台兰河流域水文气象要素变化特征分析

根据台兰水文站1957-2010年降水、气温、径流资料，应用多种数理统计法对各水文气象要素的变化趋势进行分析。研究表明：降水量年际变幅增大，但多年平均值基本稳定，总体呈上升趋势；气温以1980年为分界，以前呈显著降低趋势以后有着显著上升趋势，总体气温呈明显的上升趋势；径流表现出较明显的增多趋势，初步判断得出在春季气温是影响径流变化的主导因素，而在夏秋冬季降水与气温共同影响着径流组成。

Variation characteristics analysis of hydrological and meteorological factors in Tailan River basin

Based on the precipitation,air temperature and runoff records out of Tailan Hydrological Station from 1957 to 2010,various hydrological and meteorological factors were analyzed by multiple mathematical statistics methods. The results of analysis demonstrate that precipitation generally had a rising trend with increasing interan-nual change amplitude and basically stable long-time average annual value;air temperature generally had a rising trend with remarkable dropping trend and rising trend before and after 1980 respectively;runoff had notable rising trend. It is preliminarily concluded that air temperature is the dominant factors influencing runoff in spring;while precipitation and air temperature jointly affect the runoff during summer,autumn and winter.