Variation characteristics and influencing factors of potential evapotranspiration in Danjiangkou reservoir area
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Abstract:
Variation characteristics of potential evapotranspiration (ET0) has important significance in water cycle research and water resource assessment in the background of global climate change in Danjiangkou reservoir area. ET0 and dry index (DI) measured by Penman-Monteith model were analyzed based on the measured meteorological data during 1970-2009, which came from the National Meteorological Center public network. The results showed that: 1) Annual precipitation with a mean value of 839.9 mm decreased with the increment of annual series, and the annual, rainy season and dry season precipitation decreased by 14.3, 4.5 and 9.0 mm/10a respectively. 2) Annual ET0 with a mean value of 860.0 mm increased with the increment of annual series, and the annual, rainy season and dry season ET0 increased by 12.2, 10.2 and 2.9 mm/10a respectively. 3) Annual DI with a mean value of 1.07 increased with the increment of annual series, and the annual, rainy season and dry season DI increased by 0.02, 0.17 and 0.31 mm/10a respectively. 4) ET0 and DI had significant negative correlation with relative humid, and significant positive correlation with mean wind speed and sunshine hours. The climate in Danjiangkou reservoir area had a drought trend stem from the decrease of precipitation and increase of ET0 in the recent 40 years.
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