【摘要】 利用1979-2016年金沙江支流漾弓江流域木家桥水文站流量资料和丽江市气象资料,揭示了漾弓江流域径流变化特征及其主要影响因素。研究结果表明:漾弓江流域年径流量呈先增加后减小趋势。在年代际时间尺度, 20世纪80年代、 90年代以及2000-2009年,径流量呈现增加趋势,而2010-2016年径流量呈减小趋势,与2000-2009年相比, 2010-2016年径流量减少了42%(减少径流量为0.88×10~8 m~3)。气温和降水量对径流的影响均较为显著,其中,降水量对径流的影响主要体现在雨季,而气温对径流的影响主要体现在消融期。气温升高导致冰川累积负物质平衡,进而引起冰雪融水变化,漾弓江流域2000-2009年径流变化的主要原因。更多还原

【Abstract】 Based on the runoff data at Mujiaqiao hydrological station of Yanggong River basin and the meteorological data of Lijiang city during the period 1979-2016, this study analyzed the variation of the runoff and its main influencing factors. The results showed that the discharge of the Yanggong River basin exhibited an increasing trend and then decreasing trend during the study period. Though the discharge increased during 1980 s, 1990 s and 2000-2009, the discharge decreased during 2010-2016. The discharge during 2010-2016 decreased by 42%(0.88×10~8 m~3) compared with the average discharge of 2000-2009. Moreover, the correlation analysis showed that precipitation and temperature were the main control factors for the Yanggong River runoff. The influence of precipitation on discharge mainly occurred in rainy season whereas the influence of temperature on discharge mainly occurred in melting season. The variation of snow and ice meltwater caused by the rising temperature resulted in the different change of runoff and precipitation.更多还原