Hydrogeological features of Kasanohara plateau [Kagoshima, Japan] based on water quality and its circulation
2005
Kubota, T.(National Inst. for Rural Engineering, Tsukuba, Ibaraki (Japan)) | Masumoto, T. | Matsuda, S. | Furue, K.
This paper studies hydrogeological features at a volcanic plateau "Kasanohara", Kagoshima, Japan, where the deterioration of water environment caused by agricultural activities has been actualized. Especially, the hydrological properties of aquifers, vadose zone and the geographical distribution of geological properties are analyzed by using the results of geological boring survey, hydrological observations and the construction of geological database based on information collected. As a result, the following hydrogeological features of the plateau were found: i) Hydraulic and physical properties of stratums were quantified; ii) The distribution of impermeable layers of unconfined groundwater in the plateau was quantified as the form of figure illustration; iii) The changes of the groundwater levels at three observation wells are smaller than those of other wells outside of the area although geological conditions are similar; iv) There is a stratification structure of groundwater quality and nitrate pollution in the lower layer.
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