＜Review＞

Relationship between people and water in a river basin based on the understanding of public materials: a case study in the Nagara River basin using records of floods and fish catches

NAGAI Shin^*1*2, Taku M SAITOH^*2, Yasuyuki MARUYA^*3, Yuichiro FUJIOKA^*4, Satoshi WATANABE^*5

^*1Earth Surface System Research Center, Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
^*2River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
^*3Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
^*4Faculty of Social and Cultural Studies, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
^*5Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

Abstract

The relationship between people and water in a river basin has rapidly changed under climate and societal changes. We examined this relationship in the Nagara River basin, which has no dams across the mainstream. Our study focuses on the characteristic features of the basin such as floods and freshwater fishes by analyzing public materials covering periods of up to 100 years. We also discuss three new methods for examining changes in popular interest in the river basin with an emphasis on the methods’ usefulness and their issues: (1) temporal stratification of certain landscape features and uses photographic images, (2) Google Trends, and (3) geolocation information from mobile phones.

Key Words : anadromous fish; climate change; data mining; ecosystem service; river basin

(Received July 21, 2022. Accepted October 20, 2022)