Nalenggele River is an inland river located in the arid fragile ecological environment area in northwestern China. Groundwater discharge to the river can largely impact the ecologic environment in Nalenggele River basin but few hydrogeological studies were conducted in the inland arid basin. In this paper, two sections were chosen to analyze the groundwater discharge in the downstream of Nalenggele River. Section I–I′ is located in the west of the downstream of this River while section II–II′ in the east. Two methods were used to calculate the discharge in section I–I′: Darcy's Law and Modflow Simulation. In these two methods, the vertical hydraulic conductivity of the stream sediment is a key parameter, which was determined by a falling-head permeameter test in the river. The results show that the groundwater discharges by the above two methods are very close to the results of previous study by 222Rn mass balance method. This is the first try to use a field test method to get the vertical hydraulic conductivity and the hydraulic gradient, and to illustrate the groundwater discharge in the downstream of Nalenggele River in Northwestern China by classic methods.
- Darcy's law
- falling-head permeameter test
- groundwater discharge
- modflow simulation
- Nalenggele river
- First received 19 November 2015.
- Accepted in revised form 8 September 2016.
- © IWA Publishing 2016