摘要
根据实测资料,分析了1950年以来龙川江流域气温、降水、水面蒸发和径流等水循环要素的变化情况。结果表明受全球升温的影响,龙川江流域气温和降水量均为较明显的升高和增加趋势,年径流量呈现为非常微弱的减少趋势,而年蒸发量则表现为非常明显的减少趋势。从年代际来看,气温在20世纪80年代以前是偏冷期,80年代以来为偏暖期;蒸发量规律较为明显,自20世纪60年代以来持续减少;20世纪60年代和90年代降水量较丰富,70和80年代相对较少;年径流量的变化与年降水量类似;水循环要素在年内的变化与年代变化趋势同步。对于未来趋势,年均气温有可能转向降低,年降水量转向减少,蒸发量持续减少,径流量则由目前的微弱减少变为明显减少。
According to the weather and hydrological observation data from the gauging stations,the data of temperature,precipitation,surface water evaporation and runoff since 1950s of Longchuanjiang river basin was analyzed in this paper.The results showed that under the impacts of global warming,air temperature and precipitation in Longchuanjiang river basin presented significantly increase and the upward trend,respectively,and the annual runoff presented a very weak decreasing trend,while the annual evaporation presented very clearly decreasing trend.From the decadal time scale,the temperature was colder before the 1980s and was warmer after the 1980s.The rule of evaporation was more obvious,the evaporation continued to decrease since the 1960s.The precipitation was sufficient in the 1960s and 1990s,while it relatively decreased in 1970s and 1980s.The rule of annual runoff was similar to annual precipitation.The annual changing rule of water cycle factors was similar to interannual changing rule.For future trend,the mean annual temperature may shift to decrease,the annual precipitation will shift to reduce,the annual evaporation will continued to decrease,and the runoff will shift to significantly decrease from slightly decrease in the present.
出处
《节水灌溉》
北大核心
2011年第2期1-4,共4页
Water Saving Irrigation
基金
国家自然科学基金-云南省人民政府联合基金重点资助项目(U0933604)
云南省自然科学基金资助项目(2009CD053)
关键词
变化环境
水循环
响应
龙川江流域
changing environment
water cycle
response
Longchuanjiang River Basin
