丽江坝区黑龙潭泉群断流特征及流量预测研究

Breaking characteristics and flow forecasting of Heilongtan springs in Lijiang valley area

为探明丽江坝区黑龙潭泉群断流原因并预测泉群退水及出流规律,通过对坝区地形地貌、河流水系及地下水特征等进行研究,采用逐步回归法分析了降水量与黑龙潭泉群年平均流量的关系。结果表明:泉水出流与连续3 a面平均降水量关系密切,流域连续3 a平均降水量小于1100 mm时,黑龙潭泉群将会出现季节性干涸;黑龙潭泉群全年可分为3个退水段,分别为10月至次年1月,1~3月,3~6月;泉群溢出量接近0.2 m^(3)/s时,黑龙潭泉水将逐渐干涸,并出现泉水倒灌现象。

In order to study breaking cause and outflow recession laws of Heilongtan springs in Lijiang valley area,the geomorphology,river system and groundwater in the area were analyzed.The relationship between precipitation and annual average runoff of Heilongtan springs was analyzed by stepwise regression method.The results showed that the spring outflow was closely related to the annual average precipitation for three consecutive years.When the average precipitation was less than 1100 mm for three consecutive years,the Heilongtan Springs will be dry seasonally.The recession of Heilongtan spring group was divided into three periods,i.e.,from October to January,from January to March and from March to June.When the outflow of the spring was close to 0.2 m^(3)/s,the Heilongtan springs would dry up gradually,and spring backflow would appear.