Analysis of Precipitation Variation in the Heihe River in Recent 50 Years
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Abstract:
The Heihe River Basin is the second largest inland river basin in northwestern China, and its middle reach area has gentle terrain slope and abundant water resources for the operation of reservoirs. Moreover, the river basin is one of the grain and vegetable production bases in western China. Under climate change, the rainfall pattern changed to some extent in the river basin. In this paper, the daily precipitation data of 15 meteorological sites in the Heihe River Basin and the surrounding area from 1960 to 2010 and the national 1:250,000 DEM data were used to analyze the variation characteristics of precipitation in the plain and hilly area of Heihe River Basin. The results showed that (1) there is less precipitation in the plain region but more in the mountain area, and the overall precipitation has increased with most of which occurs in the mountain area; (2) the precipitation centroids of the mountain and plain area move to the southwest and it is more obvious in the mountainous area; and (3) the wide distribution of 0-100 mm precipitation decreases while the less distribution of 300 mm precipitation increases.
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