System for detection of the event of shallow landslide using the composition and isotope database of particulate material in river water

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K06343
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 41050:Environmental agriculture-related
• Research Institution: Tottori University of Environmental Studies
• Principal Investigator: Kadono Atsunobu 公立鳥取環境大学, 環境学部, 准教授 (50511234)
• Co-Investigator(Kenkyū-buntansha): 小嵐 淳 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 原子力基礎工学研究センター, 研究主幹 (30421697) ; 山本 敦史 公立鳥取環境大学, 環境学部, 准教授 (40332449)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 土壌侵食 / 地下水質

Outline of Final Research Achievements

The elemental composition of the parent material in the river basin affects the particulate and dissolved material composition in river water. However, there are few models that can estimate changes in soil and river compositions throughout the basin. Therefore, river water was collected in the Sendai River basin, and the composition of particulate and dissolved materials were investigated. In addition, the geology, topography, soil, and precipitation distribution in the basin were integrated by GIS, and the factors explaining the particulate and dissolved materials composition at the sampling point were extracted.
As a result, as the parent material factor, granite affected the dissolved ion composition, and granodiorite/dacite affected a part of the particulate composition. As a meteorological factor, the intermediate runoff showed a significant positive correlation with the particulate content, but the runoff did not necessarily explained the variation of compositions.

Free Research Field

土壌学

Academic Significance and Societal Importance of the Research Achievements

地球規模での気候変動の顕在化により、増加する傾向のある表層崩壊や土壌侵食、洪水等の豪雨被害への関心は全世界的に高まっており、表層崩壊や土壌侵食の発生場所と規模を検知するシステムの構築につながる本研究は、大きなインパクトを持つと考えられる。特に、高度な防災システムを持たない途上国において、システムの簡便さからより大きな役割を持つと考えられる。また学術的にも、これまであまり正確な推定値が求められていない、日本近海に対する陸域からの河川経由の物質輸送量について新たな知見を提供できると考えられる。