Establishment on the distinction method between magafans and fluvial fans

2015 Fiscal Year Final Research Report

• Project/Area Number: 25350421
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geography
• Research Institution: Saitama University
• Principal Investigator: SAITO Kyoji 埼玉大学, 教育学部, 教授 (60170495)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 自然現象観測・予測 / 地形学 / 洪水 / 土砂災害 / 自然災害

Outline of Final Research Achievements

As the point of the Kosi megafan is located at an extension of the regression line between drainage basin areas and alluvial fan areas in the General Valley in Costa Rica, Kesel (1985) stated that megafans are possible to be members of alluvial fans. However, points of megafans are far above regression lines of 18 alluvial fans in Costa Rica, similar to lines in humid mobile regions of Japan, Taiwan, the Philippines, and New Zealand by Saito (2014). In consequent, megafans and fluvial fans can be distinguished by an extension of the highest regression line of the Philippines, since most of fans over 2 km2 in area are fluvial fans in these regions.

Free Research Field

自然地理学