淮河上游气候变化趋势及对水文的影响分析

his paper analyzed variation characteristics of precipitation in the sub-basin along the main stem of the upper Huai River above Xixian gauge station based on the data of 63 precipitation stations in the past 45 years by methods of Mann-Kendall test and wavelets. The result revealed that: annual precipitation series decreased slowly in the past 45 years， and interannual changed greatly； annual precipitation series had significant periodic variation. Precipitation series increased slowly in wet season but decreased obviously in dry season， which might cause water stress and water resources shortage； The precipitation trends were basically the same both to the north and south of the upper Huai River Basin in the wet season， but in dry season the south decreased more significant than the north. There were slight differences for the interdecadal changes in the distribution for the year， the maximum percentage were all in July and had no moving. The annual precipitation is greater， the more uneven distribution during the year. The output of this paper could provides a valuable reference for the development， utilization， planning and management of water resources in the Huai river basin.