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ニセコなだれ情報第108号 Niseko Avalanche Info No.108

2013-2014最終号 Final issue

雪崩の発生には理由があり観察や気象データからある程度の予測はできる。しかし人の行動は予測できない。危険を予測して注意を呼び掛けても、人がそこに行けば雪崩に遇う可能性は高まる。冬の事故の多くは吹雪やその直後に起こっている。ニセコではコース外に出るゲートを設けて開閉の基準を定め、事故防止に役立てている。
ルールが定着してニセコの事故が減ったのに半比例し、ニセコ周辺の事故はむしろ増えている。コース外を滑る人が500人いてもニセコではほとんど事故は起きない。しかしその一方でイワオヌプリや羊蹄山などの事故が増えている。
春が来て雪が解け始めても山には人が入る。春の雪崩にも理由がある。過大なふきだまりの堆積、気温上昇などがそれにあたる。全層雪崩はその結果起こる。事故が起きないのは冬に比べて人が少ないという確率の問題でしかない。大沢、鉱山の沢、見返り沢や東尾根などの沢底を滑ってはならない。急斜面の下にとどまってはならない。この時期の雪崩は地形を変えるほどの大きな力で谷を走る。常に用心すること。用心すれば事故にあわずにすむ。今シーズンの雪崩情報を終了する。良い春山を。
 
Avalanches occurrence have causes, and some avalanches can be predicted by observations and evaluating weather data, however the most unpredictable things are human actions. Chances of accidents to happen will rise as the more people go to potentially hazardous terrain, no matter how much caution is being called. Most of winter avalanche accidents occur during and just after storms. Niseko has been using a gate system, setting opening/closing criteria to prevent accidents. Although the Rules has become common-sense and the accidents in Niseko diminished, the number of accidents in the surrounding area have increased. Even with 500 people in the out of bounds area, accidents hardly happens in Niseko, however accidents have kept happening in other areas such as Iwaonupuri and Mt Yotei.
Spring has come and snow started to melt, but still many people enjoy the snow. Spring avalanches also have causes. Overloaded snowpack and temperature rise are some factors that can lead full-depth slides. The reason why there are not many accidents in Spring, is that there are simply not many people riding. Stay away from the bottom of large valleys such as the Backbowl, Osawa, Mikaerisawa and Higashi-one, and stay away from other steep slopes. Spring slides are extremely destructive to the point of changing the terrain on its path. Always be prudent and vigilant, accidents can be avoided if you do. 
This season's avalanche info ends today. Enjoy the spring mountain.
| - | 11:31 | - | - | pookmark |
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