Three-dimensional analysis of future groundwater flow conditions and contaminant plume transport in the Hanford Site unconfined aquifer system: FY 1996 and 1997 status report

Abstract Randublatung groundwater basin is one of the groundwaters basins with massive utilization of groundwater pumping. However, the knowledge of the comprehensive hydrogeological system in this groundwater basin is limited, so this research aims to determine a comprehensive hydrogeological conceptual model of the Randublatung groundwater basin. The methodology was conducted by collecting secondary and primary data of deep and shallow wells to evaluate boundaries of pattern and direction of groundwater flow and develop the aquifer system’s geometry. The result shows that the groundwater flow boundaries are Grogol River in the west, Wado River in the East, Bengawan Solo river in the South as a river boundary, and Rembang Mountains in the North as a constant head boundary. Therefore, groundwater flows from the hills area to the Bengawan Solo River and the north as the river’s flow. Based on the log bor evaluation, the aquifer system of the study area consist of an unconfined aquifer with a maximum thickness of 20 m and three layers of confined aquifers with thickness vary between 8 to 60 m. the hydraulic conductivity of the aquifers depends on the aquifer’s lithology range from sand, gravel, limestone, and sandstone. This hydrogeological conceptual model provides essential information for numerical groundwater models in the middle of the Randublatung groundwater basin.

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Approximate analysis of three-dimensional groundwater flow toward a radial collector well in a finite-extent unconfined aquifer

Hydrology and Earth System Sciences ◽

10.5194/hess-20-55-2016 ◽

2016 ◽

Vol 20 (1) ◽

pp. 55-71 ◽

Cited By ~ 8

Author(s):

C.-S. Huang ◽

J.-J. Chen ◽

H.-D. Yeh

Keyword(s):

Groundwater Flow ◽

Integral Transform ◽

Three Dimensional ◽

Vertical Component ◽

Hydraulic Head ◽

Unconfined Aquifer ◽

Specific Yield ◽

Specific Storage ◽

Sink Term ◽

Radial Collector Well

Abstract. This study develops a three-dimensional (3-D) mathematical model for describing transient hydraulic head distributions due to pumping at a radial collector well (RCW) in a rectangular confined or unconfined aquifer bounded by two parallel streams and no-flow boundaries. The streams with low-permeability streambeds fully penetrate the aquifer. The governing equation with a point-sink term is employed. A first-order free surface equation delineating the water table decline induced by the well is considered. Robin boundary conditions are adopted to describe fluxes across the streambeds. The head solution for the point sink is derived by applying the methods of finite integral transform and Laplace transform. The head solution for a RCW is obtained by integrating the point-sink solution along the laterals of the RCW and then dividing the integration result by the sum of lateral lengths. On the basis of Darcy's law and head distributions along the streams, the solution for the stream depletion rate (SDR) can also be developed. With the aid of the head and SDR solutions, the sensitivity analysis can then be performed to explore the response of the hydraulic head to the change in a specific parameter such as the horizontal and vertical hydraulic conductivities, streambed permeability, specific storage, specific yield, lateral length, and well depth. Spatial head distributions subject to the anisotropy of aquifer hydraulic conductivities are analyzed. A quantitative criterion is provided to identify whether groundwater flow at a specific region is 3-D or 2-D without the vertical component. In addition, another criterion is also given to allow for the neglect of vertical flow effect on SDR. Conventional 2-D flow models can be used to provide accurate head and SDR predictions if satisfying these two criteria.

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Three-dimensional numerical simulation of fully coupled groundwater flow and land deformation due to groundwater pumping in an unsaturated fluvial aquifer system

Journal of Hydrology ◽

10.1016/j.jhydrol.2006.09.031 ◽

2007 ◽

Vol 335 (1-2) ◽

pp. 1-14 ◽

Cited By ~ 38

Author(s):

Jung-Hwi Kihm ◽

Jun-Mo Kim ◽

Sung-Ho Song ◽

Gyu-Sang Lee

Keyword(s):

Numerical Simulation ◽

Groundwater Flow ◽

Three Dimensional ◽

Groundwater Pumping ◽

Aquifer System ◽

Land Deformation ◽

Fluvial Aquifer ◽

Fully Coupled

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Analysis of three-dimensional groundwater flow toward a radial collector well in a finite-extent unconfined aquifer

Hydrology and Earth System Sciences Discussions ◽

10.5194/hessd-12-7503-2015 ◽

2015 ◽

Vol 12 (8) ◽

pp. 7503-7540 ◽

Cited By ~ 1

Author(s):

C.-S. Huang ◽

J.-J. Chen ◽

H.-D. Yeh

Keyword(s):

Groundwater Flow ◽

Integral Transform ◽

Three Dimensional ◽

Vertical Component ◽

Hydraulic Head ◽

Unconfined Aquifer ◽

Specific Yield ◽

Specific Storage ◽

Sink Term ◽

Radial Collector Well

Abstract. This study develops a three-dimensional mathematical model for describing transient hydraulic head distributions due to pumping at a radial collector well (RCW) in a rectangular confined or unconfined aquifer bounded by two parallel streams and no-flow boundaries. The governing equation with a point-sink term is employed. A first-order free surface equation delineating the water table decline induced by the well is considered. The head solution for the point sink is derived by applying the methods of double-integral transform and Laplace transform. The head solution for a RCW is obtained by integrating the point-sink solution along the laterals of the RCW and then dividing the integration result by the sum of lateral lengths. On the basis of Darcy's law and head distributions along the streams, the solution for the stream depletion rate (SDR) can also be developed. With the aid of the head and SDR solutions, the sensitivity analysis can then be performed to explore the response of the hydraulic head to the change in a specific parameter such as the horizontal and vertical hydraulic conductivities, streambed permeability, specific storage, specific yield, lateral length and well depth. Spatial head distributions subject to the anisotropy of aquifer hydraulic conductivities are analyzed. A quantitative criterion is provided to identify whether groundwater flow at a specific region is 3-D or 2-D without the vertical component. In addition, another criterion is also given to allow the neglect of vertical flow effect on SDR. Conventional 2-D flow models can be used to provide accurate head and SDR predictions if satisfying these two criteria.

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