Quantitative Volcanic Ash Fall Estimation by Weather Radar: <i>Z</i>-<i>R</i><sub>A</sub> Relationship for the Sakurajima Eruption of August 18, 2013

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  • MAKI Masayuki
    Research and Education Center for Natural Hazards, Kagoshima University
  • SUZUKI Ikuko
    Sakurajima Volcano Research Center, DPRI, Kyoto University
  • IGUCHI Masato
    Sakurajima Volcano Research Center, DPRI, Kyoto University
  • P.C. Shakti
    National Research Institute for Earth Science and Disaster Prevention

Bibliographic Information

Other Title
  • 気象レーダによる降灰量推定
  • 気象レーダによる降灰量推定 : 2013年8月18日桜島噴火のZ-R[A]関係式
  • キショウ レーダ ニ ヨル コウカイリョウ スイテイ : 2013ネン 8ガツ 18ニチ サクラジマ フンカ ノ Z-R[A]カンケイシキ
  • —2013年8月18日桜島噴火の<i>Z</i>-<i>R</i><sub>A</sub> 関係式—

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<p>The relationship between the time-integrated equivalent radar reflectivity factor (SZ) and the accumulated volcanic ash fall amount (SA) SA＝0.307×SZ0.504 (or SZ＝9.70×SA2.12), where the relationship is applicable to SA<2.0kgm－2 (or SZ<35mm6m－3h), was derived by analyzing weather radar data for the volcanic eruption of Sakurajima, Japan, on August 18, 2013. To derive the SZ-SA relationship, we constructed the three-dimensional Constant Altitude Plan Position Indicator (CAPPI) data of SZ. A total ash fall amount of 67,100 tons was estimated based on the relationship, and a total ash fall area of 102km2 was estimated based on the weather radar data. The relationship between the equivalent radar reflectivity factor (Z) and the ash fall rate (RA), RA＝1.41×Z0.350 was derived, assuming a trapezoidal model for the temporal change in RA. The effects of the radar data sampling height, the horizontal advection of ash echo, and the shape of the trapezoidal model on the derivation of quantitative ash fall estimation formulae are examined and the results are presented herein. Both the SZ-SA and Z-RA relationships that were derived in the present study are essential to quantitatively monitoring ash fall using weather radar data. Examples of ash fall monitoring, such as the accumulated ash fall distribution and temporal changes in the ash fall rate at specific points, are offered.</p>

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