open access

https://doi.org/10.14943/lowtemsci.80.43

https://hdl.handle.net/2115/85015

Hydrogeological studies of the underground environment in Ozegahara mire ecosystems

日本語

underground environment

2022-03-31

低温科学第80巻編集委員会

Low Temperature Science

80

43-60

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

紀要論文

Version of Record

1880-7593