000			01701pab a2200181 454500
008			180718b2002 xxu||||| |||| 00| 0 eng d
100			_aLaternser, Martin
245			_aTemporal trend and spatial distribution of avalanche activity during the last 50 years in Switzerland
260			_c2002
300			_ap.201-30.
362			_aNov
520			_aAvalanche observations are an important factor for operational avalanche warning and the main parameter to carry out an objective verification of the avalanche bulletin in retrospect. For the first time, a 50-year long series of avalanche activity data of 84 Swiss avanche observation stations is analysed and discussed. After careful data preparation a regional avalanche activity index (RAAI) for seven snow-climatological regions of Switzerland was developed. Using different statistical descriptors, we were unable to detect a long-term change in avalanche activity, which stands in contrast to a significant increase of winter percipitation. The comparison of the RAAI with a comprehensive database for destructives (DADB) resulted in a low correlation. This shows clearly the difficulties involved in determining a good measure for specifying the true avalanche activity. Depending on the degree of the avalanche activity DADB and avalanche observations represent the avalanche activity differently and overlap. Suggestions are given for the improvement of the ongoing avalanche observation programme in order to achieve an overall consistent and reliable data set in future. - Reproduce.
650			_aAvalanches - Switzerland
650			_aAvalanches
700			_aSchneebeli, Martin
773			_aNatural Hazards
909			_a54751
999			_c54751 _d54751