuki SHINOGITomoyuki TANIGUCHIHidetoshi MOCHIZUKITakeshi TAKEMURA
著者キーワードsoil water distributionhydraulic conductivitysoil water retentionwater conservation
公開者Japan International Research Center for Agricultural Sciences
データ作成日2020-04-01
受理日2019-08-22
受領日2018-10-25
54
2
開始ページ153
終了ページ162
DOI10.6090/jarq.54.153
言語eng