HESS Hydrology and Earth System Sciences HESS Hydrol. Earth Syst. Sci. 1607-7938 Copernicus Publications Göttingen, Germany 10.5194/hess-14-901-2010 Assessing the application of a laser rangefinder for determining snow depth in inaccessible alpine terrain Hood J. L. 1 Hayashi M. 1 Geoscience University of Calgary, 2500 University Dr., NW, Calgary, AB T2N 1N4, Canada 04 06 2010 14 6 901 910 Copyright: © 2010 J. L. Hood 2010 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://hess.copernicus.org/articles/14/901/2010/hess-14-901-2010.html The full text article is available as a PDF file from https://hess.copernicus.org/articles/14/901/2010/hess-14-901-2010.pdf

Snow is a major contributor to stream flow in alpine watersheds and quantifying snow depth and distribution is important for hydrological research. However, direct measurement of snow in rugged alpine terrain is often impossible due to avalanche and rock fall hazard. A laser rangefinder was used to determine the depth of snow in inaccessible areas. Laser rangefinders use ground based light detection and ranging technology but are more cost effective than airborne surveys or terrestrial laser scanning systems and are highly portable. Data were collected within the Opabin watershed in the Canadian Rockies. Surveys were conducted on one accessible slope for validation purposes and two inaccessible talus slopes. Laser distance data was used to generate surface models of slopes when snow covered and snow-free and snow depth distribution was quantified by differencing the two surfaces. The results were compared with manually probed snow depths on the accessible slope. The accuracy of the laser rangefinder method as compared to probed depths was 0.21 m or 12% of average snow depth. Results from the two inaccessible talus slopes showed regions near the top of the slopes with 6–9 m of snow accumulation. These deep snow accumulation zones result from re-distribution of snow by avalanches and are hydrologically significant as they persist until late summer.

 References Allwardt, P. F., Bellahsen, N., and Pollard, D. D.: Curvature and fracturing based on global positioning system data collected at sheep mountain anticline, Wyoming, Geosphere, 3, 408–421, 2007. Cline, D. W., Bales, R. C., and Dozier, J.: Estimating the spatial distribution of snow in mountain basins using remote sensing and energy balance modeling, Water Resour. Res., 34, 1275–1285, 1998. Corripio, J. G.: Snow surface albedo estimation using terrestrial photography, Int. J. Remote Sens., 25, 5705–5729, 2004. Deems, J. S., Fassnacht, S. R., and Elder, K. J.: Fractal distribution of snow depth from lidar data, J. Hydrometeorol., 7, 285–297, 2006. Derksen, C., Brown, R., Walker, A., and Brasnett, B.: Comparison of model, snow course, and passive microwave derived snow water equivalent data for Western North America, 59th&nbsp;Eastern Snow Conference: Stowe, Vermont, 203–213, 2002. Dozier, J. and Painter, T. H.: Multispectral and hyperspectral remote sensing of alpine snow properties, Annu. Rev. Earth Pl. Sc., 32, 465–494, 2004. Dressler, K. A., Fassnacht, S. R., and Bales, R.: A comparison of snow telemetry and snow course measurements in the Colorado River basin, J. Hydrometeorol., 7, 705–712, 2006. Elder, K., Dozier, J., and Michaelsen, J.: Snow accumulation and distribution in an alpine watershed, Water Resour. Res., 27, 1541–1552, 1991. Fassnacht, S. and Deems, J. S.: Measurement sampling and scaling for deep montane snow depth data, Hydrol. Process., 20, 829–838, 2006. Flerchinger, G., Cooley, K., and Ralston, D.: Groundwater response to snowmelt in a mountainous watershed, J. Hydrol., 133, 293–311, 