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Title: 尾瀬ヶ原における湿原地下環境に関する水文地形学的研究
Other Titles: Hydrogeological studies of the underground environment in Ozegahara mire ecosystems
Authors: 野原, 精一1 Browse this author
村田, 智吉2 Browse this author
藤原, 英史3 Browse this author
安類, 智仁4 Browse this author
福原, 晴夫5 Browse this author
Authors(alt): Nohara, Seiichi1
Murata, Tomoyoshi2
Fujiwara, Eiji3
Anrui, Tomohito4
Fukuhara, Haruo5
Keywords: 泥炭地湿原
environmental change
Ozegahara mire
underground environment
Issue Date: 31-Mar-2022
Publisher: 低温科学第80巻編集委員会
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 80
Start Page: 43
End Page: 60
Abstract: 本州最大の泥炭地・山岳湿原である尾瀬ヶ原においてUAVの航空写真を撮影して地形図を作成し詳細な地形把握が可能となった.2012年のEM探査で研究見本園と上田代に高電導度層が泥炭層に観測され,約1,300年前の降水量の増大に起因した猫又川由来の河川堆積物と推定した.2019年4月末には,UAVによる湿原積雪を撮影し,KA1-04では池溏北西部に早い融雪があり地下水の流入が大きいと考えられた.その池溏北西部底に円形にくぼみが見られ,常に水温が周囲よりやや高く,融雪時に日周変化が早く出現し常に湧水で涵養され融雪が早く起こった.中田代では積雪が4mに達して,地下水位に影響を与え近隣の池溏NA5-43の積雪下の水位変化に影響を与えていた.高電気伝導度の池溏が多く見られ,河川や地下水起源の流入が推定された.水中ドローン画像の解析を行い竜宮の形状や生息している水生動物の分布について明らかにした.深度1.5mのほぼ水平に地下水路がT字になっていた.地下水路内上部には泥炭の亀裂があり泥炭堆積層に約20cmの地層のずれがあった.6世紀後半~7世紀前半以降に泥炭地の地滑りがあり,それがきっかけで河川水路が地下水路になったと推定した.
Ozegahara mire is the largest mire and located on the amphitheater-shaped basin surrounded by high mountains of 2,000 m in Japan. We tried more precise mapping of 3D using UAV (unmanned aerial vehicle), and we objected to be clearly the efficient mapping of ground form using the UAV method by comparing 3D maps. We conclude that vegetation surveys using UAV are possible and are capable of a highly precise community division in places where field reconnaissance is difficult. Aerial photographs of snow on the peatland taken by a UAV on late April 2019 by UAV,Early melting snow was began at northwestern area of bog pool of KA1-04. The bog pool had a bare dimple in the northwestern center. The area was always warmer than other sediments at the melting season with diurnal variation by ground water inflow. The maximum snow depth at the Nakatashiro area was 4 m, the snow pressure made an impact on water level of nearby bog pool of NA5-43. EM exploration (electromagnetic- method) was conducted on peat land of Kenkyumihonen and Kamitashiro area, the middle layer of 1 m depth peat was expected the river sediment by flooding from Nekomata river of 1,300 years ago. There were many bog pools of high electrical conductivity, the sources were expected the river and ground water. The shape of underground channel of the Ryugu and the aquatic animals' distribution were shown by image analysis of water drone. The ground water shape was T-shaped in the 1.5 m depth peat layer. There was sliding of strata showed by the volcanic ashes in the peat layer of 20 cm depth. The sliding of strata was expected to create an opportunity of ground water channel by the cause landslide between the late 6th century and the beginning of the 7th century
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第80巻

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