Modis Snowline Elevation Changes During Snowmelt Runoff Events in Europe

Journal of Hydrology and Hydromechanics

Krajčí Pavel¹  Sensoy Aynur²  Molnar Peter³  Jenicek Michal⁴  Rizzi Jonathan⁵  Bezak Nejc⁶  Riboust Philippe⁷  Thirel Guillaume⁷  Viglione Alberto⁸  Parajka Juraj⁸  Mangini Walter⁸  Holko Ladislav⁹  Hundecha Yeshewa^1,10  Burkhart John^1,11  Hauksson Bjarki^1,11 

[1] Avalanche Prevention Centre, Mountain Rescue Service,Liptovsky Hradok, Slovakia;Department of Civil Engineering, Anadolu University,Eskisehir, Turkey;Department of Civil, Environmental and Geomatic Engineering , Institute of Environmental Engineering, ETH Zurich,Zurich, Switzerland;Department of Physical Geography and Geoecology, Charles University,Prague, Czech Republic;Division Forests and Forest Resources, Department Forest and Climate, Norwegian Institute of Bioeconomy Research,Ås, Norway;Faculty of Civil and Geodetic Engineering, University of Ljubljana,Ljubljana, Slovenia;HYCAR Research Unit (HBAN), Irstea, 1 rue Pierre-Gilles de Gennes, CS 10030, 92761Antony Cedex, France;Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology,Vienna, Austria;Institute of Hydrology, Slovak Academy of Sciences,Bratislava, Slovakia;Swedish Meteorological and Hydrological Institute, Folkborgsvägen 17, 601 76,Norrköping, Sweden;The Faculty of Mathematics and Natural Sciences, Department of Geosciences, University of Oslo,Oslo, Norway;

关键词: modis;    snowmelt;    runoff events;    europe;    snowline elevation;   

DOI  :  10.2478/johh-2018-0011

来源: DOAJ

【 摘 要 】

This study evaluates MODIS snow cover characteristics for large number of snowmelt runoff events in 145 catchments from 9 countries in Europe. The analysis is based on open discharge daily time series from the Global Runoff Data Center database and daily MODIS snow cover data. Runoff events are identified by a base flow separation approach. The MODIS snow cover characteristics are derived from Terra 500 m observations (MOD10A1 dataset, V005) in the period 2000-2015 and include snow cover area, cloud coverage, regional snowline elevation (RSLE) and its changes during the snowmelt runoff events. The snowmelt events are identified by using estimated RSLE changes during a runoff event. The results indicate that in the majority of catchments there are between 3 and 6 snowmelt runoff events per year. The mean duration between the start and peak of snowmelt runoff events is about 3 days and the proportion of snowmelt events in all runoff events tends to increase with the maximum elevation of catchments. Clouds limit the estimation of snow cover area and RSLE, particularly for dates of runoff peaks. In most of the catchments, the median of cloud coverage during runoff peaks is larger than 80%. The mean minimum RSLE, which represents the conditions at the beginning of snowmelt events, is situated approximately at the mean catchment elevation. It means that snowmelt events do not start only during maximum snow cover conditions, but also after this maximum. The mean RSLE during snowmelt peaks is on average 170 m lower than at the start of the snowmelt events, but there is a large regional variability.

【 授权许可】

Unknown