那珂川と久慈川の河川環境

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タイトル別名
  • River environment of Naka River and Kuji River
  • ナカガワ ト クジガワ ノ カセン カンキョウ

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1 There are not many differences of the length between the mainstream of Naka river and mainstream of Kuji river. But compared with size of the basin, the number of municipalities of the baisn,the number of the branches,the population of baisn,the number of the golf links,the number of the industrial park, Naka river is 2~4 times bigger than Kuji river. There is a difference of 2~4 times.2 The electric conductivity of the mainstream of Naka river is 82.6~173.0μ℧/cm. the mainstream of kuji river is 33.0~238.0μ℧/cm. The electric conductivity of the branch of the Naka river is 57.8~584.0μ℧/cm. The branch of the Kuji river is 51.5~388.0μ℧/cm. Almost points are lower than 250μ℧/cm. At some branches, there are few points of the high values.3 In the mainstream of Naka river, the density of ions are high at the spot where takano river and Hoki river joins. Both rivers are flowring the hill country where tourist facilities gather and the city area where the population is concentrated. In the mainstream of kuji river, the density of ions are high at the Tanagura basin, the Daigo basin , flatland of the lower reaches. And low at stenosis place.4 There are many differences of the load of ions between the branches of Naka river. The density of ions are high at Hoki river and Arakawa river. Both rivers have city area, industrial parks, golf links in the basin. The density of ions of the Kuji river are high at city area near the Hitachiohta-shi, Tanagura basin , Daigo basins.5 At the Naka River, water is polluted in the alluvial fan where the hot spring outskirts and the population of the Naka River upper reaches gather, but the quality of water is improved in the ravine.Kuji River is polluted in the basin of the Tanakura Daigo. But the quaity of water is improved in the ravine.

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