| Analysis of precipitation in Gansu Province based on DEM |
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| DOI：10.7606/j.issn.1000-7601.2009.05.01 |
| Key Words: precipitation DEM Gansu |
| Author Name | Affiliation | | ZHANG Xudong | Lanzhou Institute of Arid Meteorology China Meteorological Administration Key Laboratory of Arid Climatic Change and Reducing Disaster in Gansu Province, Lanzhou, Gansu 730020, China；Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China | | XIN Jiwu | Hainan Meteorological Bureau Haikou, Hainan 570203, China | | WANG Runyuan | Lanzhou Institute of Arid Meteorology China Meteorological Administration Key Laboratory of Arid Climatic Change and Reducing Disaster in Gansu Province, Lanzhou, Gansu 730020, China | | YING Dong | Gansu Meteorological Bureau, Lanzhou, Gansu 730020, China |
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| Abstract: |
| Based on precipitation data of 80 meteorological observation stations in Gansu Province in the latest 30 years (1971～2000) , the geographic information system (GIS) method was used to rasterize the data.The results showed that the mathematic model about precipitation space distribution in the whole province built by the methods of stepwise regression, macro geographical factors simulation and revision of little topographic influence and etc.has the characteristic of less error.The average relative error was 1.5%.The calculated result indicated that the difference of precipitation resources distribution in Gansu Province was very big over a wide range from 100 mm to 800 mm, which displayed a tendency of decreasing mainly from southeast to northwest.The arid area (r<300 mm) was 184 144.01 km2 in Gansu Province, accounting for 46.6% of the province's whole area. |
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