A modification of the finite-difference model for simulation of two dimensional ground-water flow to include surface-ground water relationships

Ozbilgin, Melih M.; Dickerman, David C.

doi:10.3133/wri834251

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…The in/out flow is calculated by multiplying the head difference between the stream and the aquifer by the riverbed conductance. The stream level is calculated on every reach downstream to the first reach through Manning's equation for open channels (Ozbilgin and Dickerman 1984), while the conductance is derived from the riverbed dimensions (width and thickness) and permeability.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Impacts of a railway tunnel on the streams baseflow verified by means of numerical modelling

Piccinini

Vincenzi²

2021

AS-ITJGW

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The high-speed railway line between Bologna and Florence (Italy) is mostly developed underground through the Tuscan-Emilian Apennine, and the tunnels severely impacted groundwater and surface water. The 15-km-long Firenzuola tunnel crosses siliciclastic turbidites: during drilling, water inrushes occurred at fault and fracture zones, and the tunnel continues to drain the aquifer. The water table dropped below the level of the valleys, and gaining streams transformed into losing streams or ran completely dry, as did many springs. Hydrological observations and two multitracer tests have previously characterized the stream-tunnel connections and the impact processes. In the framework of planning mitigation strategies to minimize impacts on stream baseflow, three-dimensional numerical modelling with MODFLOW (the EPM approach) is applied to evaluate the artificial minimum flow needed to maintain flow continuity along the stream during the recession phase. The establishment of the two presented models is based on hydrogeological monitoring data and the results of flow measurements and tracer tests. Maximum flow rates subtracted from stream baseflow by the tunnel along the connection structures are calculated for two streams with major impacts.

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Section: Boundary Conditionsmentioning

confidence: 99%

Impacts of a railway tunnel on the streams baseflow verified by means of numerical modelling

Piccinini

Vincenzi²

2021

AS-ITJGW

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Comparison of the MODFLOW modules for the simulation of the river type boundary condition

Dušek

Velísková

2017

Pollack Periodica

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The aim of this article is the comparison of input options of river boundary condition of MODFLOW-three-dimensional numerical simulation model of groundwater flow. The water level in stream flowing through territory of hydrogeological layer can be computed via three built-in modules: River, Stream and Streamflow-Routing. In this study the code MODFLOW is used to simulate idealized aquifer and stream. The differences between computed groundwater table showed to be minimal, thus in case of modules Stream and Streamflow-Routing they are equally usable as using module River with external one or two-dimensional simulation of surface water flow, which is more time-consuming process. However, this applies only to idealized, simplified conditions of the modeled environment. For more complex simulation of flow in streams with irregular structure of the streambed is necessary to use either an external simulation or use the Streamflow-Routing module, which includes the possibility to enter more complex hydraulic flow parameters in the model.

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Documentation of a computer program to simulate stream-aquifer relations using a modular, finite-difference, ground-water flow model

Prudic¹

1989

Open-File Report

270

265

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Computer models are widely used to simulate ground-water flow for evaluating and managing the ground-water resources of many aquifers, but few are designed to also account for surface flow in streams. A computer program was written for use in the U.S. Geological Survey modular finitedifference ground-water flow model to account for the amount of flow in streams and to simulate the interaction between surface streams and ground water. The new program is called the Streamflow-Routing Package.The Streamf low-Routing Package is not a true surface-water flow model but rather is an accounting program that tracks the flow in one or more streams which interact with ground water. The program limits the amount of ground-water recharge to the available streamflow. It permits two or more streams to merge into one with flow in the merged stream equal to the sum of the tributary flows. The program also permits diversions from streams.Streams are divided into segments and reaches. Each reach corresponds to individual cells in the finite-difference grid used to simulate groundwater flow. A segment consists of a group of reaches connected in downstream order. Leakage is calculated for each reach on the basis of the head difference between the stream and aquifer and a conductance term. It is subtracted or added to the amount of streamflow into the reach. The stage in each reach can be computed using the Manning formula under the assumption of a rectangular stream channel.The amount of leakage in each reach (either into or out of the aquifer) is incorporated into the ground-water flow model by adding terms to the finite-difference equations. Recharge to the aquifer in a reach ceases when all the streamflow in upstream reaches has leaked into the aquifer and the stream is dry. A stream is permitted to flow again in downstream reaches if the head in the aquifer is above the elevation of the streambed.Results from the program have been compared to results from two analytical solutions. One assumes time varying areal recharge to the aquifer and discharge only to a stream and the other assumes recharge to the aquifer from a change in stream stage. Results from the program reasonably duplicated the analytical solutions.

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A modification of the finite-difference model for simulation of two dimensional ground-water flow to include surface-ground water relationships

Cited by 5 publications

References 2 publications

Impacts of a railway tunnel on the streams baseflow verified by means of numerical modelling

Impacts of a railway tunnel on the streams baseflow verified by means of numerical modelling

Comparison of the MODFLOW modules for the simulation of the river type boundary condition

Documentation of a computer program to simulate stream-aquifer relations using a modular, finite-difference, ground-water flow model

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