GSFLOW在干旱区地表水与地下水耦合模拟中的应用  

Application of GSFLOW to the modeling of groundwater-surface water interaction in an arid watershed

作　　者：张浩佳[1] 吴剑锋[1] 林锦[2] 吴鸣[1] 吴吉春[1] 

机构地区：[1]南京大学地球科学与工程学院水科学系,南京210023 [2]南京水利科学研究院,南京210029

出　　处：《南京大学学报（自然科学版）》2015年第3期596-603,共8页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金(41030746;41372235)

摘　　要：地表水-地下水具有复杂的相互转换关系,但是相关的地表水-地下水耦合模拟模型应用较少.本文通过分析GSFLOW模型的结构、原理及计算过程等,应用GSFLOW模型对干旱区进行地表水-地下水耦合模拟.根据开都河地区的现有资料,利用GSFLOW模型构建了研究区地表水-地下水耦合模型,并利用2000—2005年两个径流测站数据、地下水观测井数据和博斯腾湖水位数据与模型模拟结果进行比较分析.研究结果表明,模型各个径流测站径流量的Nash模型确定性系数在0.67以上,观测井绝对平均误差约1.2m,开都河东支模拟出流量和博斯腾湖水位变化的趋势相近,取得较好的模拟精度.GSFLOW模型可以较为真实反应出地表水-地下水相互作用的影响及河流径流量的变化,可以作为类似干旱区地表水-地下水相互作用的评估工具,并应用于实际地表水-地下水资源的统一管理.Due to the complexity of the groundwater-surface water interaction,the coupled surface water and groundwater flow simulation model is seldom used in arid watersheds.This paper reviews the several existing methods for coupling the surface water and groundwater simulations.Then this paper introduces the GSFLOW model in terms of its structure,principle and calculation process and uses it for modeling the interaction between the surface water and groundwater in an arid watershed.According to the existing data and conditions in the Kaidu River basin,the coupled surface water and groundwater flow model is constructed using GSFLOW and GIS tools.Also,the model is calibrated and validated by using the observation data of runoff,groundwater and surface water levels of Bositeng Lake from^2000 to 2005.The results show that the Nash coefficient for runoff simulations is over 0.67,the absolute averagederror between the observed and simulated groundwater level is about 1.2m,and the trend of the water level of Bositeng Lake is in agreement with the runoff of Kaidu River,indicating that the model achieves satisfying simulation accuracy.This paper shows that the GSFLOW model is a helpful tool for assessing the groundwater-surface water interaction and can be used for integrated management of surface water and groundwater resources in arid watersheds.

关 键 词：地表水 地下水 耦合模拟 GSFLOW 

分 类 号：P333.9[天文地球—水文科学]