The University of Massachusetts Amherst
University of Massachusetts Amherst

Search Google Appliance


Publications Library

Export 56 results:
Filters: Author is D. P. Ahlfeld  [Clear All Filters]
Journal Article
Ahlfeld D. P., Sawyer C.S.  1991.  Well location in capture zone design using simulation and optimization techniques. Groundwater. 28(4):507–512.
Ahlfeld D. P..  1990.   Two‐stage ground‐water remediation design. Journal of Water Resources Planning and Management. 116(4):517-529.
Kennedy MG, Ahlfeld D. P., Schmidt DP, Tobiason JE.  2006.  Three dimensional modeling for estimation of hydraulic retention time in a reservoir. Journal of Environmental Engineering. 132(9):976-984.
Ahlfeld D. P., Minihane M.  2004.  Storm flow from first-flush precipitation in stormwater design. Journal of Irrigation and Drainage Engineering. 130(4):269-276.
Ahlfeld D. P., Baro-Montes G.  2008.  Solving unconfined groundwater flow management problems with successive linear programming. Journal of Water Resources Planning and Management. 134(5):404-412.
Ahlfeld D. P., Zafirakou A., Riefler R.G.  1998.  Solution of the groundwater transport management problem by sequential relaxation. Advances in Water Resources. 21(7):591-604.
Ahlfeld D. P., Hill E.H.  1996.  The sensitivity of remedial strategies to design criteria. Groundwater. 34(2):341-348.
Riefler R.G, Smets B.F, Ahlfeld D. P..  1998.  Respirometric assay for biofilm kinetics estimation: parameter identifiability and retrievability. Biotechnology and Bioengineering. 57(1):35–45.
Pulido-Velazquez D, Ahlfeld D. P., Andreu J, Sahuquillo A.  2008.  Reducing the computational cost of unconfined groundwater flow in conjunctive-use models at basin scale assuming linear behaviour: The case of Adra-Campo de Dalías. Journal of Hydrology. 353(1-2):159-174.
Ahlfeld D. P., Sprong M.P.  1998.  Presence of nonconvexity in groundwater concentration response functions. Journal of Water Resources Planning and Management. 124(1):8-14.
Wang W, Ahlfeld D. P..  1994.  Optimal groundwater remediation with well location as a decision variable: model development. Water Resources Research. 30(5):1605–1618.
Ahlfeld D. P., Page R.H, Pinder G.F.  1995.  Optimal ground-water remediation methods applied to a superfund site: from formulation to implementation. Groundwater. 33(1):58–70.
Ahlfeld D. P..  2004.  Nonlinear response of streamflow to groundwater pumping for a hydrologic streamflow model. Advances in Water Resources. 27(4):349–360.
Ahlfeld D. P., Mulvey J.M, Dembo R.S, Zenios S.A.  1987.  Nonlinear programming on generalized networks. ACM Transactions on Mathematical Software. 13(4):350-367.
Mulligan A.E, Ahlfeld D. P..  2002.  A new interior-point boundary projection method for solving nonlinear groundwater pollution control problems. Operations Research. 50(4):636-644.
Tucciarelli T., Ahlfeld D. P..  1991.  A new formulation for transmissivity estimation with improved global convergence properties. Water Resource Research. 27(2):243–251.
Jeznach LC, Tobiason JE, Ahlfeld D. P..  2014.  Modeling conservative contaminant impacts on reservoir water quality. Journal American Water Works Association. 106(6):E295-E306.
Ji W., Dahmani A., Ahlfeld D. P., Lin J.D, Hill E..  1993.  Laboratory study of air sparging: air flow visualization. Groundwater Monitoring & Remediation. 13(4):115–126.
Adams R, Ahlfeld D. P., Sengupta A.  2007.  Investigating the potential for ongoing pollution from an abandoned pyrite mine. Mine Water and the Environment. 26(1):2-13.
Ahlfeld D. P..  1998.  Interpretation of the dual program for optimal groundwater hydraulic control. Journal of the American Water Resources Association. 34(1):195–206.
Ahlfeld D. P., Hoque Y.  2008.  Impact of simulation model solver performance on ground water management problems. Groundwater. 46(5):716-726.
Riefler R.G, Ahlfeld D. P..  1996.  The impact of numerical precision on the solution of confined and unconfined optimal hydraulic control problems. Hazardous Waste and Hazardous Materials. 13(2):167-176.
Ahlfeld D. P., Barlow PM, Mulligan AE.  2005.  GWM—A Ground–Water Management Process for the U.S. Geological Survey Modular Ground–Water Model (MODFLOW–2000). U.S. Geological Survey Open–File Report 2005–1072. :1-124.
Sawyer C.S, Ahlfeld D. P., King A.J.  1995.  Groundwater remediation design using a three-dimensional simulation model and mixed-integer programming. Water Resources Research. 31(5):1373–1385.
Jeznach LC, Jones C, Matthews T, Tobiason JE, Ahlfeld D. P..  2016.  A framework for modeling contaminant impacts on reservoir water quality. Journal of Hydrology. 537:322-333.
Ahlfeld D. P., Pinder G.F.  1992.  A fast and accurate method for solving subsurface contaminant transport problems with a single uncertain parameter. Advances in Water Resources. 15(2):143-150.
Ahlfeld D. P., Islam M.S.  1994.  Estimating the probability of exceeding groundwater quality standards. Journal of the American Water Resources Association. 30(4):623–629.
Towler B, Hoar A, Ahlfeld D. P..  2012.  Ecohydrology and fish passage engineering: Legacy of Denil and the call for a more inclusive paradigm. Journal of Water Resources Planning and Management. 138(2):77-79.
Ahlfeld D. P., Mulvey J.M, Pinder G.F.  1986.  Designing optimal strategies for contaminated groundwater remediation. Advances in Water Resources. 9(2):77-84.
Ahlfeld D. P., Mulvey J.M, Pinder G.F, Wood P.F.  1988.  Contaminated groundwater remediation design using simulation, optimization, and sensitivity theory: 1. Model development. Water Resources Research. 24(3):431–441.