広島市祇園町の地下水とその汚濁
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概要
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Gion-cho is one of the rapidly urbanizing areas to the north of Hiroshima City. Urbanization of the area has begun since 1964 when National Highway 54 was constructed. Land use in this area has changed from paddy fields to residential housing. Thus, the population of Gion-cho has increased from 25, 812 in 1965 to 40, 352 in 1971. The authors surveyed the groundwater conditions in this area in order to clarify the relationship between groundwater quality and urbanization. Items surveyed were depth of water table, pH, RpH, and the electric conductivity. These survey were carried out on the 29th June, 1965 and the 1st July, 1972. The results are as follows: 1) Gion-cho is situated on the flood plain of the Ota and Furu Rivers and the aquifer of non-confined water is found in the upper sands and gravels. Figs. 2 and 3 show that the groundwater of Nishihara flows from the Yasu River and the Yagi irrigtion channel to the Ota and Furu Rivers. On the other hand, the river water of the Yasu River and the Yagi irrigation channel is polluted with sewage from the surrounding urbanized area. However, this seems to have little effect on the quality of water in the Ota and Furu Rivers. The difference in the groundwater table as- shown in the figures may be caused by the heavy precipitation in June of 1972. 2) The change from 1965 to 1972 in groundwater quality are shown in Table 3 and Figs 2 and 3. In Nishihara, the value of the electric conductivity increased during these seven years. The pollution of groundwater in this area was caused by the increasing urbanization together with inadequate treatment of sewage.
- 地理科学学会の論文
- 1975-01-20