-
Eisuke Ono, Naoto Koiwa, Yoshiki Sato
Session ID: P001
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Kiyotaka NAKAGAWA, Yasushi WATARAI
Session ID: 504
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
--- Applications for Ancient Typhoon Predictions using Diatom and Chrysophytes Assemblages –
Kaoru Kashima
Session ID: P010
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
In this paper, the eventual typhoon deposits in coastal lake deposits were presumed using diatom and Chrysophytes fossil assemblages. The research areas are two coastal lakes along the western Kyushu, Lake Namako-ike at Kamikoshiki Island and Lake Daijya-ike (Ikeda-ike) at Amakusa Peninsula, and we presumed ancient huge typhoon hazards during 7500 years. The eventual typhoon depositions had repeated in the both lakes. We presumed 10 layers of huge typhoons at Lake Daijya-ike (Ikeda-ike), and 8 times at Lake Namako-ike until 6300 cal. yBP using diatom and Chrysophytes fossil assemblages.
View full abstract
-
Takashi WADA
Session ID: 341
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Taku Komatsubara, Yoshiki Sato
Session ID: 241
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
The Way of Education Instruction and Change of the Ideology
Yukio Yamaguchi
Session ID: 432
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Masateru HINO, TIN MOE LWIN, Fatwa RAMDANI
Session ID: 416
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
As for the urbanization of the Southeast Asia since the 1990s, the concept of extended mega region and new middle class has been presented through studies on Jakarta and Bangkok metropolitan regions. Whether the growth of Yangon following the transformation from socialist economy to market economy in 1988 shows a similar trend or not is an interesting agenda. The expansion of the urbanized area of Yangon was still being primarily limited to within the Yangon City boundary, so its spread can’t be said to have reached to the level equivalent to that of an extended metropolitan region.
View full abstract
-
Case of GLOBE Program in Japan
Yasunori SAWADA, Kyoko SUZUKI, Machiko TSUBAKI, GLOBE Japan Center
Session ID: P044
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Analysis of Geography Textbooks in Junior High School at China and Japan
Yasunori SAWADA
Session ID: S103
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Shun MATSUO, Yasunori SAWADA
Session ID: P022
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
A Case of Tokyo Shibaura Denki
Satoshi YAMAGUCHI
Session ID: 343
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Kenji TANI
Session ID: P048
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Takahito Kuroki
Session ID: 243
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
In this reserch, I estimated the area affected by natural disasters based on the votive offerings of shrines in the lower reaches of the Chikugo River
View full abstract
-
Eisuke Ono
Session ID: S304
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Symbiotic society host town at Tokyo 2020 Games
Atsushi NARUSE
Session ID: 345
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Review of a Concept of Geographical Scale
Seia Hisai
Session ID: 349
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Junpei Hirano
Session ID: 513
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
TERUO HATAKEYAMA
Session ID: 338
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
MINORI MATSUOKA
Session ID: P045
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Takashi Nakazawa
Session ID: 318
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
What is the significance of Chinese geography
Toshimitsu TABE, Guo Ming
Session ID: S101
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Meri Nakajima
Session ID: 347
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Focusing on Chinese Reginal Geography Study
Hirokazu TAKEUCHI
Session ID: S106
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
Against the backdrop of rapid economic development, China has become a nation that has a great influence on the political and economic activities of the world. China is one of the most important learning subjects in geography education. In this report, based on the presentations 1 to 5 at the symposium, I would like to consider the perspectives for understanding modern China and the perspectives for world regional geography lessons.
View full abstract
-
Hideaki Goto
Session ID: P007
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Takehiko MIKAMI, Masumi ZAIKI, Naoko HASEGAWA, Junpei HIRANO, Togo TSU ...
Session ID: 514
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
In Japan, official meteorological observations by the Japan Meteorological Agency started only after the 1870s, which was too short to objectively discuss long-term climate change on a scale of decades to centuries. Therefore, the actual conditions and regional differences in climate change since the Little Ice Age in East Asia, including Japan, have not yet been clarified. Based on diary weather records and meteorological observation data, we reconstructed winter and summer temperature fluctuations over the past 320 years from 1701 to the present to clarify the actual conditions of long-term climate change and analyzed the seasonal and regional differences.
View full abstract
-
Jun ONODERA
Session ID: S105
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
The regional geography has been described with the scope of the nation as a given, but the framework of the nation itself has to be re-questioned and the relationship between the nation and each region must be carefully interpreted. In this presentation, we will consider what the Chinese geography should be, taking Hong Kong as an example in recent years.
View full abstract
-
Erika MIURA, Koji KODERA
Session ID: P024
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
Ⅰ Introduction
Ⅱ Research Methods
Ⅲ Results and Discussion
Ⅳ Conclusion
View full abstract
-
Yoshimichi Yui, Yasuhiro Kumahara
Session ID: S307
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Guimin ZHANG
Session ID: S104
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Daichi NAKAYAMA
Session ID: P016
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
1. Introduction
Miyake Island erupted five times in 2000, producing volcanic mudflows. As a result, mudflows were deposited in residential areas around the island, and bridges on the road that circles the island collapsed. However, the occurrence of these volcanic mudflows and the distribution of the damage may vary depending on the deposition of volcanic ash and the intensity and spatial distribution of precipitation. Therefore, it is important to identify the topographic locations where mudflows are likely to occur and accumulate so that countermeasures can be taken against future volcanic mudflows. For these reasons, this study uses decision trees, a type of machine learning, to predict the occurrence of volcanic mudflows on Miyake Island, and to simulate mudflows to study the arrival time and extent of volcanic mudflows.
2 Estimation of the location of volcanic mudflow generation and deposition using decision trees
Eight types of topographic characteristics (elevation, slope, plan curvature, profile curvature, erosion height, uneroded height, sediment transport index, and wetness index) were calculated using a 1-meter resolution DEM acquired by aircraft laser survey as explanatory variables for the decision tree, and the descriptive statistics of each topographic characteristics were calculated on a 50-meter mesh. The descriptive statistics of each geomorphic characteristiccs were aggregated on a 50-meter mesh. The occurrence and depositional areas of volcanic mudflows, which were determined from aerial photographs taken in November 2000, were converted to the 50-meter mesh described below and used as objective variables.
As a result, a decision tree with a correctness of 68.85% and a kappa coefficient of 0.528 was obtained from the weighted confusion matrix. Figure 1 shows the obtained tree and a map of the ends of the tree.
Figure 1 shows the distribution of the tree ends as follows. Erosion 1 is located near the summit of Oyama, where a large amount of volcanic ash was deposited by the 2000 eruption. On the east side of Mt. Oyama, mudflows generated by Erosion 1 join mudflows generated by Erosion 2 and Erosion 3 and flow down to the coast along the valleys of Erosion 2, Erosion 4 and Erosion 6. The mudflows that flowed down to the coast overflowed the channel of sediment 4 in the flat area near the coast and deposited in sediment 5. On the west side of Oyama, volcanic mudflows generated by erosion 1 are deposited in the meshes of sediments 1 and 3 (near the former village farm). From erosion 2 and 3, mudflows are generated by secondary erosion of the mudflows deposited in sediments 1 and 3 and by erosion of the volcanic ash deposited on the west side of Mt. The mudflows that flowed down to the coast overflowed the channel of sediment 4 in the flat area near the coast and were deposited in sediment 5.
3 Calculating the arrival time and arrival range of mudflows using a mudflow model
Numerical simulations of volcanic mudflows were conducted to determine the arrival time and arrival area of volcanic mudflows. The aforementioned 1-meter DEM was downscaled to 5-meter resolution, and calculations were performed in three areas of Miyakejima (Kamitsuki area, Tsubota area, and Yukeihama and Village Farm areas). In the Kamitsuki area, the mudflow generated near the top of the caldera reaches Kamitsuki in about one hour. In the Kamitsuki area, the mudflow generated near the top of the caldera takes about one hour to reach Kamitsuki, and several erosion control dams along the downstream valley are found to delay the arrival of the mudflow. In Yukeihama and Village Farmarea, the mudflow reaches the former Village Farm within 20 minutes after the occurrence of the mudflow, and from there it reaches the Yukeihama in about 40 minutes.
View PDF for the rest of the abstract
View full abstract
-
Takashi SHIMURA
Session ID: S306
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Satoshi Yokoyama, Shinichi Takahashi, Takahito Niwa, Futoshi Nishimoto
Session ID: P031
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
This study clarified the population dynamics and changes in paddy field holdings over three generations in two villages located in a basin with limited arable land in Ngoi District, Luang Pabang Province, northern Laos. In the study area, people from mountainous areas have migrated since the 1970s, but many of them are still engaged in swidden agriculture because of the lack of paddy fields. Many households have to go to urban areas to work. Residents who migrated from the mountainous areas had to choose between staying in the basin, where paddy fields are scarce, or moving to the urban areas.
