Numerical modeling of groundwater flow and analysis of water budget in Nebraska Sand Hills, USA
-
摘要: 利用地下水数值模型MODFLOW和非饱和带水平衡模型对处于半干旱半湿润沙丘地区(Sand Hills)地下水位进行了模拟,并分析了含水层补排水量,河流与地下水补排关系,以及区域水平衡过程。揭示了独特沙丘地形和土壤特性对地下水补排量的影响。模拟结果表明,入渗率大、非饱和带厚的沙丘有利于降水入渗补给,减少了地下水蒸散发损失。加上下覆含水层具有良好的地下水储水空间,是该地区储存丰富的地下水量,以维持河流稳定流量,供给众多湖泊和湿地的原因。该研究对我国地下水资源评价和生态环境脆弱地区水资源保护具有指导意义。Abstract: Numerical simulation of groundwater flow in the semiarid and semi humid climate of the Nebraska Sand Hills was made using the MODFLOW and the water balance model in the unsaturated zone.Analysis of groundwater recharge and dis charge and water balance in the aquifer reveal influences of unique topography of the sand dunes and soil property on ground water recharge and discharge.The simulation results demonstrate that the large infiltration rate of the sand soil results in much precipitation recharging into the aquifer,and thick unsaturated zone reduces groundwater evaporation losses.Therefore,sufficient groundwater could be stored in the thick aquifer,which maintains a steady streamflow and supplies numerous lakes and wet lands.This study is beneficial for groundwater resources evaluation and water resources protection in the environmentally vulnerable area of our country.
-
-
[1] Bleed A,Flowerday C.An atlas of the Sand Hills:Lincoln,Nebraska,Conservation and Survey Division[M].Nebraska:University of Nebraska,1989,67-92. [2] Drda S.Hydrology of two interdunal valleys in the Nebraska Sand Hills[D].Nebraska:University of Nebraska-Lincoln,1998.1-89. [3] Harbaugh A W,Banta R E,Hill M C,et al.MODFLOW-2000,The U.S.Geological Survey modular ground-water model-user guide to modularization concepts and the ground-water flow process[R].Denver:U S Geological Survey Open-File Report 00-92,2000. [4] Cosby B J,Hornberger G M,Clapp R B,et al.A statistical exploration of the relationships of soil moisture characteristics to the physical properties of soils[J].Water Resour Res,1984,20:682-690. [5] Bleed A,Flowerday C.An atlas of the Sand Hills:Lincoln,Nebraska,Conservation and Survey Division[M].Nebraska:University of Nebraska,1989,93-114. [6] Ginsberg M H.Water-budget model of the south-central sand hills of Nebraska[D].Nebraska:University of Nebraska-Lincoln,1987.
计量
- 文章访问数: 181
- HTML全文浏览量: 30
- PDF下载量: 590
下载:
