Monitoring snow-covered areas using NOAA-AVHRR data in the eastern part of Turkey

被引:28
作者
Akyürek, Z [1 ]
Sorman, AÜ [1 ]
机构
[1] Middle E Tech Univ, Dept Civil Engn, Geodet & Geog Informat Technol Div, Water Resources Lab, TR-06531 Ankara, Turkey
来源
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES | 2002年 / 47卷 / 02期
关键词
snowmelt; remote sensing; GIS;
D O I
10.1080/02626660209492927
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
Monitoring snow-covered areas and estimating the snow water equivalent play an important role in predicting discharges during spring months, especially in regions where snow is an important resource. This study has been conducted in the Upper Euphrates River basin, of 10 200 km(2) area, and elevation range of 11253500 in. In estimating snow-covered areas, besides semi-supervised multispectral classification of NOAA-AVHRR data, a theta algorithm, developed by the US National Weather Service, has been used. The two classification techniques were applied to the Advanced Very High Resolution Radiometer (AVHRR) data obtained directly from the satellite receiver located at the university campus in Ankara, Turkey. The corrected images were rectified according to the UTM coordinate system. Snow-covered areas were obtained for cloud-free and partial cloudy images for April 1998 within the project area located in the eastern part of Turkey. Furthermore, the threshold to separate clouds from cloud-free areas is determined. The effects of elevation, aspect, slope and prevailing winds in determining the snow-covered areas for April 1998 are explained and the changes in the snow line are determined considering the effects of these topographic and meteorological factors. Snow depletion curves were obtained by using the proper classification technique for all the other cloud-free and partial cloudy images for 1998. These curves were used with other meteorological parameters as input to a snowmelt runoff model in order to predict the daily discharges, which were compared with the records at the streamgauge of the basin. The effects of aspect and slope on the snow depletion curves for different elevation zones are also shown and, considering this effect, the depletion curves are improved.
引用
收藏
页码:243 / 252
页数:10
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