INFLUENCE OF WATERSHED CHARACTERISTICS ON FLOOD DISCHARGE AT 46 WATER LEVEL STATIONS IN JAPAN: FINDINGS FROM FACTOR ANALYSIS AT DIFFERENT SCALES OF FLOOD

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  • 全国46地点を対象とした流域特性が洪水流量に及ぼす影響に関する研究
  • ゼンコク 46 チテン オ タイショウ ト シタ リュウイキ トクセイ ガ コウミズリュウリョウ ニ オヨボス エイキョウ ニ カンスル ケンキュウ

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Abstract

 We examined relationship among specific discharge of flood and rainfall, geomorphology, land use and geology to reveal the influence of watershed characteristics on flood discharge. As a result of a correlation analysis, hourly rainfall depth was the most major factor to determine the flood discharge. Among the geomorphological factors, form factor and topographical gradient were major factors of increasing flood discharge. However, the effects of these factors differed by flood scale. In the land use factor, there was no clear relationship between broadleaf forest and flood discharge for each flood scale. Whereas, coniferous forest was factor to increase flood discharge at low frequency event.

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