八ケ岳火山山麓の水理地質学的研究
スポンサーリンク
概要
- 論文の詳細を見る
The water resources of a volcanic terrain are generally richer than those of other areas, because this type of land is made up of aquifers with excellant reservation capacity. However, the mechanism of groundwater storage and the groundwater flow process have not been made clear yet. For instance, it is difficult to explain the presence of springs halfway up some volcanoes. To investigate these points, the author studied the Yatsugatake volcanic terrain quantitatively for its groundwater storage mechanism and the relationship between the surfacewater and the groundwater of the terrain and constructed a water balance model of the general volcanic terrain. The Yatsugatake volcanic area is made up of the Yachiho and the Hirose groups which form the independent sedimentary basins each other corresponding to the shift of the volcanic activity center. In addition, each basin form a groundwater basin and a long and wide regional flow system which move from the volcanic body to the piedmont. The unite aquifers constitute the formations in the Yachiho and the Hirose groups. The 5 groundwater zones in the Yatsugatake terrain show different characteristic of groundwater and are divided from the volcanic body to the piedmont. i) Volcanic body recharge zone : This is a recharge zone made by precipitation. There is no base flow into the valley. ii) Middle recharge zone : This zone is located in the upper part at 1,600m altitude, where the spring groups in the valley form a line along the contour line. About 10% of the groundwater flowing from the upper part is discharged along this line. iii) Middle spouting zone : This zone has many springs on the piedmont planation surface. About 40% of the groundwater flows from the discharges of the upper zone. iv) Lower leak zone : This zone is situated on the piedmont planation surface and faces the deep valley which marks the edge of the terrain. The potential of confined groundwater is about 10m lower than the unconfined groundwater in the area. v) Lower spouting zone : This zone is found in the deep valley which marks the edge of the volcanic terrain. All of the recharged groundwater of the terrain is discharged in this area. The water balance of every zone were calculated with the surface water discharge. The result of this calculation showed clearly that the base flows of the rivers of the lower zones rather than the middle recharge zone were supported by the constant discharge of groundwater. The groundwater table draw down rate which supports the base flow was 0.032m/day in the middle recharge zone, 0.017m/day in the middle spouting zone and 0.004m/day in the lower spouting zone. Base flow in the lower leak zone decreases due to the leakage to groundwater, and it increases in the paddy field due to the leakage from surfacewater.
- 信州大学理学部の論文
- 1982-09-30
著者
関連論文
- 琵琶湖湖底堆積物, 過去145,000年間の粗粒石英の堆積量変化
- 兵庫県南部地震に対する大阪平野の地下水の反応--地震動の地下水の動き
- 中部ジャワ・サンギランのM-B地磁気逆転境界(29.第四紀地質)
- 地質学論集第30号 日本第四紀層序区分とその国際対比
- シンポジウム「大都市圏の完新統に記録された人と自然の相互作用」開催にあたって
- 第四紀(入門講座)
- 八ヶ岳火山活動と堆積盆の移動 : 火山及び火山岩
- 八ヶ岳東麓の第四系の概観 : 第四紀
- 八ヶ岳東麓の第四系 : 第四紀
- 443. 鳥取県北条砂丘の地下水
- 3 上部更新統中の"不整合" : 人為を含む古環境に関して
- 後期更新世以降の野尻湖の変遷 : コメント
- 6 中部(信州)の第四紀層
- 小諸地すべりの現況と対策について
- 八ヶ岳山麓の第四系(1) : 八ヶ岳東麓に分布する第四系の概観 : 第四紀
- 地質年代に関する最近の問題点
- 「和歌浦の干潟見学と現地セミナー」報告
- 講演 大根島の地下水 : 淡水レンズをめぐる問題点
- 房総半島上総層群の珪藻生層序
- 第四紀層序学
- 第四紀総研総括シンポの開催にあたって (第四紀総研総括シンポジウム)
- シンポジウム「八ケ岳山麓の第四系--長期の火山活動を湖成層から読む」の開催にあたって (「八ケ岳山麓の第四系--長期の火山活動を湖成層から読む」シンポジウム特集号)
- 第四紀研究者の立場からのコメント(地質学サバイバルの道をさぐる)
- 信州地域の第四紀層 : とくに,鮮新・更新統と中部更新統について
- 八ケ岳火山山麓の水理地質学的研究
- 大阪平野の地下水 : 大阪地下水盆広域流動系の概要
- 中国黄土高原の黄土-古土壌層序と大阪層群中の相当層準に含まれる石英について〔英文〕
- Diatom Biostratigraphy of the Kazusa Group, Boso Peninsula, Honshu, Japan.