| Characteristics of temporal and spatial variation of precipitation in Haihe River Basin during recent 50 years |
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| DOI：10.7606/j.issn.1000-7601.2012.02.41 |
| Key Words: Haihe River Basin precipitation temporal and spatial variation M-K |
| Author Name | Affiliation | | WANG Lina | State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Hebei University of Engineering, Handan, Hebei 056038, China | | ZHU Houhua | State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Water Resources Management Center, Chinese Ministry of Water Resources, Beijing 100053, China | | LU Fan | State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | HE Lixin | Hebei University of Engineering, Handan, Hebei 056038, China |
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| Abstract: |
| According to the precipitation data of Haihe River Basin during 1960—2010, the Tyson polygon is applied in the study to distribute the precipitation in every station of the whole basin. The Kendall tilt is calculated with the M-K and the characteristics of spatial and temporal variation of precipitation in the area is analysed. The results show that the overall precipitation is decreasing in time. Although the precipitation is increasing in spring, there is still very little rain. The variation of precipitation in summer is slow and the frequency of drought is relatively small. The precipitation in aut
umn is gradually decreasing and the drought level is similar to that of spring. There are no significant changes of precipitation and the level of precipitation is extremely little in winter. Besides, the continuous rainless phenomenon occurs in the period from spring to summer, or from autumn to winter, or even consecutively for four seasons. In space, the annual precipitation of the whole basin is gradually decreasing from south to North. Significant changes have taken place in Wutai Mountains and Tianjin in spring. The precipitation in the basin is increasing in summer, especially in the southwest part of Bohai area. It is decreasing significantly in the midle and east part of the whole basin. The precipitation is increasing in winter and the downtrend is slow in the whole basin. |
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