| Analysis on space-time distribution characteristic and influence of summer drought in Gansu Province during 1961—2015 |
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| DOI：10.7606/j.issn.1000-7601.2017.06.39 |
| Key Words: summer drought the frequency time dynamic the spatial distribution Gansu Province |
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| Abstract: |
| The frequency and the range of yearly summer drought were calculated based on the data of precipitation in spring season (July to August) of 1961—2015 from the 80 meteorological observations in Gansu. A statistical analysis of drought frequency, scope and decadal variability, the following results have been obtained: The frequency of summer drought in Hexi corridor was highest area from 30% to 55%. In the north of Longzhong, Longdong and Longnan regions, the frequency were higher. In the south of Longzhong and Gannan, the frequencies were minimal from 20% to 30%. In Gansu Province, Hexi corridor and Hedong, the frequency of summer drought showed little increasing trend from 3.7% to 5.7%. The range of summer drought showed 0.2% per ten years gradually narrowing from 1961 to 1995, and then expanded trend from 1996 to 2015. There were seven years which drought intensity is greater than moderate drought. Summer drought caused the crops and 1.1% per ten years enlarged the drought-affected area in Gansu Province in 1985 to 2015. |
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