HR: 1340h
AN: H33D-1607    [Abstracts]
TI: Numerical Modeling Study For Saltwater Intrusion On Sand Tank Experiment
AU: * Park, H
EM: crazy098@nate.com
AF: University of Suwon, Department of Civil Engineering University of Suwon, Suwon, 445-743, Korea, Republic of
AU: Kim, J
EM: isindaiko@naver.com
AF: University of Suwon, Department of Civil Engineering University of Suwon, Suwon, 445-743, Korea, Republic of
AU: Ho, J
EM: jayho@unm.edu
AF: University of New Mexico, Department of Civil Engineering University of New Mexico MSC10 1070, Albuquerque, NM 87131-0001, United States
AU: Ahn, W
EM: wsan@suwon.ac.kr
AF: University of Suwon, Department of Civil Engineering University of Suwon, Suwon, 445-743, Korea, Republic of
AB: Saltwater intrusion on freshwater in sand tank was investigated with a numerical model. Groundwater level changes due to a difference of density between freshwater and saltwater were simulated and compared with the laboratory physical model results. Two-dimensional porous media model was developed to compute steady state pressure head using a commercially available finite element based computation code. In this model, the Brinkman equations were adopted for momentum transport through pressure gradients in porous media and through viscous effects, which is not able to consider with Darcy's law. A 25 cm thickness of porous media reproduces the laboratory test aquifer, 192 cm long, 160 cm wide and 53 cm high, composed of well-sorted medium sand (D50 = 0.47 mm). For the model flow boundary condition, a stagnation pressure head boundary was set for both left side and right side of the domain (x-direction). The stagnation pressure boundary condition, which gives constant pressure head and zero lateral velocity (u = 0) at the boundary, reproduces a saltwater providing reservoir. Atmospheric pressure boundary and no-slip wall condition were assigned at the top and the bottom of the domain (y-direction), respectively. Freshwater was recharged at the center of the porous media filled with saltwater. After the groundwater flow reaches to an equilibrium state, the interface water level and the freshwater-lens was observed. Groundwater withdrawal scenarios were tested to access the effect of groundwater pumping on the saltwater intrusion. Scavenger-well, commonly used to control saltwater-wedge, was tested for development of the groundwater contamination relief. The numerical model computations showed positive agreement with the physical model measurements. With the verified numerical model, various pumping rates of groundwater withdrawal scenarios were simulated to investigate relationship between the pumping rate and the saltwater level change. This modeling study will provide valuable information to predict a groundwater system development induced by saltwater intrusion.
DE: 1828 Groundwater hydraulics
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 4255 Numerical modeling (0545, 0560)
SC: Hydrology [H]
MN: 2007 Fall Meeting