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Evaluation of a water equivalent of snow cover map in a small catchment area using a geostatistical approach

✍ Scribed by Jürg Hosang; Katrin Dettwiler

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
675 KB
Volume
5
Category
Article
ISSN
0885-6087

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✦ Synopsis

We describe an objective method for evaluating the spatial distribution of water equivalents of the snow cover within a small catchment. Regression analysis is used to quantify the relationship between elevation, presence or absence of forest, and potential direct solar radiation as independent variables and water equivalent as m'easured at a number ofsites. First, this regression relationship is used to interpolate water equivalent data all over the basin area. Then we interpolate the residuals of the regression using a geostatistical approach. Superimposing the results obtained by interpolating the regression relationship and the interpolated residuals eventually yields the water equivalent distribution over the test area. The advantages of the interpolation method used lie in the optimal (effective, unbiased) estimation of the interpolated values as well as in the possibility to quantify the associated estimation variances.

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