Comparison between observed and calculated snow depths using a multi-layer snow densification model in Hokuriku

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  • 積雪の多層圧密モデルを用いた北陸地方の降積雪現象の解析
  • セキセツ ノ タソウアツミツモデル オ モチイタ ホクリク チホウ ノ コウセキセツ ゲンショウ ノ カイセキ

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Abstract

In Hokuriku, horizontal distribution of snowfall intensity is heterogeneous and the snow compactive viscosity coefficient significantly changes over time because the temperature fluctuates near zero degrees Celsius in the snowy season. Comparison between observed snow depth and hourly calculated snow depth using a multi-layer densification model of the snow layer with data from meteorological observations is performed to obtain the horizontal distribution of some characteristics related to the snowfall and the snow densification. It is found that the temporal change of the snow compactive viscosity coefficient is important to estimate the correct snow depth in Tohkamachi; 18% overestimation of the seasonally averaged snow depth results from failure to consider the temporal dependency of the snow compactive viscosity coefficient related to the moistening and the granulating of the snow layers. The following results are also found from comparison between the observed and calculated snow depths at the meteorological stations: 1) hoaring or sintering often occurs in mountainous regions of Nagano and Fukushima Prefectures; 2) the snow depth cannot be correctly estimated without humidity data at Fukui Prefecture and the southern part of Niigata Prefecture; 3) knowledge of the correct compactive viscosity coefficient of the snow layer is important for estimating the snow depth in other areas.

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