| Distribution characteristics of runoff in Shiyang River basin and its responses to climate change——The case study of Xiying River |
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| DOI：10.7606/j.issn.1000-7601.2013.01.36 |
| Key Words: climate change runoff variation climate factor Shiyang river basin |
| Author Name | Affiliation | | LIU Mingchun | Key Laboratory of Arid Climatic Change and Disaster Reducing of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reducing of CMA/Institute of Arid Meteorology, China Meteorological Administration, Lanzhou, Gansu 730020, China
Wuwei Meteorological Bureau of Gansu Province, Wuwei, Gansu 733000, China | | LI Lingping | Wuwei Meteorological Bureau of Gansu Province, Wuwei, Gansu 733000, China | | SHI Zhijuan | Gansu Provincial Meteorological Bureau, Lanzhou, Gansu 730020, China | | QIN Sanjie | Gansu Provincial Meteorological Bureau, Lanzhou, Gansu 730020, China |
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| Abstract: |
| Based on the runoff observation and meteorological data at Xiying River in the Shiyang River basin during 1961—2009, the change trend and annual distribution of runoff as well as their relationship with meteor
ological factors were analyzed. The results showed that the overall change trend of runoff was going down in the recent 49a, and the decrease range was greater in winter and summer than in spring and autumn. The seasonal runoff decreased ob
viously in 1990s, especially the evident abrupt changes were found in yearly, spring and summer runoff. The annual runoff came mainly from rainwater during flood seasons, and the proportion of rainwater in total runoff was gradually increased, while that of snow melt water in total runoff was decreased. There was a small increasing trend of precipitation in the river basin, but it was not obvious in summer. The temperature increased significantly, and the trend coefficient of temperature was the largest in winter, which caused the increase trend of evapo
ration. Correlative analysis showed that the runoff was positively correlated with the monthly precipitation during June to September, but it was negatively correlated with monthly temperature and evaporation during July to August. The probable influences of future temperature and precipitation changes on runoff under different conditions was also analyzed, which showed that the temperature would play a main negative role on runoff, and the rise of temperature along with the increase of evaporation during flood periods would bring out the decrease of total annual runoff. Climate warming would be unfavorable to the increase of runoff in general. |
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