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Paper Information

Journal:   IRANIAN JOURNAL OF WATERSHED MANAGEMENT SCIENCE AND ENGINEERING   FALL 2008 , Volume 2 , Number 4; Page(s) 49 To 55.
 
Paper: 

APPLICATION OF GEOSTATISTICAL ANALYSIS IN SNOW DEPTH AND DENSITY IN ORAZAN WATERSHED

 
 
Author(s):  VAFAKHAH M.*, MOHSENI SARAVI M., MAHDAVI MOHAMMAD, ALAVIPANAH S.K.
 
* NATURAL RESOURCES DEPARTMENT, TEHRAN UNIVERSITY, IRAN
 
Abstract: 

Geostatistical analysis was applied for snow depth and density estimating. This research was conducted in Orazan sub-basin located in Taleghan watershed which comprises 2706 km2 in area. Field sampling was performed based on random-systematic method with random start in different heights during February 2008 and distances between samples was equally 100 m. Depth and density of snow was measured in every point. The experimental variogram was plotted by using 98 field sampling points. The experimental variogram of snow depth and density indicated that spherical model is the best one for snow depth and density. The nugget, sill and effective range of the spherical snow depth model are 0.0010, 0.05, and 186 m, respectively and those variables of the spherical snow density model are 0.0103, 0.0485, and 7968 m, respectively. The experimental variogram of snow depth revealed more than 80% sill, implying strong spatial auto-correlation between samples but the experimental variogram of snow density revealed more than 80% nugget effect, implying weak spatial auto-correlation between samples. Estimating of snow depth and density was performed by using ordinary kriging and spherical model. Cross validation results indicated that kriging could make a precise estimation of snow depth and density due to low variability of snow depth and density and the strong spatial structure of snow depth.

 
Keyword(s): GEOSTATISTICAL ANALYSIS, SNOW DEPTH, SNOW DENSITY, VARIOGRAM, TALEGHAN
 
References: 
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