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Study of Snow Cover Dynamics in Upstream Area of Heihe River Using Time Series MODIS Data (2002–2012)
Poster Presentation
Prepared by Y. Bi1, H. Xie2
1 - University of Texas at San Antonio, 422 Mahogany Chest, San Antonio, Texas, 78249
2 - University of Texas at San Antonio, One UTSA Circle, San antonio, TEXAS, 78249
Contact Information: biyunbo@gmail.com; 210-287-5709
ABSTRACT
Snow cover is an important water source of major Asian rivers and greatly influences water availability in the downstream areas. In this study, snow cover dynamics of the upstream areas of Heihe River in the northwestern China during hydrological years 2002–2012 (September through August) are examined using the flexible multiday combined MODIS snow cover products. The time series of multiday, seasonal, and annual snow covered area (SCA), snow covered days (SCD), peaks of maximum SCA, and snow cover index (SCI) for each hydrological year (HY) are examined. Results show that the HY2008 had the greatest snow cover distribution and HY2003 had the smallest. Temperature data from A’rou freeze/thaw observation station is used to represent the low valley temperature and temperature data from Yeniugou cold region hydrological station are used to represent the high mountains temperature in upstream area of Heihe River. The deseasonal temperature data and snow cover data showed high correlation (r=0.89, p<0.01) with the SCA data in a 76 days lag. To investigate the influence of the snow cover dynamics, we will further examine the interrelation between SCA and runoff in the region.
(Related Session: Academic Research Topics in Environmental Measurement and Monitoring)
Poster Presentation
Prepared by Y. Bi1, H. Xie2
1 - University of Texas at San Antonio, 422 Mahogany Chest, San Antonio, Texas, 78249
2 - University of Texas at San Antonio, One UTSA Circle, San antonio, TEXAS, 78249
Contact Information: biyunbo@gmail.com; 210-287-5709
ABSTRACT
Snow cover is an important water source of major Asian rivers and greatly influences water availability in the downstream areas. In this study, snow cover dynamics of the upstream areas of Heihe River in the northwestern China during hydrological years 2002–2012 (September through August) are examined using the flexible multiday combined MODIS snow cover products. The time series of multiday, seasonal, and annual snow covered area (SCA), snow covered days (SCD), peaks of maximum SCA, and snow cover index (SCI) for each hydrological year (HY) are examined. Results show that the HY2008 had the greatest snow cover distribution and HY2003 had the smallest. Temperature data from A’rou freeze/thaw observation station is used to represent the low valley temperature and temperature data from Yeniugou cold region hydrological station are used to represent the high mountains temperature in upstream area of Heihe River. The deseasonal temperature data and snow cover data showed high correlation (r=0.89, p<0.01) with the SCA data in a 76 days lag. To investigate the influence of the snow cover dynamics, we will further examine the interrelation between SCA and runoff in the region.
(Related Session: Academic Research Topics in Environmental Measurement and Monitoring)