ROLE DIFFERENCE AMONG RIVERS AFFECTED BY VOLCANIC ACTIVITIES OF MT. ONTAKE FOR WATER QUALITY OF THE NIGORIGAWA RIVER

Authors

  • Akiko Usami
  • Yoshitaka Matsumoto
  • Akihiko Yagi
  • Eiji Iwatsuki

Keywords:

Distribution of elements, Nigorigawa River, Mt. Ontake, Volcanic activity, Ontake Landslide

Abstract

To understand the influence of volcanic activities of Mt. Ontake on the Nigorigawa River, the distribution of elements contained in the water of the Nigorigawa was examined. The Nigorigawa has several tributaries such as the Akagawa River, the Shirakawa River, the Denjogawa River, and small streams. Sampling stations were located in the Nigorigawa and upstream rivers of it. These water samples were analyzed by the ICPE. The Akagawa and the Denjogawa show anomalous water quality. The amounts of elements in the water of the Akagawa are far more than those in other rivers (ex. S: 138 mgL-1, Fe: 34 mgL-1, Al: 33 mgL-1). The water quality of the Akagawa shown above is consistent with characteristic features in the volcanic zone. In contrast, the water of the Denjogawa contains large amounts of Na (46 mgL-1). It is likely due to dissolution from the sediment of Mt. Ontake, because the Denjogawa has a source in the Ontake Landslide, which was caused by the 1984 Nagano Prefecture Earthquake. It was found that the Akagawa and the Denjogawa play a role different from each other for forming the water quality of the Nigorigawa (the Akagawa: eruption, the Denjogawa: earthquake).

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Published

2019-06-29

How to Cite

Akiko Usami, Yoshitaka Matsumoto, Akihiko Yagi, & Eiji Iwatsuki. (2019). ROLE DIFFERENCE AMONG RIVERS AFFECTED BY VOLCANIC ACTIVITIES OF MT. ONTAKE FOR WATER QUALITY OF THE NIGORIGAWA RIVER. GEOMATE Journal, 16(58), 76–81. Retrieved from https://geomatejournal.com/geomate/article/view/2714

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