Japan Geoscience Union Meeting 2016

Presentation information


Symbol H (Human Geosciences) » H-GG Geography

[H-GG13] Use and management of natural resources and environment

Wed. May 25, 2016 1:45 PM - 3:15 PM 101A (1F)

Convener:*Gen Ueda(Graduate School of Social Sciences, Hitotsubashi University), Yoshinori OTSUKI(Institute of Geography, Graduate School of Science, Tohoku University), Chair:Yoshinori OTSUKI(Institute of Geography, Graduate School of Science, Tohoku University), Gen Ueda(Graduate School of Social Sciences, Hitotsubashi University)

1:45 PM - 2:00 PM

[HGG13-01] Impact of the 2011 Japan earthquake and tsunami on the marine leasure use and indirect effect on the coastal ecosystem: a case study in inner Tokyo Bay.

*Takehisa Yamakita1, Yoshimi Matsuoka1, Shinpei Iwasaki2 (1.Japan Agency for Marine-Earth Science and Technology, 2.Fukuoka Women’s University)

Keywords:Great East Japan Earthquake 2011, human behavior, marine leisure use, shellfish gathering, tourism statistics, Tokyo Bay

From a historical viewpoint, there has been a close interrelationship between human activity and the natural environment in coastal areas. Most large cities were built in coastal areas and benefitted from the natural resources there, including living aquatic species, and water-oriented transportation. Although there was no special attention paid to such a human–nature relationship during the era of high economic growth, it has recently been revaluated and better understood. These relationships were also emphasized in the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES), which was established to mainstream biodiversity conservation and build a sustainable society after the decision of the 10th Conference of Parties of the Convention on Biological Diversity (CBD-COP 10) in 2010 and the 2007 meeting of the G8+5 Environment Ministers in Potsdam, Germany.
However, damage from the 2011 earthquake and tsunami in Japan might have damaged those relationships. In order to investigate the effects of the earthquake and tsunami on the use of tidal flats, we used questionnaires to evaluate changes in the number of users for each type of usage of the Sanbanze tidal flat at the innermost part of Tokyo Bay.
As a result, we found that clamming and walking or jogging were the most common uses of the survey area. However, clamming activity decreased after the earthquake. The decrease was confirmed by a field survey, which also showed a greater decrease in the number of visitors (80% decrease) than that suggested by the questionnaires (64%). Many people were anxious about the seawall failure and about land liquefaction, which physically damaged infrastructure. Because other regions showed similar trends in attitudes and usage, we suspect the ultimate cause of the anxiety caused by physical damage which spread universally.Correspond to the change of the human use larger sized Japanese littleneck clam are increased. However the number was decreased subsequently.