上海嘉定区水文要素变化特征分析

Analysis on Change Characteristic of Hydrologic Features in Jiading District of Shanghai

通过分析上海市嘉定区的水文要素变化特征,表明嘉定区年总降雨量逐年增加,但增加幅度不大,最大24 h降雨量明显增加。年总蒸发量呈现出15 a左右的周期性变化。年平均水位逐年抬升,上涨幅度较大。相关性分析表明,降雨与水位有正相关关系,降雨与蒸发存在负相关关系。通过比较降雨与水位的变化过程,指出年平均水位的抬升主要影响因素不是降雨的增加。

According to the analysis on change characteristic of hydrologic features in Jiading District of Shanghai, it is shown that the annual overall rainfall increases year by year, but the increment range is not great. The maximum 24-h rainfall increases obviously. The annual overall evaporation presents about 15 a periodical change. The annual average water level rises year by year. The rising range is more greatly. The correlation analysis shows that the rainfall has positive correlation with the water level, and the rainfall has negative correlation with evaporation. According to the comparison of the rainfall and water level change process, it is shown that the main influencing factor to uplift the annual average level water is not theincrement of rainfall.