Re-evaluation of the Water Budget around Mt. Aso Using Hydrometeorological and Satellite Data.

• MATSUYAMA Hiroshi

  Graduate School of Science, Tokyo Metropolitan University

• IZUMI Takeki

  Graduate School of Science, Tokyo Metropolitan University

Bibliographic Information

Other Title

• 水文・気象・衛星データを用いた阿蘇山周辺の流域水収支の再検討
• スイモン キショウ エイセイ データ オ モチイタ アソサン シュウヘン ノ リュウイキ ミズ シュウシ ノ サイケントウ

Abstract

The water budget around Mt. Aso is investigated from January 1996 to December 1998, when the budget is considered to be stationary. First, by using the 1 km grid-interval digital elevation models, the 9 basins are selected which cover Aso Pyroclastic Flow deposits. Next, the Radar-AMeDAS precipitation (P) and river runoff (Ro) are used to calculate their annual difference (P-Ro), which is compared with the areal evapotranspiration (E). E is estimated considering land use and elevation, based on the energy budget of the meteorological observatories. In advance, the land use data of the Geographical Survey Institute and Landsat TM image (taken on 22nd May, 1998) are used to classify the surface condition. The spatial average of the annual difference (P-Ro) of the 9 basins is larger than E. It is beyond the range of observational and estimation errors, due to the overestimation of P. After correcting P with the use of 23 AMeDAS station's data around the study area, the annual difference (P-Ro) and E in the 9 basins is within the range of the errors. Still, the significant differences between P-Ro and E are found in the Kase-river, Midori-river, and Oita-river basins. The quantitative discrepancies of the water budget in the latter two basins are the original findings of the present study. The discrepancy of the water budget in the Oita river basin implies the possibility that the budget does not completely close in the western foot of the Aso volcanos alone. In conclusion, it is necessary to treat the entire central Kyushu as a study area when the water budget in this region is investigated.

Journal

• JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES

  JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 15 (4), 413-427, 2002

  THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES

Keywords

• Water budget in the basin, Aso Pyroclastic Flow deposits, Groundwater movement, Radar-AMeDAS precipitation, Observational and estimation errors

Details

• CRID: 1390001204439677184
• NII Article ID: 10008835450
• NII Book ID: AN10088049
• DOI: 10.3178/jjshwr.15.413
• ISSN: 13492853
• ISSN: 09151389
• ISSN: http://id.crossref.org/issn/09151389
• NDL BIB ID: 6200391
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6200391
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed