スイス南部・ローヌ河流域における雪線高度分布モデル(柳町,1988)について : WGIによって講評された,当該流域における雪線ならびに氷河上・下限の高度データによるモデルの再評価

概要

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Using the altitudinal data of snowline and, the upper and lower limits of glacier in the drainage basin of the Rhone, southern Switzerland, presented by "the World Glacier Inventory" , the altitudinal model for regional snowline in the drainage basin(Yanagimachi,1998) was revalued. In this model, the mean(μ) and standard deviation(σ) of regional snowline altitude are 3004m and 350m, respectively. The altitude of glaciation limit, which corresponds to the lower boundary of extrazonal glaciation, is 1954m(μ-3σ). The mean(μ_1) and standard deviation(σ_1) of snowline altitudes(n=214) presented by "the World Glacier Inventory" , on the other hand, are 3121m and 239m, respectively. These values are in general agreement with those in the above-mentioned model. All of the 214 snowline altitudes are distributed in the altitude of 1954〜4054m(i.e. μ±3σ), and nearly 81% of them are in a narrow altitudinal range of 2654〜3354m(i.e.μ±σ). Moreover, all of the upper limits of glaciers(n=638) presented by "the World Glacier Inventory" are distributed above the glaciation limit. From these facts, it can be concluded that the altitudinal model for regional snowline proposed by Yanagimachi(1998) is accurate enough for practical usage.
信州短期大学の論文
2001-12-25