1992. Foster, J. L., Sun, C., Walker, J. P., Kelly, R., Chang, A., Dong, J., and Powell, H.: Quantifying the uncertainty in passive microwave snow water equivalent observations, Remote Sens. Environ., 94, 187–203, 2005. Hopkinson, C., Demuth, M. N., Sitar, M., and Chasmer, L. E.: Mapping the spatial distribution of snowpack depth beneath a variable forest canopy using airborne laser altimetry, 58th&nbsp;Eastern Snow Conference, Ottawa, Ontario, Canada, 249–253, 2001. Ide, T. S., Pollard, D. D., and Orr Jr., F. M.: Fissure formation and subsurface subsidence in a coalbed fire, Int. J. Rock Mech. Min., 47, 81–92, 2010. Ingesand, H.: Metrological aspects in terrestrial laser-scanning technology, in: Proceedings of the 3rd&nbsp;International Association of Geology/12th&nbsp;International Federation of Surveyors Symposium, Baden, Austria. 2006 Kattelmann, R. and Elder, K.: Hydrologic characteristics and water balance of an alpine basin in the Sierra Nevada, Water Resour. Res., 37(7), 1553–1562, 1991. Křemen, T., Koska, B., and Pospíšil, J.: Verification of laser scanning systems quality, in: Proceedings 23rd&nbsp;International Federation of Surveyors Congress, Munich, Germany, 2006. Lasercraft: Contour XLRic Operator's Manual, LaserCraft Inc., Norcross, GA, 2007. Lewicki, J. L., Hilley, G. E., Tosha, T., Aoyagi, R., Yamamoto, K., and Benson, S. M.: Dynamic coupling of volcanic Co<sub>2</sub> flow and wind at the Horseshoe Lake tree kill, Mammoth mountain, California, Geophys. Res. Lett., 34, L03401, https://doi.org/10.1029/2006GL028848, 2007. Lickorish, W. H. and Simony, P. S.: Evidence for late rifting of the Cordilleran margin outlined by stratigraphic division of the Lower Cambrian Gog group, Rocky Mountain main ranges, British Columbia and Alberta, Can. J. Earth Sci., 32, 860–874, 1995. Liston, G. E. and Elder, K.: A distributed snow-evolution modeling system (Snowmodel), J. Hydrometeorol., 7, 1259–1276, 2006. Pomeroy, J., Essery, R., and Toth, B.: Implications of spatial distributions of snow mass and melt rate for snow-cover depletion: Observations in a subarctic mountain catchment, Ann. Glaciol., 38, 195–201, 2004. Prokop, A.: Assessing the applicability of terrestrial laser scanning for spatial snow depth measurements, Cold Reg. Sci. Technol., 54, 155–163, 2008. Prokop, A., Schirmer, M., Rub, M., Lehning, M., and Stocker, M.: A comparison of measurement methods: Terrestrial laser scanning, tachymetry and snow probing for the determination of the spatial snow-depth distribution on slopes, Ann. Glaciol., 49, 210–216, 2008. Rosenthal, W. and Dozier, J.: Automated mapping of montane snow cover at subpixel resolution from the Landsat thematic mapper, Water Resour. Res., 32, 115–130, 1996. Schaffhauser, A., Adams, M., Fromm, R., Jorg, P., Luzi, G., Noferini, L., and Sailer, R.: Remote sensing based retrieval of snow cover properties, Cold Reg. Sci. Technol., 54, 164–165, 2008. St.&nbsp;Clair, C. C. and Forrest, A.: Impacts of vehicle traffic on the distribution and behaviour of rutting elk, <i>Cervus elaphus</i>, Behavior, 146, 393–413, 2009. Trujillo, E., Ramirez, J. A., and Elder, K. J.: Topographic, meteorologic, and canopy controls on the scaling characteristics of the spatial distribution of snow depth fields, Water Resour. Res., 43, 1575–1590, 2007. Trujillo, E., Ramirez, J. A., and Elder, K. J.: Scaling properties and spatial organization of snow depth fields in sub-alpine forest and alpine tundra, Hydrol. Process., 23, 1575–1590, 2009. Zierl, B. and Bugmann, H.: Global change impacts on hydrological processes in alpine catchments, Water Resour. Res., 41, W02028, https://doi.org/10.1029/2004WR003447, 2005.