Results 251 to 260 of about 15,737 (297)

MODFLOW‐NWT: Robust Handling of Dry Cells Using a Newton Formulation of MODFLOW‐2005

Groundwater, 2012
Introduction The first versions of the widely used groundwater flow model MODFLOW (McDonald and Harbaugh 1988) had a sure but inflexible way of handling unconfined finite-difference aquifer cells where the water table dropped below the bottom of the cell—these “dry cells” were turned inactive for the remainder of the simulation.
Randall J. Hunt, Daniel T. Feinstein
openaire   +2 more sources

Efficient Storage of Large MODFLOW Models

Groundwater, 2013
AbstractWe present a methodology for storing the bulkier portions of a set of MODFLOW input and output files in a compressed binary format using the HDF5 library. This approach results in compression ratios of up to 99% with no significant time penalty.
Norman Jones, Michael J. Kennard, Alan Lemon   +2 more
openaire   +3 more sources

Development and Application of the Integrated GIS-MODFLOW Model [PDF]

, 2020
Water scarcity is the major problem faced by today’s world. Groundwater is the most valuable resource of drinking water due to the scarcity of good quality surface water. Groundwater occurs in hard rock layers whose thickness may vary from few meters to 100 m. Aquifer stores the groundwater and yielded the water at the time of pumping.
Padam Jee Omar, Shishir Gaur, S. B. Dwivedi, Prabhat Kumar Singh Dikshit   +3 more
openaire   +1 more source

MODFLOW‐Style Parameters in Underdetermined Parameter Estimation

Groundwater, 2011
In this article, we discuss the use of MODFLOW‐Style parameters in the numerical codes MODFLOW_2005 and MODFLOW_2005‐Adjoint for the definition of variables in the Layer Property Flow package. Parameters are a useful tool to represent aquifer properties in both codes and are the only option available in the adjoint version. Moreover, for overdetermined
D'ORIA, Marco, Fienen, Michael N.
openaire   +4 more sources

Effect of management strategies on reducing negative impacts of climate change on water resources of the Isfahan–Borkhar aquifer using MODFLOW

Rivers Research and Applications: an international journal devoted to river research and management, 2019
Recently, many studies have investigated the effect of climate change on groundwater resources in semiarid and arid areas and have shown adverse effects on groundwater recharge and water level.
Kaveh Ostad-Ali-Askari, H. G. Kharazi, M. Shayannejad, M. J. Zareian   +3 more
semanticscholar   +1 more source

Coupled Simulation of Xinanjiang Model with MODFLOW

Journal of Hydrologic Engineering, 2013
AbstractThis paper investigates the probability of integrating the Xinanjiang model, the most widely used watershed hydrological model in China, with the fully distributed groundwater model MODFLOW for processing a coupled flow simulation. Based on the flow simulation of the Xinanjiang and the SWAT model in the case study area, the correlation between ...
Li Zhijia, Zhang Xue-gang, Mao Yuan-yuan
openaire   +2 more sources

Regulation of shallow groundwater based on MODFLOW

Applied Geography, 2019
Abstract The relationship between shallow groundwater and vegetation growth is very close. Shallow groundwater can supply water for surface natural environments. The water table may offer an opportunity for or threat to land vegetation. Thus, fluctuation of the shallow groundwater should be managed to a reasonable range.
Yong Zhao, Fawen Li, Yang Liu, Rengui Jiang, Xiyuan Deng   +4 more
openaire   +2 more sources

Comparison of Local Grid Refinement Methods for MODFLOW

Groundwater, 2006
AbstractMany ground water modeling efforts use a finite‐difference method to solve the ground water flow equation, and many of these models require a relatively fine‐grid discretization to accurately represent the selected process in limited areas of interest.
Stanley A. Leake, Steffen Mehl, Mary C. Hill   +2 more
openaire   +3 more sources

Spatial Periodic Boundary Condition for MODFLOW

Groundwater, 2013
AbstractSmall‐scale hyporheic zone (HZ) models often use a spatial periodic boundary (SPB) pair to simulate an infinite repetition of bedforms. SPB's are common features of commercially available multiphysics modeling packages. MODFLOW's lack of this boundary type has precluded it from being effectively utilized in this area of HZ research.
Tariq Laattoe, Vincent E. A. Post, Adrian D. Werner   +2 more
openaire   +3 more sources

Evaluation of the MODFLOW‐2005 Conduit Flow Process

Groundwater, 2010
The recent development of the Conduit Flow Process (CFP) by the U.S. Geological Survey (USGS) provides hydrogeologic modelers with a new tool that incorporates the non‐Darcian, multiporosity components of flow characteristic of karst aquifers. CFP introduces new parameters extending beyond those of traditional Darcian groundwater flow codes.
Hill, Melissa E., Stewart, Mark T., Martin, Angel   +2 more
openaire   +4 more sources