水文与水量分配报告第六章英文翻译.docx

6. Analysis on the change trend of water in project areaAnalysis of the changes of the annual precipitation process in project area1. For the analysis of climate change impacts on precipitation in project area, the project counties collected a series of observed data of precipitation, runoff, temperature, evaporation.2. Considering the Shouguang City meteorological data series is longer, there is observed data of precipitation, runoff, temperature, evaporation in 1959-2012, meteorological data is integral, so analyse the influence of climate change on precipitation, water of Shouguang since 1959.3. Shouguang county rainfall station during 1959 -2012, the multi-year mean precipitation is 595.3mm, the annual maximum precipitation of 1964 is 1286.7mm, the annual minimum precipitation of 1977 is 330.2mm. The annual maximum rainfall is about 3.9 times of the annual minimum precipitation. As shown in figure 6-1:Figure 6-1: The change of precipitation process in Shouguang City’s rainfall station since 1960 Assessment of the Change of multi-year mean monthly precipitation, evaporation 4. 1959-2012 years, the precipitation of multi-year average in flood season 6-9 month accounted for 73% of annual average precipitation in Shouguang City. In July and August , 2 months’ precipitation accounts for about 50% of annual average precipitation.5. The distribution situation of multi-year average monthly evaporation is similar as multi-year average monthly precipitation in Shouguang, but the maximum monthly evaporation appeared in June, less monthly evaporation appeared in May, followed in April. This is a crop seedling early growth period, the ground cover is not strict, crop water requirement is larger but smaller monthly precipitation, the contradiction between precipitation and requirement is more prominent, as shown in figure 6-2.Figure 6-2: Shouguang City multi-year mean monthly evaporation accounted for the proportion of annual evaporationEffect of temperature on the precipita