View full abstract
-
Shoichiro Fuwa
Session ID: 410
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
The case of elementary and junior high schools in Nagano City
Kotoe UCHIYAMA
Session ID: P018
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Usefullness and limitations of 5 m- grid- DEM
Isao AKOJIMA
Session ID: P014
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Ryo TANIMOTO, Tomoya HANIBUCHI
Session ID: 440
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
A case study of Fukushima University and Miharu-machi, Fukushima Prefecture
Toshio Hatsuzawa
Session ID: 450
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Keiju Kimura, Yoshihiko Kariya
Session ID: 237
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Lingyun REN
Session ID: P053
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
-Its Changes and Prospects -
Taishi Morita
Session ID: 435
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Akihiko NAEMURA, Kei SAITOH, Tomoaki OKUDA
Session ID: 534
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
Secondary NOx concentrations in the upper reaches of the Takahashi River in Okayama Prefecture were investigated, and O3 concentrations averaged 24.0 ppb, 0.87 times that of Tokyo Tower. The high O3 concentration was attributed to transboundary pollution from the Asian continent. The NO3- concentration in the stream water was 5.68 micromol/L. Although the NO3- concentration in the stream water was time-representative, this catchment was dominated by cedar, cypress, and sawara plantations (89.8%).
View full abstract
-
Daichi NAKAYAMA, Mizuki TATENO, Vadim KHROMYKH, Oksana KHROMYKH
Session ID: S403
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
Land cover changes since 2000 in the vicinity of Tomsk City, West Siberia, were determined using Google Earth Engine.
Normalized vegetation indices, normalized water indices, normalized snow indices, and normalized soil indices were calculated from satellite images of the target area acquired by Landsat 5, 7, and 8.
In addition, slope, plan curvature, profile curvature, watershed area, topographic flatness, sediment transport index, and wetness index were calculated from DEMs acquired by SRTM.
The land condition polygon data around the year 2000 was used to create the teacher data, and the classifier of the land cover in the 2000s was created by random forest.
We used this classifier to classify the satellite images of the 2010s and 2020s, and calculated the change in land cover classification.
The results showed that the land cover change due to human influence was large in the decade from 2000s to 2010s, while the land cover change in the decade from 2010s to 2020s was small compared to the decade from 2000s.
View full abstract
-
Comparative study in three beech forest stands: Preliminary Report
Yasuhiro Ohnuki, Mahoko Noguchi, Tatsuhiko Nobuhiro, Naoyuki Yamashita ...
Session ID: 218
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Hideaki Yanagisawa, Toyohiko Miyagi
Session ID: 407
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
An Example from Residents’ Movement in Japan’s First Public Housing Estate
Hiroya ICHIMICHI
Session ID: 344
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Masato ODA, Koji KODERA
Session ID: 537
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
In the Asakawa River of the Tama River system, there are issues such as pollution caused by domestic wastewater. In order to understand the water quality and characteristics of the basin, not only field surveys but also comprehensive studies that combine various methods are required. The purpose of this study is to clarify the basin characteristics of the Asakawa River through the results of field surveys, water quality analysis, and statistical analysis using the results.From this study, four issues were identified in the Asakawa River basin: the delay in the installation of municipal combined septic tanks in the upper reaches of the river and the pollution caused by septic tank effluent; the outflow of nitrate due to nitrogen saturation in the forest ecosystem in the upper reaches; the pollution caused by the inflow of effluent from the Kitano Sewage Treatment Plant into the Yamada River; and the pollution caused by domestic wastewater from the Yudono River basin. In order to solve these problems, the maintenance of the watershed environment is required.
View full abstract
-
Case of Kaida Plateau, Nagano Prefecture
Kenichiro HATANAKA, Yoshie URAYAMA, Takeshi SUKA
Session ID: P055
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Focused on learning for disaster prevention
Hiroaki Sakaue
Session ID: 433
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Hitoshi Saito, Yoshihiro Iijima, Takashi Kirimura, Alexander N. Fedoro ...
Session ID: S407
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Yuki Kurisu, Koichi Kimura, Yusuke Motojima
Session ID: 434
Published: 2022
Released on J-STAGE: March 28, 2022
CONFERENCE PROCEEDINGS
FREE ACCESS