HR: 13:55h
AN: H43J-02    [Abstracts]
TI: Quantitative Eatimation of Ground Water Recharge Process in Vadose Zone Beneath a Rice Paddy Field Using Cross-Borehole Radar
AU: * KURODA, S
EM: skuroda@affrc.go.jp
AF: National Institute for Agricultural Engineering, Kannondai 2-1-6, Tsukuba, Iba 300-1222 Japan
AU: Shiina, Y
EM: yoshinori-shiina@green.go.jp
AF: Tohoku reginal office of Ministry of Agriculture,Forestry, and Fishery, Aobaku honcho3-3-1, Sendai, MYG 980-0014 Japan
AU: Okuyama, T
EM: okuyama@nkk.affrc.go.jp
AF: National Institute for Agricultural Engineering, Kannondai 2-1-6, Tsukuba, Iba 300-1222 Japan
AU: Takeutch, M
EM: takeutch@nkk.affrc.go.
AF: National Institute for Agricultural Engineering, Kannondai 2-1-6, Tsukuba, Iba 300-1222 Japan
AB: Wet Rice Paddy field is one of most important components of land uses in monsoon Asia. It is known to have some other beneficial functions than food production, for example ground water recharge, purification of surface and subsurface water, and alleviation of flood. Though ground water recharge process of paddy field is essential for those functions, the actual conditions of ground water recharge process beneath paddy field has not been clarified besides in the zone of about 1m depth from soil surface. Recently cross borehole radar is recognized as one of usefull methods for measurement of soil water distribution and its change. We applied cross borehole radar for monitoring of soil water in vadose zone beneath a paddy field to clarify the ground water recharge process. Cross borehole radar monitoring clarified the infiltration process into the vadose zone and shallow ground water aquifer beneath the paddy field. We estimated the increment of soil volumetric water content from CRIME model, the descent velocity of wetting front, and infiltration rate from cross borehole radar data quantitatively. They were almost coincident with the directly measured results. Using these results,we tried to estimate permeability based on some hypothesis of infiltration process.
DE: 1866 Soil moisture
DE: 1875 Vadose zone
SC: Hydrology [H]
MN: Fall Meeting 2005