中文摘要：

小流域基流计算结果可反映流域地下水与地表水之间的相互影响。对2007年中山大学珠海滨海水循环综合实验基地上游流域做退水分析,并采用不同方法分割上游河道流量过程线,得到的基流BFI值,即基流量除以河川径流量,变化范围在0.43～0.86,旱季BFI最大值为0.96,雨季最小值为0.41。收集研究区域河道水、地下水以及雨水水样分析D、18O同位素值,根据同位素平衡原理采用二水源过程线分割法计算2～5月流域基流比重,得到上游BFI值0.737、下游BFI值0.68,计算结果与改进的数字滤波法3的计算结果相一致。

英文摘要：

Base flow in the small coastal basin could provide an insight to the interaction of surface water and groundwater.Its separation in the case study basin inside Zhuhai Campus of Sun Yatsen University showed the varied BFIs,defined as the volume of base flow divided by the volume of total stream flow with different methods.The BFI value fell into a range of 0.43-0.86 for the whole year of 2007 with a maximum of 0.96 in the dry season from November to March,and a minimum of 0.41 in the rainy season from April to October.Isotopic features of river water,groundwater and rainwater were used to verify the separation,yielding a similar BFI value of 0.737 in the upper reach and 0.68 in the lower reach during the period from February to May as that by the 3rd digital filter method.